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Yamagata Shuichi

Hokkaido University Hospital　OrthodonticsLecturer
Hokkaido University HospitalLecturer

Researcher basic information

■ Degree
  • 博士（歯学), 北海道大学
■ URL
researchmap URLホームページURL■ Various IDs
J-Global ID■ Research Keywords and Fields
Research Keyword
  • 歯科用材料・歯科理工学
  • 歯科矯正学
  • Dental Materials and Engineering(7405)
  • Orthodontics(7407)
Research Field
  • Life Science, Prosthodontics
  • Life Science, Developmental dentistry
■ Educational Organization

Career

■ Career
Career
  • Apr. 2025
    Hokkaido University Hospital, 講師
  • Apr. 2018
    Hokkaido University, Hokkaido University Hospital, 診療講師
  • Apr. 2007
    Hokkaido University, Graduate School of Dental Medicine, 助教
  • Jul. 1997 - Mar. 2007
    Hokkaido University, School of Dental Medicine, 助手
Educational Background
  • 1996, Hokkaido University, 歯学研究科, 歯学臨床系専攻, Japan
  • 1990, Hokkaido University, School of Dental Medicine, 歯学科, Japan
Committee Memberships
  • Mar. 2022 - Present
    日本矯正歯科学会, 研究倫理審査委員, Society
  • Jan. 2008 - Present
    北海道矯正歯科学会, 総務理事, Society
  • Apr. 2019 - Mar. 2022
    日本矯正歯科学会, 臨床・疫学研究倫理審査委員, Society
  • 2004 - 2021
    北海道大学病院, リスクマネージャー, Others
  • 2012 - 2014
    日本矯正歯科学会, 編集委員会 幹事, Society

Research activity information

■ Awards
  • Apr. 2025, The Japanese Society for Dental Materials and Devices, Best Paper Award
    Synthesis and evaluation of fluorescent resins with europium-β-diketonate complex for orthodontic use
    Shuichi YAMAGATA;Takaaki YAMAMOTO;Yoshiaki SATO;Tsukasa AKASAKA;Yasuhiro YOSHIDA, 40366199
  • Aug. 2018, Elsevier, Outstanding Reviewer Award
    Outstanding Contribution in Reviewing
    Shuichi Yamagata, Official journal
  • Apr. 2018, Elsevier, Outstanding Reviewer Award
    Outstanding Contribution in Reviewing
    Shuichi Yamagata, Official journal
  • Dec. 2016, Elsevier, Outstanding Reviewer Award
    Outstanding Contribution in Reviewing
    Shuichi Yamagata, Official journal
  • Jul. 2014, Elsevier, Outstanding Reviewer Award
    Outstanding Contribution in Reviewing
    Shuichi Yamagata, Official journal
  • Oct. 2012, The Japanese Orthodontic Society, The Excellent Presentation Award
    An examination of rare earth containing ZnO nano-particles by different calcination temperatures for fluorescent adhesives
    Yamagata S;Hamba Y;Nakanishi K;Yamamoto T;Sato Y;Iida J, Japan society, Japan
  • Apr. 2012, The Japanese Society for Dental Materials and Devices, Research Encouragement Prize
    An application of fluorescent matter to bonding materials
    Hamba Y;Yamagata S;Akasaka T;Uo M;Iida J;Watari F, Japan society, Japan
  • Oct. 2011, The Japanese Orthodontic Society, The Excellent Presentation Award
    An effectiveness of an octagonal wire for sliding mechanics
    Yamagata S;Hamba Y;Sato Y;Yamamoto T;Iida J, Japan society, Japan
■ Papers
  • Synthesis and evaluation of fluorescent resins with europium-β-diketonate complex for orthodontic use
    Shuichi YAMAGATA; Takaaki YAMAMOTO; Yoshiaki SATO; Tsukasa AKASAKA; Yasuhiro YOSHIDA
    Dental Materials Journal, 43, 4, 531, 538, Japanese Society for Dental Materials and Devices, 25 Jul. 2024, [Peer-reviewed], [Lead author, Corresponding author]
    Scientific journal, 40366199
  • Stability after mandibular setbacks and a novel evaluation method for the rotation of the distal segment
    Shuichi YAMAGATA; Takaaki YAMAMOTO; Yoshiaki SATO
    Journal of Hokkaido Orthodontic Society, 51, 1, 13, 20, Dec. 2023, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal
  • Different micro/nano-scale patterns of surface materials influence osteoclastogenesis and actin structure
    Tsukasa Akasaka; Miho Tamai; Yoshitaka Yoshimura; Natsumi Ushijima; Shinichiro Numamoto; Atsuro Yokoyama; Hirofumi Miyaji; Ryo Takata; Shuichi Yamagata; Yoshiaki Sato; Ko Nakanishi; Yasuhiro Yoshida
    NANO RESEARCH, 15, 5, 4201, 4211, Jan. 2022, [Peer-reviewed]
    English, Scientific journal
  • Fluorescence and mechanical properties of Y2O3:Eu3+ nanophosphor-containing adhesive resins
    Shuchi YAMAGATA; Takaaki YAMAMOTO; Yoshiaki SATO; Natsumi USHIJIMA; Tsukasa AKASAKA; Yasuhiro YOSHIDA
    Nano Biomedicine, 12, 1, 19, 26, Jun. 2020, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal, 12353451
  • Self-assembled monolayer formation on a dental orthodontic stainless steel wire surface to suppress metal ion elution
    Tamaki H; Abe S; Yamagata S; Yoshida Y; Sato Y
    coatongs, 10, 4, 367-1, 367-8, Apr. 2020, [Peer-reviewed]
    English, Scientific journal
  • Morphology and fluorescence of Y2O3:Eu3+ nanophosphors and dispersibility in adhesives resins
    Shuichi YAMAGATA; Takaaki YAMAMOTO; Yoshiaki SATO; Natsumi USHIJIMA; Tsukasa AKASAKA; Yasuhiro YOSHIDA
    Nano Biomedicine, 11, 2, 57, 64, Dec. 2019, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal, 12353451
  • Fabrication of light-curing type fluorescent orthodontic bonding materials using europium-β-diketonate complex
    Shuichi YAMAGATA; Takaaki YAMAMOTO; Yoshiaki SATO; Shigeaki ABE; Tsukasa AKASAKA; Yasuhiro YOSHIDA
    Nano Biomedicine, 10, 2, 53, 60, Dec. 2018, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal, 12353451
  • Fusion of RAW 264.7 macrophage cells on micro-scale fine pillar pattern
    Honma J; Akasaka T; Tamai M; Yoshimura Y; Taira T; Miyaji H; Yamagata S; Sato Y; Yoshida Y
    Digest Journal of Nanomaterials and Biostructures, 13, 4, 1123, 1131, Dec. 2018, [Peer-reviewed]
    English, Scientific journal
  • Optical and chromatic evaluation of fluorescent orthodontic bonding materials doped with a europium β-diketonate complex
    Aiko MATSUMOTO; Shuichi YAMAGATA; Shigeaki ABE; Tsukasa AKASAKA; Yasuhiro YOSHIDA; Junichiro IIDA
    Nano Biomedicine, 10, 1, 3, 8, Jun. 2018, [Peer-reviewed], [Corresponding author]
    English, Scientific journal, 12353451
  • Effect of a nano-scale fine hole pattern on the differentiation of RAW264.7 cells into osteoclasts
    Takata R; Akasaka T; Tamai M; Yoshimura Y; Taira T; Miyaji H; Tagawa Y; Yamagata S; Iida J; Yoshida Y
    Digest Journal of Nanomaterials and Biostructures, 13, 2, 451, 458, Jun. 2018, [Peer-reviewed]
    English, Scientific journal
  • Chemical modification to suppress metal ions elution of dental orthodontic wire surface
    Tamaki H; Tsuchiya S; Sakurada Y; Yamagata S; Hyono A; Kaneko K; Kawai K; Abe S; Yoshida Y; Iida J
    Molecular Crystals and Liquid Crystals, 660, 1, 163, 172, May 2018, [Peer-reviewed]
    English, Scientific journal
  • Electric Charge Dependence of Controlled Dye-Release Behavior in Glass Ionomer Cement Containing Nano-Porous Silica Particles
    Yosuke Bando; Ko Nakanishi; Shigeaki Abe; Shuichi Yamagata; Yasuhiro Yoshida; Junichiro Iida
    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 18, 1, 75, 79, Jan. 2018, [Peer-reviewed]
    English, Scientific journal
  • Y2O3:Eu3+ phosphors by homogeneous precipitation and subsequent calcination at varied temperatures for orthodontic adhesives
    Shuichi YAMAGATA; Takaaki YAMAMOTO; Yoshiaki SATO; Natsumi USHIJIMA; Shigeaki ABE; Tsukasa AKASAKA; Yasuhiro YOSHIDA; Junichiro IIDA
    Nano Biomedicine, 9, 1, 15, 22, National Institute of Informatics, Jun. 2017, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal, 11176017
  • Controlled ion release property of glass ionomer cement containing nanoporous silica particles
    K. Nakanishi; Y. Bando; T. Katsurayama; S. Morimoto; S. Abe; S. Yamagata; Y. Yoshida; J. Iida
    Key Engineering Materials, 720, 17, 20, Trans Tech Publications Ltd, 2017, [Peer-reviewed]
    English, International conference proceedings
  • Clinical statistics on orthodontic patients with impacted teeth at the orthodontic clinic of Hokkaido University Hospital
    Ikuno K; Sato Y; Yoshizawa S; Nakanishi K; Muto M; Miyakami Y; Kiyama N; Shoman K; Saito F; Sugawara Y; Iwasaki H; Kim T; Yamagata S; Kaneko T; Yamamoto T; Iida J
    The Journal of Hokkaido Orthodontic Society, 44, 1, 14, 20, Dec. 2016, [Peer-reviewed]
    English, Scientific journal
  • Development of Poly(L-lactic acid)/Organically Modified Montmorillonite Nanocomposites for the Fabrication of Orthodontic Anchoring Screws
    Ko Nakanishi; Shuichi Yamagata; Tsukasa Akasaka; Shigeaki Abe; Yasuhiro Yoshida; Junichiro Iida
    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 16, 9, 9292, 9297, Sep. 2016, [Peer-reviewed]
    English, Scientific journal
  • Evaluation of a gliding arc discharge non-thermal atmospheric pressure plasma device for orthodontic bonding
    Shuichi YAMAGATA; Takaaki YAMAMOTO; Yoshiaki SATO; Shigeaki ABE; Tsukasa AKASAKA; Yasuhiro YOSHIDA; Junichiro IIDA
    Nano Biomedicine, 8, 1, 57, 63, Jun. 2016, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal, 11176017
  • Evaluation of fluorescent orthodontic adhesives containing Y2O3:Eu3+ particles
    Shuichi YAMAGATA; Yoshiaki SATO; Takaaki YAMAMOTO; Shigeaki ABE; Tsukasa AKASAKA; Yasuhiro YOSHIDA; Junichiro IIDA
    Nano Biomedicine, 8, 1, 35, 40, Jun. 2016, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal, 11176017
  • Assessment of Size and Morphological Effects of Ceramics Nanoparticles on Their Biocompatibility
    Satoshi Tsuchiya; Shigeaki Abe; Yuko Era; Yukari Nakagawa; Shuichi Yamagata; Mariko Nakamura; Teruo Kusaka; Yasuhiro Yoshida; Tetsu Yonezawa; Junichiro Iida
    Nanoscience and Nanotechnology Letters, 8, 4, 329, 334, Apr. 2016, [Peer-reviewed]
    English, Scientific journal
  • Evaluation of the Biocompatibility of Ceramic Nanoparticles with A549 Lung Epithelial Cells
    Nozomu Kiyama; Shigeaki Abe; Shuichi Yamagata; Yasuhiro Yoshida; Junichiro Iida
    Nanoscience and Nanotechnology Letters, 8, 4, 310, 315, Apr. 2016, [Peer-reviewed]
    English, Scientific journal
  • Estimation of Biocompatibility of Nano-Sized Ceramic Particles with Osteoblasts, Osteosarcomas and Hepatocytes by Static and Time-Lapse Observation
    Shigeaki Abe; Eri Seitoku; Nobuki Lwadera; Yusuke Hamba; Shuichi Yamagata; Tsukasa Akasaka; Teruo Kusaka; Satoshi Lnoue; Yasutaka Yawaka; Junichiro Lida; Hidehiko Sano; Tetsu Yonezawa; Yasuhiro Yoshida
    JOURNAL OF BIOMEDICAL NANOTECHNOLOGY, 12, 3, 472, 480, Mar. 2016, [Peer-reviewed]
    English, Scientific journal
  • Effects of surface properties of montmorillonite for their cytocompatibility
    Ko Nakanishi; Shigeaki Abe; Shuichi Yamagata; Yasuhiro Yoshida; Junichiro Iida
    Key Engineering Materials, 696, 80, 84, Trans Tech Publications Ltd, 2016, [Peer-reviewed]
    English, International conference proceedings
  • Preparation of a poly(lactic acid)/montmorillonite nanocomposite
    Nakanishi K; Yamagata S; Akasaka T; Abe S; Yoshida Y; Iida J
    Key Engineering Materials, 631, 151, 155, 2015, [Peer-reviewed]
    English, International conference proceedings
  • Photophysical Properties and Biocompatibility of Photoluminescent Y2O3:Eu Nanoparticles in Polymethylmetacrylate Matrix
    Shigeaki Abe; Yusuke Hamba; Nobuki Iwadera; Shuichi Yamagata; Yasutaka Yawaka; Motohiro Uo; Junichiro Iida; Takayuki Kiba; Akihiro Murayama; Fumio Watari
    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 14, 4, 2891, 2894, Apr. 2014, [Peer-reviewed]
    English, Scientific journal
  • FRP esthetic orthodontic wire and development of matrix strengthening with poly(methyl methacrylate)/ montmorillonite nanocomposite
    Shuichi Yamagata; Junichiro Iida; Fumio Watari
    Handbook of Polymernanocomposites. Processing, Performance and Application: Volume A: Layered Silicates, 319, 328, Springer Berlin Heidelberg, 01 Jan. 2014, [Peer-reviewed], [Lead author, Corresponding author]
    English, In book
  • Preparation and biocompatibilities of luminescent europium-doped yttria and titania nanoparticles
    Shigeaki Abe; Yusuke Hamba; Atsushi Hyono; Shuichi Yamagata; Motohiro Uo; Junichiro Iida; Takayuki Kiba; Akihiro Murayama; Tsukasa Akasaka; Fumio Watari
    Journal of the Ceramic Society of Japan, 122, 1423, 216, 221, Ceramic Society of Japan, 2014, [Peer-reviewed]
    English, Scientific journal
  • Preparation and their biocompatibilities of luminescent Eu-doped nanoparticles
    Abe S; Hamba Y; Hyono A; Yamagata S; Uo M; Iida J; Kiba T; Maruyama A; Akasaka T; Watari F
    Journal of the Ceramic Society of Japan, 122, 3, 1, 6, 2014, [Peer-reviewed]
    English, Scientific journal
  • Dentistry Today - Novel innovation of materials and the consequent paradigm shift in the orthodontic practices -
    Yamagata S; Yamamoto T; Kaneko T; Sato Y; Iida J
    Hokkaido Journal of Dental Science, 34, 1, 18, 20, 北海道歯学会, Sep. 2013, [Lead author, Corresponding author]
    Japanese
  • Preparation and properties of Y2O3:Eu3+ particles-containing orthodontic adhesives
    Hamba Y; Yamagata S; Akasaka T; Uo M; Iida J; Watari F
    Nano Biomedicine, 5, 2, 75, 84, 2013, [Peer-reviewed]
    English, Scientific journal
  • An evaluation of fluorescent orthodontic adhesives containing Eu-doped ZnO at room temperature
    Yamagata S; Iwasaki H; Hamba Y; Nakanishi K; Ushijima N; Abe S; Akasaka T; Watari F; Iida J
    Nano Biomedicine, 5, 1, 31, 38, 2013, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal
  • Biocompatibility and biodistribution of several nano-sized ceramics particles
    Shigeaki Abe; Yusaku Hamba; Nobuki Iwadera; Tsukasa Akasaka; Shuichi Yamagata; Yasutaka Yawaka; Junichiro Iida; Motohiro Uo; Tetsu Yonezawa; Fumio Watari
    BIOCERAMICS 24, 529-530, 625, +, 2013, [Peer-reviewed]
    English, International conference proceedings
  • The effect of enhancing the hydrophobicity of OMMT on the characteristics of PMMA/OMMT nanocomposites
    Shuichi Yamagata; Yusuke Hamba; Tsukasa Akasaka; Natsumi Ushijima; Motohiro Uo; Junichiro Iida; Fumio Watari
    APPLIED SURFACE SCIENCE, 262, 56, 59, Dec. 2012, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal
  • An examination of rare-earth-element-containing ZnO nanoparticles by different calcination temperatures for fluorescent adhesives
    Yamagata S; Sato Y; Yamamoto T; Hamba Y; Nakanishi K; Iida J
    The Journal of Hokkaido Orthodontic Society, 40, 1, 1, 8, Hokkaido Orthodontic Society, 2012, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal, Making orthodontic adhesives visible is valuable for safe and complete removal of these adhesives after completion of orthodontic treatments using a multibracket appliance. In order to make orthodontic adhesives visible by irradiation with purple or near ultraviolet light, trivalent europium ions, which emit clear red fluorescence, were doped into the lattices of zinc oxides by a homogeneous precipitation method and subsequent calcination at 400℃ or 850℃. The primary crystals of the synthesized products, overall, were on the nanoscale. The fluorescence intensity of the ZnO:Eu^<3+> nanoparticle-containing polymer adhesives was somewhat weak. The spectra, independent of the calcination temperatures, exhibited characteristic peaks corresponding to the intrinsic 4f-4f transitions of Eu^<3+>. However, it is evident from the X-ray diffraction (XRD) patterns that the 850℃-calcination tended to crystallize more EU_2O_3, along with increased incorporation of Eu^<3+> ions into ZnO lattices, in comparison to the case with the 400℃-calcination. In addition, although the yielding load of the adhesives containing nanoparticles calcined at 850℃ decreased significantly, the decrease in the actual measured values was quite limited in both the cases. From a comprehensive standpoint, although the ZnO:Eu^<3+> nanoparticles calcined at 850℃ exhibited acceptable fluorescence intensity, the calcination at 400℃ is preferred for application to orthodontic adhesives.
  • Introduction of rare-earth-element-containing ZnO nanoparticles into orthodontic adhesives
    Yamagata S; Hamba Y; Nakanishi K; Abe S; Akasaka T; Ushijima N; Uo M; Iida J; Watari F
    Nano Biomedicine, 4, 1, 11, 17, 2012, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal
  • Questionnaire survey for using rubric and reflection in the basics of dental practice in orthodontics
    Sato Y; Iwasaki H; Yamagata S; Kusakabe T; Sugawara Y; Kim T; Kajii T; Kaneko T; Yamamoto T; Yoshimura M; Yawaka Y; Iida J
    Hokkaido Journal of Dental Science, 32, 1, 55, 61, 北海道歯学会, 2011, [Peer-reviewed]
    Japanese, Scientific journal
  • Trial introduction of rubric for the basics of dental practice in orthodontics
    Sato Y; Yamagata S; Iwasaki H; Kusakabe T; Sugawara Y; Kim T; Kajii T; Kaneko T; Yamamoto T; Yoshimura M; Yawaka Y; Iida J
    Hokkaido Journal of Dental Science, 32, 1, 46, 54, 北海道歯学会, 2011, [Peer-reviewed]
    Japanese, Scientific journal
  • Optical and Mechanical Properties of Poly (methyl methacrylate)/Montmorillonite Nanocomposites
    Yamagata S; Hamba Y; Akasaka T; Uo M; Iida J; Watari F
    Nano Biomedicine, 3, 1, 217, 223, Nano Biomedical Society, 2011, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal, Transparent poly (methyl methacrylate)/organically modified montmorillonite (PMMA/OMMT) nanocomposites were fabricated using a solution intercalation method. OMMT was modified with quaternary alkylammonium ions. The haze values, which are the ratios of diffuse transmittance to total light transmittance via the nanocomposites, gradually increased with an increasing amount of OMMT; however, the deterioration of total light transmittance was maintained within a narrow range. X-ray diffraction patterns showed that a peak regarded as a (001) d-spacing or a second peak corresponding to (002) plane was shifted toward lower 2θ values indicating the penetration of the PMMA polymer chains into the interlayer regions of OMMT. Board-shaped specimens used for the flexural tests were fabricated by compression molding at 230°C. The specimens were sufficiently transparent for their use as esthetic orthodontic wires. The flexural modulus of the PMMA/OMMT nanocomposites increased favorably with an increasing amount of OMMT. It is reasonable to consider that the addition of OMMT to the nanocomposites effectively improves the stiffness of PMMA without seriously deteriorating its flexibility.
  • Preparation and Properties of Thermoplastic-resin-based Nanocomposites for the Development of Esthetic Orthodontic Wires
    Yamagata S; Akasaka T; Uo M; Ushijima N; Nodasaka Y; Iida J; Watari F
    Nano Biomedicine, 1, 2, 151, 158, 2009, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal
  • Clinical and Statistical Analysis from Topographic Points on Cleft Lip and/or Palate Patients in Hokkaido University Hospital
    MATSUNO Mino; KAJII Takashi S; KADONO Akihiro; ALAM Mohammad Khursheed; SUGAWARA Yuki; OKAMOTO Toru; IWASAKI Hiroshi; YAMAGATA Shuichi; SATO Yoshiaki; IIDA Junichiro
    日本口蓋裂学会雑誌, 33, 3, 315, 321, Oct. 2008, [Peer-reviewed]
    Japanese
  • Effect of disinfectants to the dimensional stability of alginate impression materials
    Tanaka S; Yamamoto T; Suwa N; Kaneko T; Yamagata S; Uo M; Iida J
    The Journal of Hokkaido Orthodontic Society, 36, 1, 13, 20, Hokkaido Orthodontic Society, 2008, [Peer-reviewed]
    Japanese, Scientific journal, Recently, nosocomial infections of HBV, HCV, and HIV have become a concern, and the prevention of such infections for medical staff and patients based on standard precautions is important. Here the dimensional changes in alginate impressions after immersion in disinfectants and rinsing with water after disinfection was investigated. Experimental condition is as follows : Immersion in disinfectant test 1) Group D: in phtharal for 20 minutes. 2) Group SH: in 0.1% sodium hypochloride solution for 60 minutes. 3) Group W: in distilled water for 60 minutes. Disinfections-rinsing with water test 1) Group D-W : in distilled water for 30 minutes, after immersion in phtharal for 5 minutes. 2) Group SH-W: in distilled water for 30 minutes, after immersion in 0.1% sodium hypochloride solution for 60 minutes. There were 15 test pieces in each condition, and the test pieces were measured with a projector, and dimension change rates were calculated. The data were analyzed by one-way ANOVA and post hoc tests. The results may be summarized as follows. 1. The dimensional changes of Group D and Group SH were smaller than the changes of Group W. 2. The test pieces immersed in distilled water after immersion in disinfectants expanded immediately. 3. Therefore, impressions should be rinsed with water quickly after immersion in disinfectant, then next inject plaster into the impressions soonest possible.
  • A case of retrognathia treated with useful application of sequential individual operation of genioplasty and mandibular anterior subapical alveolar osteotomy during the presurgical orthodontic treatment
    Matsushita K; Yamaguchi H; Suwa N; Takamichi O; Yamamoto T; Yamagata S; Sato Y; Oda M; Ooi K; Donen M; Ohata N; Totsuka Y; Iida J; Inoue N
    The Japanese Journal of Jaw Deformities, 18, 3, 221, 229, (NPO)日本顎変形症学会, 2008, [Peer-reviewed]
    Japanese, Scientific journal, 35歳女。11歳時、埋伏していた両側上下顎第一小臼歯を抜歯し、15歳頃までマルチブラケットによる治療を受けた。17歳頃から下顎の後退を自覚したが放置した。咀嚼障害と口裂閉鎖困難が増強した。下顎後退(小下顎)症、両側上下顎第一小臼歯欠損と診断した。初めに、オトガイ形成術でオトガイ部を前方へ移動させ下顎基部を拡大し、オトガイの後方位を改善することにした。次いで、骨癒合を待って下顎前歯部の歯槽骨切り術で咬合平面に対する下顎前歯の唇側傾斜を改善し、術前矯正治療が終了した後に上下顎移動術を施行、さらに術後矯正治療を行う方針とした。骨体固定金属板撤去手術は上下顎移動術後13ヵ月目に行い、骨の癒合状態は良好であった。上下顎移動術の前までに歯軸の唇側傾斜は改善した。咬合平面に対する唇側傾斜は著明に改善した。オトガイの後方位も改善した。
  • A clinical and statistical study on the orthodontic patients at Hokkaido university hospital for the past 9 years
    Yamagata S; Sato Y; Yamamoto T; Iida J
    The Journal of Hokkaido Orthodontic Society, 35, 1, 25, 33, Hokkaido Orthodontic Society, 2007, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal, All patients who received an initial examination at Hokkaido University Hospital for the past 9 years were considered to be Sample 1, and the patients except for the referred patients were considered to be Sample 2. The findings about the statistical observation and the geographical characteristic of them were as follows : 1. The number of patients of Sample 1 and Sample 2 were 2,392 and 2,147. In Sample 1, the percentages of the patients with congenital anomalies and jaw deformities were 17.6% and 18.3% respectively. 2. In Sample 2, the ratio between males and females in the patients with congenital anomalies was 1:0.9, and the range of that in other groups was from 1:1.7 to 1:2. 3. In Sample 2, the 5-9 years-old patients were dominant in both gender groups, and the age layer of the male converged on younger and smaller range. However, the most frequent age layer in each group was various. 4. In Sample 2, the residence of most patients (87.7%) was distributed within a 50km radius. About 74.2% of the patients lived in Sapporo city. Some patients lived in 11 cities or towns distributed in a 200-300km radius. 5. Hokkaido University hospital does not contribute only for the medical care in the wide area but also has a characteristic as the local hospital.
  • Clinical practice as an undergraduate course of the dental hygienist student at the orthodontic clinic of the Hokkaido university hospital
    Sato Y; Kusakabe T; Okamoto T; Iwasaki H; Yamagata S; Yamamoto T; Iida J
    The Journal of Hokkaido Orthodontic Society, 35, 1, 18, 24, Hokkaido Orthodontic Society, 2007, [Peer-reviewed]
    Japanese, Scientific journal, The aim of this study was to evaluate the educational situation around clinical training of dental hygienist students at Hokkaido University Hospital. A questionnaire survey was conducted with a total of 41 dental hygienist students from three training institutions for dental hygienists who had completed of orthodontic clinical training. The questionnaire was aimed to analyze the status of the educational program and to identify problems in the educational situation at the clinic of the authors as an educational facility. The following points were established. (1) Over 85% of the students were aware of the General Instructional Objectives (GIO) before clinical training, and also checked these during the training. (2) Over 80% of the students considered that they achieved the GIO and that Hokkaido University Hospital had provided adequate educational programs. (3) Over 85% of the students thought that instruction was "Intelligible" or "Somewhat intelligible" and that teaching materials were adequate. (4) Comments by satisfied students included "studying from many cases", "detailed instructions from the staff", "instruction from their own teachers", and similar. Among the dissatisfied responses were "There are few chances to learn the service of hygienist as it actually takes place", "short training period", and similar. (5) About 30% of the students met with some risky situation during the training. (6) Over 80% students had zeal for their occupation after training, while the remaining had a negative image.
  • The incidence and etiology of open gingival embrasure after orthognathic treatment
    Haraguchi N; Sato Y; Okamoto T; Kusakabe T; Kajii T; Yamagata S; Yamamoto T; Ohata N; Inoue N; Iida J
    The Journal of Hokkaido Orthodontic Society, 32, 1, 8, 13, Hokkaido Orthodontic Society, 2004, [Peer-reviewed]
    Japanese, Scientific journal, The purpose of our study is to investigate the incidence of post-orthodontic open gingival embrasures (black triangles) and to examine the association with open gingival embrasure in patients who underwent orthodontic/surgical combined treatment. Twenty-four subjects were randomly chosen from patients diagnosed as skeletal Class III reversed occlusion in Hokkaido University Hospital Orthodontic clinic. The incidences of 5 gingival embrasures from canine to canine in lower dental arch were evaluated at initial examination, before surgery and at debonding. A sample was divided into two groups: normal gingival embrasure (group A) and open gingival embrasure (group B). The following variables were evaluated the association with open gingival embrasure : age, treatment duration, Curve of Spee, arch length discrepancy, inter-maxillary elastics, the amount of surgical counter-clock-wise rotation of the mandible, change in crown length and the distance of incisor movement. The following results were obtained. 1. 12 of 24 patients had the black triangles. 2. 9 of 24 patients had the black triangles at debonding. 3. There were no statistical differences between group A and B regarding with age, treatment duration, intermaxillary elastic, the amount of upward rotation of the mandibule at surgery. 4. The Curve of Spee in group A was deeper than group B and this was statistically significant. 5. Incisor in group A had longer crown than one in group B, this was also statistically significant. 6. Incisor in group A had been elongated greater than in group B, this was also statistically significant.
  • Static-dynamic friction transition of FRP esthetic orthodontic wires on various brackets by suspension-type friction test
    N Suwa; F Watari; S Yamagata; J Iida; M Kobayashi
    JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS, 67B, 2, 765, 771, Nov. 2003, [Peer-reviewed]
    English, Scientific journal
  • Investigation of accuracy in pre-surgical orthodontic treatment for establishment of an evidence-based critical pathway for orthodontic/surgical combined treatment
    Kitazawa S; Sato Y; Suwa N; Okamoto T; Kajii T; Yamazaki A; Toyoizumi H; Yamagata S; Yamamoto T; Ohata N; Inoue N; Iida J
    The Journal of Hokkaido Orthodontic Society, 31, 1, 21, 27, Hokkaido Orthodontic Society, 2003, [Peer-reviewed]
    Japanese, Scientific journal, A critical pathway helps to organize patient' s care and eliminates variations created by doctors' different experience. In order to establish a critical pathway for orthodontic/surgical combined treatment, we investigated the accuracy of pre-surgical orthodontic treatment concerning relationships between incisors, occlusal plane angle and amount of mandibular setback. The following results were obtained. As for the prediction of mandibular setback, the differences between before and after pre-surgical orthodontic treatment ranged from -2.7mm to +2.9 mm horizontally and from -5.9mm to +2.4 mm vertically. The differences between these two predictions of mandibular setback were evaluated by multiple regression analysis. The dependent variables were the horizontal and vertical differences in these predictions. The independent variables were the difference between the position of U1 predicted initially and the position after pre-surgical orthodontic treatment, the difference between positions of L1 and the difference between occlusal plane angles. The horizontal difference was related to the following variables : the horizontal difference of U1, the difference of occlusal plane angle, the horizontal and vertical differences of L1. The vertical difference was related to the vertical differences in U1 and the vertical differences in L1. The results suggest that attention should be given to the positions of the incisors, not only horizontally but also vertically, in order to perform mandibular setback as accurately as that predicted initially. Therefore, we should establish a critical pathway that enables evaluation of the positions of incisors during pre-surgical orthodontic treatment and improve the accuracy for the tooth movement.
  • An analytical study on the recognition of the facial midline by layperson
    Yamagata S; Yamamoto T; Iida J
    The Journal of Hokkaido Orthodontic Society, 31, 1, 11, 20, Hokkaido Orthodontic Society, 2003, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal, Coincidence in dental and facial midlines is one of the important goals of orthodontic treatment. However, there is no objective method for obtaining a facial midline. Moreover, the difference in recognition of a facial midline between orthodontists and laypersons is also uncertain. We defined a subjectively determined facial midline as an imaginary facial midline, and we clarified the setting mechanism of it by orthodontists. The purpose of this study is to analyze the difference in recognition of a facial midline between orthodontists and laypersons by conducting the same investigation to laypersons. 97 students of the faculty of liberal arts were chosen as the subject. They were instructed to find the middle point between two predetermined points (research 1) and to draw their own imaginary facial midline in photographs of two adult Japanese without obvious facial asymmetry (research 2). As a result of research 1, we found both groups recognized significantly accurate middle points if the distance was less than 60mm. From research 2, we also found that the standard method of both groups to set the imaginary facial midline was almost same. They both drew it as perpendicular as possible to relatively horizontal lines with attention to some points in the lower part of the nose and the upper lip, or just as an approximate line of those points.
  • A case of skeletal class II malocclusion with severe unilateral scissors bite
    Sato Y; Kusakabe T; Kajii T; Yamagata S; Yamamoto T; Imai T; Ueda Y; Okuda K; Takamichi O; Ohata N; Oda M; Yamaguchi H; Totsuka Y; Inoue N; Iida J
    The Japanese Journal of Jaw Deformities, 12, 1, 24, 32, (NPO)日本顎変形症学会, 2002, [Peer-reviewed]
    Japanese, Scientific journal, 初診時33歳8ヵ月女.左側臼歯部鋏状咬合及び下顎右側臼歯部欠損による咀嚼障害,口唇の突出による整容障害,ならびに口裂閉鎖困難を主訴に受診した.上顎左側臼歯部歯槽骨切り術と下顎左側歯槽皮質骨切り術を併用することで外科的矯正治療を行い,良好な治療結果が得られた
  • Development of arch form esthetic orthodontic wires by light polymerization
    Toyoizumi H; Watari F; Imai T; Kobayashi M; Yamagata S; Iida J
    The Journal of the Japanese Society for Dental Materials and Devices, 21, 5, 271, 277, The Japanese Society for Dental Materials and Devices (JSDMD), 2002, [Peer-reviewed]
    Japanese, Scientific journal
  • New appliance for anterior maxillary advancement and maxillary lateral expansion simultaneously – Application of distraction osteogenesis -
    Iwasaki H; Yamamoto T; Otaki N; Sato Y; Yamagata S; Toyoizumi H; Endo LS; Ohata N; Inoue N; Iida J
    The Journal of Hokkaido Orthodontic Society, 30, 1, 59, 65, Hokkaido Orthodontic Society, 2002, [Peer-reviewed]
    Japanese, Scientific journal
  • A retrospective analysis for establishment of the evidence-based critical pathway for an orthodontic/surgical combined treatment
    Sato Y; Takata K; Okamoto T; Kajii T; Yamazaki A; Toyoizumi H; Yamagata S; Yamamoto T; Ohata N; Inoue N; Iida J
    The Journal of Hokkaido Orthodontic Society, 30, 1, 46, 50, Hokkaido Orthodontic Society, 2002, [Peer-reviewed]
    Japanese, Scientific journal, The critical pathway helps to organize patient's care and eliminates variations created by doctors' different preference. In order to establish the critical pathway, we gathered and analyzed data focused on the length of the treatment in each step. The following results were obtained. 1. An average length of the treatment in each step was a. 1.8 mos from the initial examination to diagnosis b. 19.8 mos for the pre-surgical orthodontic treatment c. 5.0 mos for a jaw surgery including d. 11.0 mos for the post-surgical orthodontic treatment 2. The pre-surgical orthodontic treatment varied widely and took the longest time 3. The extraction cases (average; 22.0 mos) significantly needed longer time than the non-extraction cases (average; 16.7 mos) in the pre-surgical orthodontic period These data suggest that the application of the critical pathway to the pre-surgical orthodontic treatment would be more effective and two or more different critical pathways should be established for this period.
  • A study of orthodontic patients with metal allergy
    Irie J; Irie S; Yoshikawa M; Sugawara Y; Otaki N; Nagayama K; Yamagata S; Sato Y; Kaneko T; Iida J
    The Journal of Hokkaido Orthodontic Society, 30, 1, 34, 39, Hokkaido Orthodontic Society, 2002, [Peer-reviewed]
    Japanese, Scientific journal, A questionnaire survey was carried out to clarify the points regarding metal allergy that attention should be given to when treating orthodontic patients. The subjects were 7 orthodontic patients (1 male and 6 females; mean age, 21.3 years) who had been diagnosed as having metal allergies by patch tests. The following results were obtained. 1. Nickel was the most frequently identified metal showing a positive reaction in patch tests (in half of the patients). Since nickel is frequently used in orthodontic treatment, care should be taken over the selection of material when treating orthodontic patients with metal allergies. 2. All of the patients had other allergy symptoms. Thus, taking detailed histories may lead to the discovery of metal allergies in patients who are not aware of such allergies. 3. Four of the seven patients had symptoms of metal allergy caused by earrings and other such ornaments. Since many orthodontic patients are young women, taking detailed histories and conducting careful observations are important.
  • Application of distraction osteogenesis to anterior maxillary advancement
    Iwasaki H; Yamamoto T; Uga M; Matsuyama I; Sato Y; Yamagata S; Toyoizumi H; Endo LS; Ohata N; Inoue N; Iida J
    The Journal of Hokkaido Orthodontic Society, 30, 1, 1, 10, Hokkaido Orthodontic Society, 2002, [Peer-reviewed]
    Japanese, Scientific journal, In this study, the effects of treatment of anterior maxillary advancement using distraction osteogenesis were investigated. The subjects were three severe skeletal class III patients who needed surgical orthodontic treatment for mandibular retrusion (one female aged 16 years and 5 months of age, one female aged 28 years and 9 months, and one male and 26 years and 3 months at the initial examination). At the initial examination, extra-oral clinical examination revealed concave profiles and intra-oral examination revealed crowding in the upper arches in all patients. In presurgical orthodontic treatment of the maxilla, anterior maxillary advancement was performed using an intraoral appliance a palatal expansion screw from a few days after the maxillary osteotomy. Lateral expansion was performed simultaneously in one case. Anterior maxillary advancement was performed at a rate of 1 mm of advancement per day for seven to nine days. Data were obtained from maxillary dental casts, profile facial photographs and lateral cephalograms before and just after the completion of expansion. Just after the completion of expansion, the upper incisor edges had moved 4.8-9.1 mm anteriorly. In the patient whose palate was also expanded laterally, the inter-premolar width increased to 6.8 mm. It was found that SNA increased 3.51-5.12 degrees, SNB decreased 1.17-0.31 degrees, NSP-A increased 4.4-5.6 mm and U1-SN increased 7.10-11.17 degrees. Anterior maxillary advancement using distraction osteogenesis resulted in creation of sufficient space in the upper arches to cancel the arch length discrepancies in the upper arches. In addition, the concave facial profiles of all patients improved.
  • The development of the esthetic orthodontic wire
    Shuichi Yamagata; Junichiro Iida; Tohru Imai; Fumio Watari; Masahiro Kobayashi
    Zairyo to Kankyo/ Corrosion Engineering, 51, 12, 555, 560, Japan Society of Corrosion Engineering, 2002, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal
  • An analytical study on the recognition and the reactive behavior of patients to past injuries caused by fixed appliance
    Yamagata S; Yamamoto T; Iida J
    The Journal of Hokkaido Orthodontic Society, 30, 1, 51, 58, Hokkaido Orthodontic Society, 2002, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal, A questionnaire survey was carried out to determine the types of inconvenience felt in daily life due to oral injuries caused by fixed orthodontic appliances and to determine the percentages of orthodontic patients who feel such inconveniences and who visit emergency clinics for treatment of the oral injury as well as the relationship between these percentages. The subjects were 64 orthodontic patients who had been fitted with fixed appliances (male/female ratio, 1:3.6; mean age, 23.5±6.2 years; mean treatment period, 2.2±1.3 years). The following results were obtained: 1. There was a greater tendency in male patients than in female patients to either constantly feel inconveniences in daily life due to oral injury or to not feel any inconveniences at all. There was also a greater tendency in male patients than in female patients not to visit emergency clinics for treatment. 2. There appears to be a correlation between the feeling of inconvenience in daily life due to oral injury and visiting an emergency clinic for treatment. 3. The main factors causing the feeling of inconvenience in daily life were difficulty in speaking, irritation and pain. 4. More than half of the patients who did not visit emergency clinics for treatment of oral injury probably have negative or indifferent feelings regarding treatment for the oral injury.
  • A study of the discrepancy in upper and lower basal arch width related to inclination of the upper and molars in jaw deformity patients
    Sato Y; Yamagata S; Okamoto T; Yamamoto T; Imai T; Iida J; Ueda Y; Okuda K; Takamichi O; Ohata N; Oda M; Yamaguchi H; Totsuka Y; Inoue N
    The Japanese Journal of Jaw Deformities, 11, 1, 21, 28, (NPO)日本顎変形症学会, 2001, [Peer-reviewed]
    Japanese, Scientific journal
  • A case of skeletal class III malocclusion with severe open bite treated by combined Le Fort I and sagittal split ramus osteotomy
    Sato Y; Kajii T; Kusakabe T; Okamoto T; Yamagata S; Yamamoto T; Imai T; Iida J; Ohata N; Inoue N
    The Journal of Hokkaido Orthodontic Society, 29, 1, 50, 57, Hokkaido Orthodontic Society, 2001, [Peer-reviewed]
    English, Scientific journal
  • A new method for healing the oral mucosal injuries caused by fixed appliances
    Senshu Y; Yamagata S; Yamamoto T; Iida J
    The Journal of Hokkaido Orthodontic Society, 29, 1, 46, 49, Hokkaido Orthodontic Society, 2001, [Peer-reviewed]
    Japanese, Scientific journal, The aim of this study was to determine the utility of a new method for treating oral mucosal injuries caused by fixed appliances on the teeth. In this method,the space between the surface of a tooth and the wings of a bracket is filled using dental cement. The practicality of the new method was investigated by 1)observation of durability of cement in simulation tests on a mannequin used for dentistry training, 2) examination of the mechanical properties of dental cement, and 3)clinicai tests. Although a statistically significant difference was found between the compressive strengths of the two cements used in this study, the times required to fill a space with the cement and to remove the cement were the same. In simulation tests for clinical application, the average time was sufficiently short(about 10 seconds), and the time did not depend on clinical experience or the kind of cement. It was also found that injuries healed within a month after treatment using this method. The new method does not require special skill, special instruments and or special materials, and it can be performed quickly. The results confirmed that the cement used in this method has sufficient durability. Thus, the new method is effective for both prevention and treatment of oral mucosal injuries.
  • Prediction of mandibular position following correction of functional anterior crossbite
    Tobitsuka M; Yamamoto T; Iwasaki H; Toyoizumi H; Furuya T; Yamagata S; Kaneko T; Iida J
    The Journal of Hokkaido Orthodontic Society, 29, 1, 16, 23, Hokkaido Orthodontic Society, 2001, [Peer-reviewed]
    Japanese, Scientific journal, The purpose of this study is to predict the mandibular position following correction of functional anterior crossbite. Multiple regression analyses were carried out using data obtained from lateral cephalograms in the intercuspal and rest positions at the first examination and at an examination after correction of anterior crossbite in 19 patients. The following results were obtained. 1. For Δ SNB", a multiple regression equation (a multiple correlation coefficient : 0.76) was obtained when S・Pog-OP (Upper) , NF-MP, ANB and overbite were used as the explanatory variables. 2. For Δ B", a multiple regression equation (a multiple correlation coefficient : 0.87) was obtained when S・Pog-OP (Upper), ANB, NF-OP (Upper), Δ B (X)' and SNB were used as the explanatory variables. 3. For Δ B (X)", a multiple regression equation (a multiple correlation coefficient : 0.82) was obtained when S*Pog-OP (Upper) , ANB, NF-MP and Δ SNB' were used as the explanatory variables. 4. For Δ B (Y)", a multiple regression equation (a multiple correlation coefficient : 0.39) was obtained when overjet was used as the explanatory variable. The results suggested that it was possible to predict the degree of horizontal change in mandibular position following correction of functional anterior crossbite by the multiple regression equations obtained in this study.
  • An analytical study on the recognition of patients to past oral injuries caused by fixed appliance
    Yamagata S; Yamamoto T; Iida J
    The Journal of Hokkaido Orthodontic Society, 29, 1, 29, 36, Hokkaido Orthodontic Society, 2001, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal, In this study, the recognition to oral injuries in 73 orthodontic patients with fixed appliances (male : female ratio, 1 : 2.7 ; mean age, 23.5 ± 6.2 years ; mean treatment period, 2.2 ± 1.3 years ; mean overbite, 1.1 ± 3.1mm ; mean overjet 1.5 ± 5.2mm) was investigated to determine the relationships between their recognition and the following factors : gender ratio, age, treatment period, overbite, overjet and type of bracket. It was found that the factor that had the greatest effect on recognition was gender. Other factors, except for type of bracket, had little effect. It was also found that the patients could remember the types and the sites of past injuries. In addition, there was tendency to have abrasions in the more anterior segment and stab wounds in the more posterior segment of the dental arch. The results of this study also indicate that no factor alone was the direct cause of any of the injuries and that gender might affect to the recognition of injuries. These findings are of value not only for daily orthodontic practice but also for related and future studies.
  • A reinforcement method for retainer polymer using biocompatible glass cloth
    Yamagata S; Yamamoto T; Iida J; Kobayashi M
    The Journal of Hokkaido Orthodontic Society, 29, 1, 11, 15, Hokkaido Orthodontic Society, 2001, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal, Orthodontists sometimes experience cases of breakage of a retainer in the marginal area. The aim of this study was to determine whether the use of glass cloths improves the mechanical properties of polymer for retainers. The glass cloths were silanated before fabrication. All test specimens were 2 x 15 x 40 mm in size. The specimens were divided into three types according to the manner of containment of the glass cloth : without reinforcement (type 1), the cloth in the neutral zone (type 2) and the cloth on the surface (type 3). The results were as follows. 1. The elastic moduli of type 2 and 3 specimens were about 1.3- and 1.4-times larger than that of type 1 specimens, respectively. 2. The flexural strengths of type 2 and 3 specimens were about 1.4- and 1.7-times larger than that of type 1 specimens, respectively. Adequate improvement in transverse strength of the retainer polymer was accomplished simply by placing the glass cloth. This method using biocompatible glass cloth is a simple method for reinforcing resin and is thought to be effective for preventing breakage of retainers.
  • Bracket suitable for esthetic orthodontic wires
    Uga M; Watari F; Kobayashi M; Imai T; Yamagata S; Iida J
    The Journal of the Japanese Society for Dental Materials and Devices, 19, 6, 553, 564, The Japanese Society for Dental Materials and Devices (JSDMD), 2000, [Peer-reviewed]
    Japanese, Scientific journal, The purpose of this study was to evaluate the contribution of the new bracket design to the clinical application of esthetic fiber reinforced plastic orthodontic wires(FRP wire). Then, R 0 type only with an extended slot base and R 05, R 1 and R 2 with curvature, 0.5, 1.0 and 2.0 mm radius respectively, at the base were examined for the ability to avoid the shear force exerted by ligatures. The results of the cantilever breaking test showed that the limit of deflection of the FRP wire improved and that the larger radius was more effective. In the cantilever hysteresis test, FRP wires showed adequate elastic recovery, especially in the test with wires immersed in water. It was also clarified from ligated bending test that good elastic recovery and high load-retention could be obtained. From the results of this study, we suggest that the improved brackets would be useful in the clinical application of our FRP wires.
  • An analytical study on the acceptable range of pitching angle for proper frontal facial photo
    Okuda S; Yamagata S; Yamamoto T; Imai T; Iida J
    The Journal of Hokkaido Orthodontic Society, 28, 1, 35, 41, Hokkaido Orthodontic Society, 2000, [Peer-reviewed]
    Japanese, Scientific journal, Pitching, the sagittal rotation of the head, causes misrepresentation of a image in the frontal facial photo. Therefore, a certain standard should be established for pitching to obtain proper frontal photos for diagnosis. The purpose of this study was to determine the acceptable range of pitching angles. Linear measurements were carried out using frontal facial photos taken at every 2° angle from +20° to -20° to have a picture that could be regarded to be the same as that in the FH head position (0°). It was found that the lower facial width decreased proportionally with upward transfer of the angle. The upper facial height did not show any significant differences in the range of +12° to -12°. The decreasing rate of mid and total facial height was negligibly small from -20° to 0° but became significantly large from 0° to +20°. Lower facial height decreased proportionally with upward transfer of the angle. It was also found that the upper : mid : lower facial height ratio varied in each picture. On the basis of the results, the acceptable range of pitching angle was determined to be +2° to -2°.
  • An analytical study on visuognosis for cognition of the facial midline
    Yamagata S; Yamamoto T; Imai T; Iida J
    The Journal of Hokkaido Orthodontic Society, 28, 1, 20, 26, Hokkaido Orthodontic Society, 2000, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal, Coincidence in dental and facial midlines is one of the goals of orthodontic treatment. The setting of a facial midline is important to achieve this treatment goal. However, there is no objective method for obtaining a facial midline, and the difference between the cognizance of orthodontists and laypersons is also uncertain. It is therefore important to specify a comparatively accurate facial midline. We defined a subjectively defermined facial midline as an imaginary facial midline, and we tried to elucidate the mechanism of the setting. We tried to limit the areas or structures of a face that we thought to be involved in the setting of an imaginary facial midline. The subjects of this study, 34 orthodontists with 3 years or more experience, were instracted to draw their own imaginary facial midlines in facial photostats of two adult Japanese with facial symmetry. As a result, we found the standard way by which orthodontists set an imaginary facial midline. The standard method is to set the imaginary facial midline so that it is as perpendicular as possible to a relatively horizontal line with attention given to both or either the middle point of the alares and/or the bottom point of the cupid bow as signposts.
  • An analytical study on the ability of visuognosis for the middle point of one pair of facial structures
    Yamagata S; Yamamoto T; Imai T; Iida J
    The Journal of Hokkaido Orthodontic Society, 28, 1, 15, 19, Hokkaido Orthodontic Society, 2000, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal, It seems that a person recognizes the face of another person by subconsciously determining a subjective facial midline unconsciously. We have defined such a subjectively defermined facial midline as an imaginary facial midline. It appears to be important to understand the ability of human visuognosis of space in order to elucidate the setting mechanism of an imaginary facial midline. In this study, we tried to clarify the ability of visuognosis that is thought to be the setting of an imaginary facial midline, by investigating 34 orthodontists with 3 years or more experience. The results were as follows. 1. The abillities of visuognosis of the orthodontists with the experience over 3 years were eguivalent. 2. Only in the case of ΔX, both the displacement and the variance changed in proportion to the distance between 2 points. 3. The recognition of middle points was significantly accurate if the distance between the 2 points was less than 60 mm. The results of this study are thought to be applicable to human faces.
  • Effects of water immersion on mechanical properties of new esthetic orthodontic wire
    T Imai; F Watari; S Yamagata; M Kobayashi; K Nagayama; S Nakamura
    AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS, 116, 5, 533, 538, Nov. 1999, [Peer-reviewed]
    English, Scientific journal
  • Temperature-dependence of the Mechanical Properties of FRP Orthodontic Wire
    Tohru Imai; Shuichi Yamagata; Fumio Watari; Masahiro Kobayashi; Kazunori Nagayama; Hiroshi Toyoizumi; Masaru Uga; Shinji Nakamura
    Dental Materials Journal, 18, 2, 167, 175, Japanese Society for Dental Materials and Devices, 1999, [Peer-reviewed]
    English, Scientific journal
  • Fabrication of esthetic FRP wires with flexural and torsional properties for orthodontics
    Toyoizumi H; Watari F; Imai T; Yamagata S; Nagayama K; Uga M; Nakamura S; Kobayashi M
    Proceedings for Symposium on Advanced Research of Energy Technology, 319, 328, 1999, [Peer-reviewed]
    English, International conference proceedings
  • Fabrication of aesthetic wires with flexural and torsional stiffness by photo curing method
    Toyoizumi H; Watari F; Imai T; Yamagata S; Kobayashi M
    The Journal of the Japanese Society for Dental Materials and Devices, 18, 6, 429, 440, The Japanese Society for Dental Materials and Devices (JSDMD), 1999, [Peer-reviewed]
    Japanese, Scientific journal, To realize aesthetic othodontic wires, we have been developing the FRP wires in combination with biocompatible CaO-P_2O_5-SiO_2-Al_2O_3 (CPSA) glass fibers and PMMA matrix by a hot drawing method. These wires are mainly intended to be used for the movement of teeth during the initial stage of treatment. In this study, a photo cure polymerization method was applied to form the rectangular timber with a sufficient torque force for rotation of the teeth. The FRP wire composed of CPSA glass fibers and UDMA matrix showed a sufficient flexural strength. For torsional properties, however, the wire had a much smaller torque compared with that of Co-Cr and Ni-Ti wires. The FRP using dental composite resin for matrix showed a load 4 times of UDMA based FRP wires. The torsional load was increased to 1/2 of Ni-Ti wire. It was found that the fiber content mainly contributes to flexural load while the use of stiff materials such as composite resin for the matrix is much more effective for improving torsional properties.
  • The fabrication and properties of aesthetic FRP wires for use in orthodontics
    F Watari; S Yamagata; T Imai; S Nakamura; M Kobayashi
    JOURNAL OF MATERIALS SCIENCE, 33, 23, 5661, 5664, Dec. 1998, [Peer-reviewed]
    English, Scientific journal
  • Mechanical properties and aesthetics of FRP orthodontic wire fabricated by hot drawing
    T Imai; F Watari; S Yamagata; M Kobayashi; K Nagayama; Y Toyoizumi; S Nakamura
    BIOMATERIALS, 19, 23, 2195, 2200, Dec. 1998, [Peer-reviewed]
    English, Scientific journal
  • Dental compensation in skeletal Class III jaw relationship – Analysis of post treatment dental casts -
    Atsushi YAMAZAKI; Yoshiaki SATO; Shinichi KITAZAWA; Haruka TSUKADA; Yoshinori NODERA; Toyohisa KUSAKABE; Hiroshi IWASAKI; Shuichi YAMAGATA; Kazuhiro UMEDA; Keiichiro OKAZAKI; Hiroyuki ISHIKAWA; Shinji NAKAMURA
    The Journal of Hokkaido Orthodontic Society, 26, 1, 1, 9, Hokkaido Orthodontic Society, 1998, [Peer-reviewed]
    Japanese, Scientific journal, As far as the dental compensation with skeletal Class III jaw relationship is concerned, researches were carried out on the basis of the lateral cephalograms. However, it is often observed that cases with antero-posterior disharmony also have disharmony of the width of the dental arch. So we think that the dental compensation should not be investigated only by upper and lower incisor but also the lateral teeth. Especially, because canine is the place where curve of the dental arch is most strong, compensatory changes are considered to vary. In the present study dental compensation in treated cases with skeletal Class III jaw relationship was investigated both by model and cephalometric analysis. 1. When compared to Class I molar relationship cases, Class in molar relationship cases showed lingual inclination of lower incisor and distal inclination of lower canine in relation to the occlusal plane. Furthermore, in Class III molar relationship cases either labial inclination of upper canine or lingual inclination of lower canine was observed. 2. As the jaw relationship became worse, occlusal plane became flatter in Class I molar relationship group. But flattening of occlusal plane wasn't enough in Class III molar relationship group. So there was antero-posterior disharmony of upper and lower dental arch. 3. From the above, finally it can be concluded that the position of canine and the inclination of occlusal plane in the establishment of occlusion is an important parameter for diagnosis as well as treatment is concerned.
  • Effect of water immersion and surface treatment on esthetic orthodontic wires
    Kazunori NAGAYAMA; Fumio WATARI; Tohru IMAI; Shuichi YAMAGATA; Masahiro KOBAYASHI
    Hokkaido Journal of Dental Science, 19, 2, 197, 214, 1998, [Peer-reviewed]
    Japanese, Scientific journal
  • Comparison of the transformation pseudoelasticity of various Ti-Ni alloy archwire products
    Shuichi YAMAGATA; Hiroshi TOYOIZUMI; Hiroyuki ISHIKAWA; Fumio WATARI; Shinji NAKAMURA
    Hokkaido Journal of Dental Science, 19, 1, 70, 79, 1998, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal
  • A clinical study on the prediction of the sizes of unerupted canines and premolars in malocclusions
    Takeshi YAMAZAKI; Takuro UENO; Tomoo KANMEKO; Kazuhiro UMEDA; Osamu SUGIYAMA; Shuichi YAMAGATA; Eiji URAMOTO; Isao MATSUYAMA; Yoshiko YANAGI; Masatake YOSHIKAWA; Tohru IMAI; Shinji NAKAMURA
    The Journal of Hokkaido Orthodontic Society, 24, 1, 21, 27, Hokkaido Orthodontic Society, 1996, [Peer-reviewed]
    Japanese, Scientific journal
  • Properties of the unidimensionally glass fiber reinforced composite wire for an esthetic orthodontic wire
    Watari F; Kobayashi M; Yamagata S; Nagayama K; Imai T; Nakamura S
    Biomechanics, 9, 469, 472, 1996, [Peer-reviewed]
    English, Scientific journal
  • Structure and properties of the FRP esthetic orthodontic wire
    Watari F; Kobayashi M; Yamagata S; Nagayama K; Imai T; Nakamura S
    Proceedngs of International Conference on Microstructures and Functions of Materials, 141, 144, 1996, [Peer-reviewed]
    English, International conference proceedings
  • An experimental study of the development of an esthetic transparent orthodontic wire with fiber reinforced plastic structure
    Shuichi YAMAGATA; Tohru IMAI; Fumio WATARI
    Hokkaido University Hokkaido Journal of Dental Science, 16, 2, 225, 244, 1995, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Doctoral thesis
■ Other Activities and Achievements
■ Books and other publications
  • Handbook of Polymernanocomposites. Processing, Performance and Applications Volume A: Layered Silicates
    Yamagata S; Iida J; Watari F, FRP esthetic orthodontic wire and development of matrix strengthening with poly(methyl methacrylate)/montmorillonite nanocomposite
    Springer Berlin Heidelberg, Jan. 2014, 9783642386480, 538, 319-328, English, Scholarly book, [Contributor]
■ Lectures, oral presentations, etc.
  • Evaluation of photofading for the development of fluorescent bonding materials
    Shuichi Yamagata; Takaaki Yamamoto; Yoshiaki Sato
    The 84th Annual Meeting of the Japanese Orthodontic Society, 01 Oct. 2025, Japanese, Poster presentation
    29 Sep. 2025 - 01 Oct. 2025, 40366199
  • Study on the direction of eruption and treatment method of mandibular second premolar tooth germ
    Toko Yanagisawa; Nozomu Kiyama; Shuichi Yamagata; Takaaki Yamamoto; Yoshiaki Sato
    The 84th Annual Meeting of the Japanese Orthodontic Society, 01 Oct. 2025, Japanese, Poster presentation
    29 Sep. 2025 - 01 Oct. 2025
  • Re-evaluation of initially planned procedures just before surgery in Hokkaido University Hospital
    Saori Tsuchiya; Mami Mutoh; Takaaki Yamamoto; Shuichi Yamagata; Ko Nakanishi; Kazuhiro Matsushita; Osamu Takamichi; Yoshiaki Sato
    The 83rd Annual Meeting of the Japanese Orthodontic Society, 31 Oct. 2024, Japanese, Poster presentation
    29 Oct. 2024 - 31 Oct. 2024
  • Survey of dmft-index of jaw deformity patients at Hokkaido university hospital from 2013 to 2019
    Matsumura K; Nakanishi K; Mutoh M; Kasai M; Matsushita K; Yamagata S; Yamamoto T; Sato Y
    The 82nd Annual Meeting of the Japanese Orthodontic Society, 03 Nov. 2023, Japanese, Poster presentation
    01 Nov. 2023 - 03 Nov. 2023
  • Transition of root apex of mandibular incisors and canines during surgical orthodontic treatment
    Mutoh M; Yamamoto T; Nakanishi K; Matsushita K; Yamaguchi H; Takamichi O; Yamagata S; Sato Y
    The 32nd Annual Meeting of the Japanese Society for Jaw Deformities, 09 Jun. 2022, (NPO)日本顎変形症学会, Japanese, Poster presentation
    09 Jun. 2022 - 10 Jun. 2022
  • The study of mandibular second premolar tooth germ eruption direction
    Kiyama N; Yanagisawa T; Yamagata S; Yamamoto T; Sato Y
    The 80th Annual Meeting of the Japanese Orthodontic Society, 03 Nov. 2021, Japanese, Poster presentation
    03 Nov. 2021 - 05 Nov. 2021
  • Transition of root apex of maxillary central incisors and canines during surgical orthodontic treatment
    Mutoh M; Yamamoto T; Nakanishi K; Matsushita K; Yamaguchi H; Takamichi O; Yamagata S; Mikoya T; Sato Y
    The 31st Annual Meeting of the Japanese Society for Jaw Deformities, 11 Jun. 2021, (NPO)日本顎変形症学会, Japanese, Poster presentation
    11 Jun. 2021 - 12 Jun. 2021
  • Properties of novel urethane-based fluorescent bonding materials containing europium-β-diketonate complex
    Yamagata S; Yamamoto T; Yoshida Y; Sato Y
    The 9th International Orthodontic Congress (9th IOC), which was held in conjunction with the 79th Annual Meeting of the Japanese Orthodontic Society (79th JOS) and the 12th Asian Pacific Orthodontic Conference (12thAPOC), Oct. 2020, English, Poster presentation
    04 Oct. 2020 - 07 Oct. 2020, 12353451
  • Comparison of the ability of nanoporous silica to release antimicrobial agents depending on the pore size
    Endo R; Nakanishi K; Bando Y; Abe S; Yamagata S; Yoshida Y; Sato Y
    The 9th International Orthodontic Congress (9th IOC), which was held in conjunction with the 79th Annual Meeting of the Japanese Orthodontic Society (79th JOS) and the 12th Asian Pacific Orthodontic Conference (12thAPOC), Oct. 2020, English, Poster presentation
    04 Oct. 2020 - 07 Oct. 2020
  • A survey of segmental osteotomy performed in orthodontic patients
    Miyakami Y; Yamamoto T; Nakanishi K; Mutoh M; Harada S; Matsushita K; Yamaguchi H; Takamichi O; Yamagata S; Mikoya T; Sato Y
    The 30th Annual Meeting of the Japanese Society for Jaw Deformities, 24 Jun. 2020, (NPO)日本顎変形症学会, Japanese, Poster presentation
    24 Jun. 2020 - 09 Jul. 2020
  • Long term follow-up of skeletal mandibular protrusion patients performed sagittal split ramus osteotomy
    Nakanishi K; Yamamoto T; Mutoh M; Miyakami Y; Otsuka M; Harada S; Matsushita K; Yamaguchi H; Takamichi O; Yamagata S; Mikoya T; Sato Y
    The 30th Annual Meeting of the Japanese Society for Jaw Deformities, 24 Jun. 2020, (NPO)日本顎変形症学会, Japanese, Poster presentation
    24 Jun. 2020 - 09 Jul. 2020
  • Re-evaluation of initially planned procedures just before surgery - Part 3 -
    Mutoh M; Yamamoto T; Nakanishi K; Miyakami Y; Harada S; Matsushita K; Yamaguchi H; Takamichi O; Yamagata S; Mikoya T; Sato Y
    The 30th Annual Meeting of the Japanese Society for Jaw Deformities, 24 Jun. 2020, (NPO)日本顎変形症学会, Japanese, Poster presentation
    24 Jun. 2020 - 09 Jul. 2020
  • 矯正歯科治療へのグリコール変性ポリエチレンテレフタレートの新しい応用
    高田 亮; 山方秀一; 斉藤文男; 山本隆昭; 佐藤嘉晃
    第61回北海道矯正歯科学会総会・学術大会, 21 Jun. 2020, Japanese, Oral presentation
    21 Jun. 2020 - 21 Jun. 2020
  • Effect of particle and pore size of nano porous silica on ion release ability
    Endo R; Nakanishi K; Bando Y; Abe S; Yamagata S; Yoshida Y; Sato Y
    The 19th Asian BioCeramics Symposium (2019ABC), Dec. 2019, English, Poster presentation
    09 Dec. 2019 - 11 Dec. 2019
  • Assessment of results in jaw deformity patients with SARPE in Hokkaido University Hospital
    Yoshizawa S; Yamamoto T; Nakanishi K; Mutoh M; Yamaguchi H; Matsushita K; Yamagata S; Sato Y
    The 78th Annual Meeting of the Japanese Orthodontic Society, Nov. 2019, Japanese, Poster presentation
    20 Nov. 2019 - 22 Nov. 2019
  • Effect of ion release ability of hole size of nanoporous silica particles
    Endo R; Nakanishi K; Bando Y; Matsumoto A; Abe S; Yamagata S; Yoshida Y; Sato Y
    The 78th Annual Meeting of the Japanese Orthodontic Society, Nov. 2019, Japanese, Poster presentation
    20 Nov. 2019 - 22 Nov. 2019
  • Multifunctional surface modification on dental orthodontic wire surface: Suppression of metal ions elution and antibacterial property
    Tamaki H; Abe S; Yamagata S; Yoshida Y; Iida J; Sato Y
    The 17th International Nanotech Symposium & Exhibition (NANO KOREA 2019 Symposium), Jul. 2019, English, Poster presentation
    02 Jul. 2019 - 05 Jul. 2019
  • Re-evaluation of initially planed procedures just before surgery –Pert 2 width
    Mutoh M; Yamamoto T; Nakanishi K; Tsukamoto Y; Harada S; Matsushita K; Yamaguchi H; Takamichi O; Yamagata S; Sato Y; Mikoya T; Iida J
    The 29th Annual Meeting of the Japanese Society for Jaw Deformities, Jun. 2019, Japanese, Poster presentation
    08 Jun. 2019 - 09 Jun. 2019
  • Survey of dental-disease of jaw deformity patients more than 10 years after debonding
    Nakanishi K; Sato Y; Mutoh M; Endo R; Otsuka M; Harada S; Matsushita K; Yamaguchi H; Takamichi O; Yamagata S; Yamamoto T; Mikoya T; Iida J
    The 29th Annual Meeting of the Japanese Society for Jaw Deformities, Jun. 2019, Japanese, Oral presentation
    08 Jun. 2019 - 09 Jun. 2019
  • Effect of the micro/submicro-patterned COP film on cell behaviors
    Honma J; Akasaka T; Yamagata S; Sato Y; Yoshida Y
    The Hokkaido Association for Dental Science Meeting 2018, 01 Dec. 2018, Japanese, Oral presentation
    01 Dec. 2018 - 01 Dec. 2018
  • Effect of the micro/nano scale fine patterned film on periodontium-related cells behaviors
    Takata R; Akasaka T; Yamagata S; Sato Y; Yoshida Y
    The Hokkaido Association for Dental Science Meeting 2018, 01 Dec. 2018, Japanese, Oral presentation
    01 Dec. 2018 - 01 Dec. 2018
  • Chemical modification on dental orthodontic wire surface for suppression of metal ions elution and antibacterial property
    Tamaki H; Tsuchiya S; Abe S; Yamagata S; Yoshida Y; Iida J
    28th International Conference and Expo on Nanosciences and Nanotechnology, Nov. 2018, English, Poster presentation
    26 Nov. 2018 - 28 Nov. 2018
  • Chemical modification to suppress metal ions elution of dental orthodontic wire surface
    Tamaki H; Abe S; Yamagata Y; Sato Y; Iida J; Yoshida Y
    The 77th Annual Meeting of the Japanese Orthodontic Society, Oct. 2018, the Japanese Orthodontic Society, Japanese, Poster presentation
    Yokohama (Japan), [Domestic Conference]
  • Effect of the micro/nano scale fine patterned film on cell attachment
    Takata R; Akasaka T; Yamagata Y; Sato Y; Iida J; Yoshida Y
    The 77th Annual Meeting of the Japanese Orthodontic Society, Oct. 2018, the Japanese Orthodontic Society, Japanese, Poster presentation
    Yokohama (Japan), [Domestic Conference]
  • Fabrication of the fluorescent orthodontic bonding material using a europium complex
    Yamagata S; Sato Y; Abe S; Akasaka T; Yoshida Y
    The 72nd General Session of the Japanese Society for Dental Materials and Devices, Oct. 2018, the Japanese Society for Dental Materials and Devices, Japanese, Poster presentation
    Sapporo (Japan), 12353451, [Domestic Conference]
  • Development of novel multi-functional glass ionomer cement using nano-porous silica
    Bando Y; Nakanishi K; Abe S; Yamagata S; Yoshida Y; Iida J
    The 96th General Session & Exhibition of the IADR, which was held in conjunction with the IADR Pan European Regional Congress, Jul. 2018, International Association for Dental Research, English, Poster presentation
    London (England), [International presentation]
  • Drug sustain-relaease property of glass ionomer cement containing nano-porous silica
    Nakanishi K; Bando Y; Abe S; Yamagata S; Yoshida Y; Iida J
    The 96th General Session & Exhibition of the IADR, which was held in conjunction with the IADR Pan European Regional Congress, Jul. 2018, International Association for Dental Research, English, Poster presentation
    London (England), [International presentation]
  • ナノ多孔質シリカを用いた新規多機能性グラスアイオノマーセメントの開発
    坂東 洋祐; 中西 康; 山方 秀一; 飯田 順一郎; 阿部 薫明; 吉田 靖弘
    北海道外科雑誌, Jun. 2018, 北海道外科学会, Japanese
    Jun. 2018 - Jun. 2018
  • Survey of dental-disease of jaw deformity patients at Hokkaido University Hospital
    Matsumura K; Sato Y; Nakanishi K; Mutoh M; Harada S; Matsushita K; Yamaguchi H; Yuge F; Takamichi O; Yamagata S; Yamamoto T; Mikoya T; Iida J
    The 28th Annual Meeting of the Japanese Society for Jaw Deformities, Jun. 2018, the Japanese Society for Jaw Deformities, Japanese, Poster presentation
    Osaka (Japan), [Domestic Conference]
  • Survey of dental-disease of mandibular prognathism patients diagnosed as jaw deformity at Hokkaido University Hospital
    Nakanishi K; Sato Y; Matsumura K; Mutoh M; Harada S; Matsushita K; Yamaguchi H; Yuge F; Takamichi O; Yamagata S; Yamamoto T; Mikoya T; Iida J
    The 28th Annual Meeting of the Japanese Society for Jaw Deformities, Jun. 2018, the Japanese Society for Jaw Deformities, Japanese, Poster presentation
    Osaka (Japan), [Domestic Conference]
  • Re-evaluation of initially planned procedures just before surgery —from an orthodontic aspect—
    Mutoh M; Yamamoto T; Nakanishi K; Matsumura K; Yuge F; Takamichi O; Yamagata S; Sato Y; Iida J
    The 28th Annual Meeting of the Japanese Society for Jaw Deformities, Jun. 2018, the Japanese Society for Jaw Deformities, Japanese, Oral presentation
    Osaka (Japan), [Domestic Conference]
  • マイクロナノパターン構造を付与したCOP filmによる細胞接着への影響について
    本間 淳; 赤坂 司; 山方秀一; 佐藤嘉晃; 吉田靖弘
    2018年日本バイオマテリアル学会北海道ブロック第3回研究会, May 2018, 日本バイオマテリアル学会, Japanese, Poster presentation
    札幌市, [Domestic Conference]
  • Development of novel multi-functional glass ionomer cement using nanoporous silica
    Bando Y; Nakanishi K; Abe S; Hasebe A; Yamagata S; Yoshida Y; Shibata K; Iida J
    The Hokkaido Association for Dental Science Meeting 2017, 02 Dec. 2017, The Hokkaido Association for Dental Science, Japanese, Oral presentation
    Sapporo (Japan), [Domestic Conference]
  • Chemical modification on orthodontic stainless steel wires for suppression of metal ions
    Tsuchiya S; Abe S; Yamagata S; Yoshida Y; Iida J
    The 76th Annual Meeting of the Japanese Orthodontic Society, 20 Oct. 2017, (公社)日本矯正歯科学会, Japanese, Poster presentation
    18 Oct. 2017 - 20 Oct. 2017
  • Effect of surface charge of nanoporous silica particles for controlling ion capture and release
    Nakanishi K; Abe S; Bando Y; Yamagata S; Yoshida Y; Iida J
    29th Symposium and Annual Meeting of the International Society for Ceramics in Medicine (BIOCERAMICS 29), Oct. 2017, the International Society for Ceramics in Medicine, English, Poster presentation
    Toulouse (France), [International presentation]
  • A study of asymptomatic congenitally missing teeth of more than 6 teeth in orthodontic patients
    Hikone A; Mutoh M; Nakamura T; Tabata C; Kiyama N; Miyakami Y; Yoshizawa S; Uemura K; Tsuchiya S; Kim T; Iwasaki H; Yamagata S; Sato Y; Iida J
    The 76th Annual Meeting of the Japanese Orthodontic Society, Oct. 2017, The Japanese Orthodontic Society, Japanese, Poster presentation
    Sapporo, Japan, [Domestic Conference]
  • Optical and chromatic evaluation of europium complex doped fluorescent orthodontic bonding materials
    Matsumoto A; Yamagata S; Sato Y; Yamamoto T; Iida J
    The 76th Annual Meeting of the Japanese Orthodontic Society, Oct. 2017, The Japanese Orthodontic Society, Japanese, Poster presentation
    Sapporo, Japan, [Domestic Conference]
  • 新規歯科矯正用アンカースクリュー開発に向けたポリ乳酸/モンモリロナイトナノコンポジットの研究
    中西康; 山方秀一; 赤坂司; 阿部薫明; 佐藤嘉晃; 吉田靖弘; 飯田順一郎
    9th World Implant Orthodontic Conference (WIOC 2017) ・ 59th Annual Meeting of the Kinki-Tokai Orthodontic Society, Jul. 2017, Japanese, Poster presentation
    神戸国際会議場（神戸市）, [International presentation]
  • マイクロ・ナノ構造を持つG-PETフィルムにおける骨芽細胞様細胞の接着
    高田 亮; 赤坂 司; 山方秀一; 飯田順一郎; 吉田靖弘
    2017年日本バイオマテリアル学会北海道ブロック第2回研究会, May 2017, Japanese, Poster presentation
    [Domestic Conference]
  • マイクロナノグルーブを持ったCOP FILM上でのヒト歯根膜線維芽細胞の動態について
    本間 淳; 赤坂 司; 山方秀一; 飯田順一郎; 吉田靖弘
    2017年日本バイオマテリアル学会北海道ブロック第2回研究会, May 2017, Japanese, Poster presentation
    [Domestic Conference]
  • A selective cation uptake/release system using nano-porous silica
    Bando Y; Nakanishi K; Abe S; Yamagata S; Yoshida Y; Iida J
    The 16th Asian BioCeramic Symposium (ABC2016), Dec. 2016, English, Poster presentation
    [International presentation]
  • Chemical modification on orthodontic stainless steel wires for suppressing elution of metal ions
    Tsuchiya S; Abe S; Yamagata S; Yoshida Y; Iida J
    The Hokkaido Association for Dental Science Meeting 2016, Nov. 2016, Japanese, Oral presentation
    [Domestic Conference]
  • Evaluation of ion release ability of glass ionomer cement containing nanoporous silica particles
    Nakanishi K; Bando Y; Abe S; Yamagata S; Yoshida Y; Iida J
    The 75th Annual Meeting of the Japanese Orthodontic Society, Nov. 2016, Japanese, Poster presentation
    [Domestic Conference]
  • Cytocompatibility of photoluminescence ceramic nanoparticles
    Kiyama N; Abe S; Yamagata S; Yoshida Y; Iida J
    The 75th Annual Meeting of the Japanese Orthodontic Society, Nov. 2016, Japanese, Poster presentation
    [Domestic Conference]
  • Controlled ion release property of glass ionomer cement containing nanoporous silica particles
    Nakanishi K; Bando Y; Katsurayama T; Morimoto S; Abe S; Yamagata S; Yoshida Y; Iida J
    The 28th Symposium and Annual Meeting of the International Society for Ceramics in Medicine (BIOCERAMICS 28), Oct. 2016, English, Poster presentation
    [International presentation]
  • 北海道大学病院矯正歯科来院患者の埋伏歯に関する臨床統計
    生野啓一郎; 吉沢早織; 中西 康; 木山 望; 正満健斗; 宮上雄希; 武藤麻未; 菅原由紀; 金 壮律; 山方秀一; 金子知生; 佐藤嘉晃; 飯田順一郎
    第57回北海道矯正歯科学会総会・学術大会, Jun. 2016, Japanese, Oral presentation
    [Domestic Conference]
  • Evaluation of cytocompatibility of montmorillonite for novel dental materials
    Nakanishi K; Abe S; Bando Y; Yamagata S; Yoshida Y; Iida J
    The 67th General Session of the Japanese Society for Dental Materials and Devices, Apr. 2016, Japanese, Poster presentation
    Fukuoka (Japan), [Domestic Conference]
  • Do Silver－Russell syndrome and Beckwith－Wiedemann syndrome have opposite craniofacial morphology and occlusion?
    Sato Y; Fukushima K; Ohtsuka M; Ikeda M; Atsuta M; Yamazaki Y; Saito F; Sugawara-Kato Y; Kim T; Iwasaki H; Yamagata S; Kaneko T; Yamamoto T; Iida J
    The 74th Annual Meeting of the Japanese Orthodontic Society, Nov. 2015, English, Poster presentation
    Fukuoka City, [Domestic Conference]
  • Effects of surface property of montmorillonite for their cytocompatibility
    Nakanishi K; Abe S; Yamagata S; Yoshida Y; Iida J
    The 27th Symposium and Annual Meeting of the International Society for Ceramics in Medicine (BIOCERAMICS 27), Oct. 2015, International Society for Ceramics in Medicine, English, Poster presentation
    Bali, Indonesia, [International presentation]
  • 北海道大学病院を受診したRussel-Silver症候群患者の特徴
    山崎与志紀; 佐藤嘉晃; 熱田結香; 大塚麻衣; 福島久夢; 山方秀一; 金子知生; 山本隆昭; 三古谷忠; 小山明彦; 飯田順一郎
    第56回北海道矯正歯科学会総会・学術大会, Jun. 2015, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • Preparation of a poly(lactic acid)/montmorillonite nanocomposite
    Nakanishi K; Yamagata S; Akasaka T; Abe S; Yoshida Y; Iida J
    The 26th Symposium and Annual Meeting of the International Society for Ceramics in Medicine (BIOCERAMICS 26), Nov. 2014, International Society for Ceramics in Medicine, English, Poster presentation
    Barcelona, Spain, [International presentation]
  • 4級アルキルアンモニウムを用いて有機化処理したモンモリロナイトの細胞毒性評価
    中西 康; 山方秀一; 阿部薫明; 赤坂司; 吉田康弘; 飯田順一郎
    第57回日本口腔科学会中部地方部会, Oct. 2014, 日本口腔科学会中部地方部会, Japanese, Oral presentation
    津市, [Domestic Conference]
  • 北海道大学病院歯科診療センターについて―顎変形症カンファレンスについて―
    山本隆昭; 山方秀一; 佐藤嘉晃; 飯田順一郎; 山口博雄; 松下和裕; 三古谷忠; 高道理
    第55回北海道矯正歯科学会総会・学術大会, Jun. 2014, 北海道矯正歯科学会, Japanese, Nominated symposium
    札幌市, [Domestic Conference]
  • 対金属ダイレクトボンディングへの大気圧プラズマの応用
    山方秀一; 宮西華子; 木山望; 山本隆昭; 佐藤嘉晃; 飯田順一郎
    第55回北海道矯正歯科学会総会・学術大会, Jun. 2014, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • Clinical survey of jaw deformities over 15 years in Hokkaido university hospital Part 2
    Shibata K; Yamamoto T; Yamagata S; Sato Y; Kobori Y; Kaneko M; Matsushita K; Yamaguchi H; Yuge F; Takamichi O; Tei K; Mikoya T; Iida J
    The 24th annual meeting of the Japanese society for jaw deformities, Jun. 2014, Japanese society for jaw deformities, Japanese, Oral presentation
    Fukuoka, Japan, [Domestic Conference]
  • Cytocompatibility of nano-sized ceramic particles
    Abe S; Iwadera N; Hamba Y; Yamagata S; Akasaka T; Yawaka Y; Iida J; Watari F
    The 63rd General Session of the Japanese Society for Dental Materials and Devices, 13 Apr. 2014, (一社)日本歯科理工学会, Japanese, Poster presentation
    12 Apr. 2014 - 13 Apr. 2014
  • Influence of micro/nano materials on osteoblast-like cells
    Abe S; Iwadera N; Hamba Y; Yamagata S; Akasaka T; Yawaka Y; Iida J; Watari F
    The 62nd General Session of the Japanese Society for Dental Materials and Devices, Oct. 2013, Japanese Society for Dental Materials and Devices, Japanese, Poster presentation
    Niigata, Japan, [Domestic Conference]
  • Preparation of a poly lactic acid/layered silicate nanocomposite for using as a dental material
    Nakanishi K; Yamagata S; Hamba Y; Akasaka T; Watari F; Iida J
    The 62nd General Session of the Japanese Society for Dental Materials and Devices, Oct. 2013, Japanese Society for Dental Materials and Devices, Japanese, Poster presentation
    Niigata, Japan, [Domestic Conference]
  • An application of europium complex for developing fluorescence orthodontic bonding materials
    Hamba Y; Yamagata S; Nakanishi K; Akasaka T; Iida J; Watari F
    The 72nd annual meeting of the Japanese orthodontic society, Oct. 2013, Japanese orthodontic society, Japanese, Poster presentation
    Matsumoto, Japan, [Domestic Conference]
  • A development of fluorescent orthodontic adhesives containing Eu-doped ZnO
    Yamagata S; Hamba Y; Yamamoto T; Sato Y; Iida J
    The 89th congress of the European orthodontic society, Jun. 2013, European orthodontic society, English, Poster presentation
    Reykjavik, Iceland, [International presentation]
  • Clinical survey of jaw deformities over 15 years in Hokkaido university hospital
    Shibata K; Yamamoto T; Yamagata S; Sato Y; Iida J
    The 23rd annual meeting of the Japanese society for jaw deformities, Jun. 2013, Japanese society for jaw deformities, Japanese, Oral presentation
    Osaka, Japan, [Domestic Conference]
  • 骨接合材を用いた歯列の遠心移動歯有効か？
    佐藤嘉晃; 日下部豊寿; 斉藤文男; 山方秀一; 飯田順一郎
    第54回北海道矯正歯科学会総会・学術大会, Jun. 2013, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 北海道大学歯科診療センターにおける骨接合材の治療結果
    斉藤文男; 佐藤嘉晃; 日下部豊寿; 山方秀一; 飯田順一郎
    第54回北海道矯正歯科学会総会・学術大会, Jun. 2013, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 骨接合材を固定源として用いた症例の臨床統計
    日下部豊寿; 佐藤嘉晃; 斉藤文男; 山方秀一; 金子知生; 山本隆昭; 飯田順一郎
    第54回北海道矯正歯科学会総会・学術大会, Jun. 2013, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • Improvement of visibility of fluorescence bonding materials for orthodontics
    Hamba Y; Yamagata S; Akasaka T; Uo M; Iida J; Watari F
    The 61st General Session of the Japanese Society for Dental Materials and Devices, Apr. 2013, Japanese Society for Dental Materials and Devices, Japanese, Poster presentation
    Tokyo, Japan, [Domestic Conference]
  • Characteristic evaluation of dental bonding materials with fluorescence properties
    Hamba Y; Yamagata S; Akasaka T; Uo M; Iida J; Watari F
    The 60th General Session of the Japanese Society for Dental Materials and Devices, Oct. 2012, Japanese Society for Dental Materials and Devices, Japanese, Oral presentation
    Fukuoka, Japan, [Domestic Conference]
  • An examination of rare earth containing ZnO nano-particles by different calcination temperatures for fluorescent adhesives
    Yamagata S; Hamba Y; Nakanishi K; Yamamoto T; Sato Y; Iida J
    The 71st annual meeting of the Japanese orthodontic society, Sep. 2012, Japanese orthodontic society, Japanese, Poster presentation
    Morioka, Japan, [Domestic Conference]
  • 下顎前歯歯槽部骨延長術と上下顎骨切り術を応用した上顎前突症例
    佐藤 嘉晃; 山本 隆昭; 山方 秀一; 高道 理; 大畑 昇; 松下 和裕; 山口 博雄; 井上 農夫男; 飯田 順一郎
    第22回日本顎変形症学会総会・学術大会, 18 Jun. 2012, (NPO)日本顎変形症学会, Japanese, Poster presentation
    18 Jun. 2012 - 19 Jun. 2012
  • 前歯部開咬を伴った下顎後退症の術後の安定性 II. 術後の形態的変化
    山本隆昭; 山方秀一; 佐藤嘉晃; 飯田順一郎
    第22回日本顎変形症学会総会・学術大会, Jun. 2012, 日本顎変形症学会, Japanese, Oral presentation
    福岡市, [Domestic Conference]
  • Introduction of rare-earth-element-containing ZnO nanoparticles into orthodontic adhesives
    Yamagata S; Hamba Y; Nakanishi K; Yamamoto T; Sato Y; Iida J
    The 53th annual meeting of the Hokkaido orthodontic society, Jun. 2012, Hokkaido orthodontic society, Japanese, Oral presentation
    Sapporo, Japan, [Domestic Conference]
  • An application of fluorescent matter to bonding materials
    Hamba Y; Yamagata S; Akasaka T; Uo M; Iida J; Watari F
    The 59th General Session of the Japanese Society for Dental Materials and Devices, Apr. 2012, Japanese Society for Dental Materials and Devices, Japanese, Poster presentation
    Tokushima, [Domestic Conference]
  • An effectiveness of an octagonal wire for sliding mechanics
    Yamagata S; Hamba Y; Sato Y; Yamamoto T; Iida J
    The 4th international congress and the 70th annual meeting of the Japanese orthodontic society, Oct. 2011, Japanese orthodontic society, Japanese, Poster presentation
    Nagoya, [Domestic Conference]
  • An effect of polarity of organically modified montmorillonite on characteristics of PMMA/montmorillonite nanocomposites
    Yamagata S; Hamba Y; Akasaka T; Uo M; Iida J; Watari F
    The 3rd International Symposium on Surface and Interface of Biomaterials (SIB2011) in conjunction with The 5th Annual Meeting of the Nano Biomedical Society, Jul. 2011, The Nano Biomedical Society, English, Poster presentation
    Sapporo, Japan, [International presentation]
  • 顔面非対称症例に対する上下顎移動術施行後の変化についてⅡ：顔貌の変化
    和田悟史; 山本隆昭; 山方秀一; 佐藤嘉晃; 飯田順一郎
    第21回日本顎変形症学会総会・学術大会・30周年記念国際シンポジウム, Jun. 2011, 日本顎変形症学会, Japanese, Oral presentation
    東京都, [Domestic Conference]
  • Optical and Mechanical Properties of Poly (methyl methacrylate)/Montmorillonite Nanocomposites
    Yamagata S; Akasaka T; Uo M; Iida J; Watari F
    The International Dental Materials Congress 2011, May 2011, The Korea research society for dental materials, and the Japanese society for dental materials and devices, English, Poster presentation
    Seoul, Korea, [International presentation]
  • Effects of MMT fraction on the mechanical properties of PMMA/MMT nanocomposites
    Yamagata S; Sato Y; Yamamoto T; Watari F; Iida J
    The 69th annual meeting of the Japanese orthodontic society, Sep. 2010, Japanese orthodontic society, Japanese, Poster presentation
    Yokohama, [Domestic Conference]
  • 外科的に上顎歯槽基底部を拡大した症例の咬合安定性
    佐藤嘉晃; 山方秀一; 山本隆昭; 高道理; 大畑昇; 松下和裕; 山口博雄; 井上農夫男; 飯田順一郎
    第20回日本顎変形症学会総会・学術大会, Jun. 2010, 日本顎変形症学会, Japanese, Poster presentation
    札幌市, [Domestic Conference]
  • 上下顎歯列弓幅径の不調和に対する2分割Le FortⅠ型骨切り術 Ⅱ―上顎骨幅径と下顎位の安定について―
    諏訪伸輔; 山本隆昭; 山方秀一; 佐藤嘉晃; 飯田順一郎
    第20回日本顎変形症学会総会・学術大会, Jun. 2010, 日本顎変形症学会, Japanese, Nominated symposium
    札幌市, [Domestic Conference]
  • Preparation and properties of thermoplastic resin based nanocomposites for the development of FRP orthodontic wires
    Yamagata S; Akasaka T; Uo M; Iida J; Watari F
    The 54th General Session of the Japanese Society for Dental Materials and Devices, Oct. 2009, The Japanese society for dental materials and devices, Japanese, Poster presentation
    Kagoshima, [Domestic Conference]
  • 矯正器具の腐蝕と防蝕に関する検討
    諏訪伸輔; 佐藤嘉晃; 金子知生; 山方秀一; 日下部豊寿; 宇尾基弘; 飯田順一郎
    第50回北海道矯正歯科学会総会・学術大会, Jun. 2009, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • ジェットウォッシャーによる洗浄がピンカッターに与える影響について
    山本隆昭; 田中聡; 諏訪伸輔; 山方秀一; 金子知生; 飯田順一郎
    第50回北海道矯正歯科学会総会・学術大会, Jun. 2009, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 分割Le Fort I型骨切り術実施症例の安定性Ⅱ―2分割拡大症例について―
    諏訪伸輔; 山本隆昭; 山方秀一; 田中聡; 佐藤嘉晃; 飯田順一郎
    第19回日本顎変形症学会総会・学術大会, Jun. 2009, 日本顎変形症学会, Japanese, Oral presentation
    仙台市, [Domestic Conference]
  • 北海道大学病院歯科診療センターにおける上顎の位置決めについて
    山本隆昭; 山方秀一; 田中聡; 諏訪信輔; 佐藤嘉晃; 高道理; 大畑昇; 大井一浩; 松下和裕; 山口博雄; 戸塚靖則; 井上農夫男; 飯田順一郎
    第18回日本顎変形症学会総会・学術大会, Jun. 2008, 日本顎変形症学会, Japanese, Poster presentation
    名古屋市, [Domestic Conference]
  • 術前矯正治療期間におけるヴァリアンスについて
    佐藤嘉晃; 山本隆昭; 山方秀一; 田中聡; 諏訪伸輔; 山口博雄; 松下和裕; 高道理; 大畑昇; 井上農夫男; 飯田順一郎
    第18回日本顎変形症学会総会・学術大会, Jun. 2008, 日本顎変形症学会, Japanese, Poster presentation
    名古屋市, [Domestic Conference]
  • 下顎枝矢状分割術を行った回転角度の大きい開咬症例の術後安定性Ⅱ―下顎骨の回転と術後の歯系の補償―
    廣澤知之; 山本隆昭; 山方秀一; 諏訪伸輔; 田中聡; 佐藤嘉晃; 飯田順一郎
    第18回日本顎変形症学会総会・学術大会, Jun. 2008, 日本顎変形症学会, Japanese, Oral presentation
    名古屋市, [Domestic Conference]
  • 成長のコントロールにもかかわらず外科的矯正治療に移行した骨格性下顎前突症例
    諏訪伸輔; 佐藤嘉晃; 田中聡; 山方秀一; 山本隆昭; 飯田順一郎
    第49回北海道矯正歯科学会総会・学術大会, Jun. 2008, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • アルジネート印象材用消毒液の寸法精度への影響
    田中聡; 山本隆昭; 諏訪伸輔; 金子知生; 山方秀一; 飯田順一郎
    第49回北海道矯正歯科学会総会・学術大会, Jun. 2008, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • Profile changes by adult female orthodontic treatment in Hokkaido University Hospital
    Sato Y; Kusakabe T; Endo LS; Alam MK; Yamagata S; Iida J
    The 66th annual meeting of the Japanese orthodontic society, Sep. 2007, Japanese orthodontic society, Japanese, Oral presentation
    Osaka, [Domestic Conference]
  • Clinical and statistical analysis on congenital disease patients in Hokkaido University Hospital -Geographical consideration-
    Yamagata S; Sato Y; Tamamoto T; Kajii T; Iida J
    The 66th annual meeting of the Japanese orthodontic society, Sep. 2007, Japanese orthodontic society, Japanese, Poster presentation
    Osaka, [Domestic Conference]
  • オトガイ形成術と歯槽骨切り術を併用し、下顎前歯唇側傾斜を改善した下顎後退症例 Ⅱ ―矯正治療中における形態評価―
    諏訪信輔; 山本隆昭; 山方秀一; 豊泉裕; 佐藤嘉晃; 飯田順一郎
    第17回日本顎変形症学会総会, Jun. 2007, Japanese, Oral presentation
    [Domestic Conference]
  • 骨格性下顎前突の外科的矯正治療における下顎前歯のdecompensationについて
    佐藤嘉晃; 角野晃大; 菅原由紀; 梶井貴史; 岡本亨; 山方秀一; 山本隆昭; 山口博雄; 井上農夫男; 飯田順一郎
    第48回北海道矯正歯科学会総会・学術大会, Jun. 2007, Japanese, Oral presentation
    [Domestic Conference]
  • Geographical investigation on the distribution of the orthodontic patients in Hokkaido University Hospital
    Yamagata S; Ooya W; Sato Y; Yamamoto T; Iida J
    65th Annual Meeting of the Japanese Orthodontic Society and 1st Joint Meeting of the Japanese Orthodontic Society and the Korean Association of Orthodontists, Sep. 2006, English, Poster presentation
    [Domestic Conference]
  • 顎変形症患者における下顎骨側方偏位に関する検討
    和田悟史; 山本隆昭; 山方秀一; 田中聡; 諏訪伸輔; 豊泉裕; 佐藤嘉晃; 飯田順一郎; 尾田充孝; 山口博雄; 戸塚靖則; 高道理; 大畑昇; 井上農夫男
    第16回日本顎変形症学会総会・学術大会, Jun. 2006, 日本顎変形症学会, Japanese, Oral presentation
    千葉市, [Domestic Conference]
  • 北海道大学における顎変形症患者の変遷
    山方秀一; 佐藤嘉晃; 山本隆昭; 諏訪伸輔; 豊泉裕; 尾田充孝; 山口博雄; 高道理; 大畑昇; 戸塚靖則; 飯田順一郎; 井上農夫男
    第16回日本顎変形症学会総会・学術大会, Jun. 2006, 日本顎変形症学会, Japanese, Oral presentation
    千葉市, [Domestic Conference]
  • 歯科衛生士受託実習生に対する臨床教育に関する一考察
    佐藤嘉晃; 日下部豊寿; 岡本亨; 山方秀一; 山本隆昭; 飯田順一郎
    第47回北海道矯正歯科学会総会・学術大会, Jun. 2006, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 唇顎口蓋裂を有する患者の口腔衛生指導について
    前澤かおる; 佐藤嘉晃; 山方秀一; 岡本亨; 坂口登子; 飯田順一郎
    第46回北海道矯正歯科学会総会・学術大会, Jun. 2005, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • リテーナー洗浄剤が蝋着部位に及ぼす影響について
    杉山治; 金子知生; 山方秀一; 山本隆昭
    第46回北海道矯正歯科学会総会・学術大会, Jun. 2005, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 遠位骨片の位置を表す計測項目の創案とそのモニター画面上での計測精度
    山方秀一; 山本隆昭; 佐藤嘉晃; 豊泉裕; 諏訪伸輔; 田中聡; 安東真毅; 高道理; 大畑昇; 尾田充孝; 山口博雄; 戸塚靖則; 井上農夫男; 飯田順一郎
    第15回日本顎変形症学会総会・学術大会, Jun. 2005, 日本顎変形症学会, Japanese, Oral presentation
    徳島市, [Domestic Conference]
  • 下顎枝矢状分割術を行った症例の術後安定性Ⅰ‐下顎骨の回転量と移動量について‐
    田中聡; 山本隆昭; 佐藤嘉晃; 山方秀一; 豊泉裕; 山崎篤; 諏訪伸輔; 安東真毅; 飯田順一郎
    第15回日本顎変形症学会総会・学術大会, Jun. 2005, 日本顎変形症学会, Japanese, Oral presentation
    徳島市, [Domestic Conference]
  • 外科的矯正治療後の臨床歯冠長変化とブラックトライアングルの出現について
    原口直子; 佐藤嘉晃; 豊泉裕; 梶井貴史; 岡本亨; 日下部豊寿; 山方秀一; 山本隆昭; 大畑昇; 井上農夫男; 飯田順一郎
    第45回北海道矯正歯科学会総会・学術大会, Jun. 2004, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 分割Le Fort Ⅰ型骨切り術実施症例の検討Ⅰ‐術前矯正治療における問題点‐
    諏訪伸輔; 山本隆昭; 佐藤嘉晃; 山方秀一; 豊泉裕山崎篤; 高木洋美; 飯田順一郎
    第14回日本顎変形症学会総会・学術大会, May 2004, 日本顎変形症学会, Japanese, Oral presentation
    福岡市, [Domestic Conference]
  • Prediction of the amount of mandibular reposition following the correction of functional anterior crossbite
    Tobitsuka M; Yamamoto T; Iwasaki H; Kajii T; Toyoizumi H; Yamagata S; Kaneko T; Iida J
    The 62nd annual meeting of the Japanese orthodontic society, Oct. 2003, the Japanese orthodontic society, Japanese, Poster presentation
    Niigata (Japan), [Domestic Conference]
  • 上顎歯列弓の狭窄を伴う骨格性下顎前突症例‐上顎の3分割と下顎枝矢状分割術の適用‐
    佐藤嘉晃; 豊泉裕; 山方秀一; 山本隆昭; 飯田順一郎; 奥田耕一; 高道理; 上田康夫; 大畑昇; 尾田充孝; 山口博雄; 戸塚靖則; 井上農夫男
    第13回日本顎変形症学会総会・学術大会, Jun. 2003, 日本顎変形症学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 著しい片側性鋏状咬合を有する自閉症患者の1例
    豊泉 裕; 佐藤嘉晃; 山方秀一; 山本隆昭; 飯田順一郎; 上田康夫; 奥田耕一; 高道理; 大畑昇; 尾田充孝; 山口博雄; 戸塚靖則; 井上農夫男
    第13回日本顎変形症学会総会・学術大会, Jun. 2003, 日本顎変形症学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • Team approach for skeletal malocclusion with facial asymmetry using two-jaw surgery – Part 1
    Takagi H; Toyoizumi H; Yamamoto T; Yamagata S; Sato Y; Yamazaki A; Iida J
    The 13th Annual Meeting of the Japanese Society for Jaw Deformities, Jun. 2003, the Japanese Society for Jaw Deformities, Japanese, Oral presentation
    Sapporo (Japan), [Domestic Conference]
  • 外科的矯正治療へのクリティカルパス導入に関する研究 第二報 術前矯正治療における精度の検討
    北澤慎一; 佐藤嘉晃; 諏訪伸輔; 高田賢二; 岡本亨; 梶井貴史; 山崎篤; 豊泉裕; 山方秀一; 山本隆昭; 大畑昇; 井上農夫男; 飯田順一郎
    第44回北海道矯正歯科学会大会総会・学術大会, Jun. 2003, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • Examination of factors affecting on the flexural rupture of FRP orthodontic wire under wet conditions
    Tanaka S; Yamagata S; Uga M; Suwa N; Iida J; Uo M; Ohkawa S; Sugawara T; Watari F; Kobayashi M
    The 41st General Session of the Japanese Society for Dental Materials and Devices, Apr. 2003, Japanese Society for Dental Materials and Devices, Japanese, Oral presentation
    Tokyo, Japan, [Domestic Conference]
  • Application of distraction osteogenesis to palatal forward expansion
    Iwasaki H; Yamamoto T; Uga M; Ootaki N; Matsuyama I; Sato Y; Yamagata S; Toyoizumi H; Iida J
    The 61st annual meeting of the Japanese orthodontic society, Oct. 2002, (公社)日本矯正歯科学会, Japanese, Poster presentation
    Oct. 2002 - Oct. 2002
  • The morphological facial features of jaw deformity patients and their awareness
    Sato Y; Kajii T; Kajii S; Okamoto T; Yamagata S; Yamamoto T; Iida J
    The 61st annual meeting of the Japanese orthodontic society, Oct. 2002, the Japanese orthodontic society, Japanese, Poster presentation
    Oct. 2002 - Oct. 2002, Nagoya (Japan), [Domestic Conference]
  • Unilateral hemimandibular elongationの調査
    佐藤嘉晃; 梶井貴史; 日下部豊寿; 岡本亨; 豊泉裕; 山方秀一; 山本隆昭; 飯田順一郎; 上田康夫; 奥田耕一; 高道理; 大畑昇; 尾田充孝; 山口博雄; 戸塚靖則; 井上農夫男
    第12回日本顎変形症学会総会・学術大会, Jul. 2002, 日本顎変形症学会, Japanese, Oral presentation
    大阪市, [Domestic Conference]
  • 下顎骨前方移動術後の安定性Ⅰ‐形態的変化について‐
    豊泉裕; 山本隆昭; 山方秀一; 佐藤嘉晃; 山崎篤; 飯田順一郎
    第12回日本顎変形症学会総会・学術大会, Jul. 2002, 日本顎変形症学会, Japanese, Oral presentation
    大阪市, [Domestic Conference]
  • 外科的矯正治療に対するクリティカルパスの導入に関する予備調査
    佐藤嘉晃; 高田賢二; 岡本亨; 梶井貴史; 山崎篤; 豊泉裕; 山方秀一; 山本隆昭; 飯田順一郎
    第43回北海道矯正歯科学会総会・学術大会, Jun. 2002, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 金属アレルギーをもつ矯正患者に対する調査
    入江丈元; 入江幸保; 菅原由紀; 大瀧尚子; 由川将丈; 永山和典; 山方秀一; 佐藤嘉晃; 金子知生; 飯田順一郎
    第43回北海道矯正歯科学会総会・学術大会, Jun. 2002, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 骨延長法を応用した上顎歯列弓拡大
    岩崎弘志; 山本隆昭; 宇賀大; 松山功; 佐藤嘉晃; 山方秀一; 豊泉裕; 飯田順一郎
    第43回北海道矯正歯科学会総会・学術大会, Jun. 2002, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • Dependence of time on the flexural action of orthodontic wire
    Tanaka S; Yamagata S; Uga M; Suwa N; Iida J; Uo M; Ohkawa S; Sugawara S; Watari F; Kobayashi M
    The 39th General Session of the Japanese Society for Dental Materials and Devices, Apr. 2002, the Japanese Society for Dental Materials and Devices, Japanese, Oral presentation
    Tokyo (Japan), [Domestic Conference]
  • Suspension type friction test of FRP aesthetic orthodontic wires on brackets
    Suwa N; Yamagata S; Nagayama K; Toyoizumi H; Uga M; Iida J; Watari F; Kobayashi M
    60th Annual Meeting and 3rd International Congress of the Japanese Orthodontic Society, Oct. 2001, Japanese Orthodontic Society, English, Poster presentation
    Tokyo, Japan, [International presentation]
  • Examination of factors affecting on the flexural rupture of FRP orthodontic wire
    Tanaka S; Yamagata S; Uga M; Suwa N; Iida J; Uo M; Ohkawa S; Sugawara S; Watari F; Kobayashi M
    The 38th General Session of the Japanese Society for Dental Materials and Devices, Oct. 2001, the Japanese Society for Dental Materials and Devices, Japanese, Oral presentation
    Fukuoka (Japan), [Domestic Conference]
  • 顎変形症患者における上顎基底骨幅径に関する検討
    佐藤 嘉晃; 山方 秀一; 日下部 豊寿; 岡本 亨; 山本 隆昭; 飯田 順一郎; 上田 康夫; 奥田 耕一; 高道 理; 大畑 昇
    日本顎変形症学会雑誌, Aug. 2001, (NPO)日本顎変形症学会, Japanese
    Aug. 2001 - Aug. 2001
  • Bracket Designed for the Use of Esthetic Orthodontic Wires
    Uga M; Watari F; Kobayashi M; Yamagata S; Suwa N; Iida J
    The 79th General Session and Exhibition of the international association for dental research (IADR), Jun. 2001, International Association for dental research (IADR), English, Poster presentation
    Chiba, Japan, [International presentation]
  • 機能的前方位を伴う前歯部反対咬合症例における被蓋改善時下顎位の予測
    飛塚昌則; 山本隆昭; 岩崎弘志; 豊泉裕; 古谷忠典; 山方秀一; 金子知生; 飯田順一郎
    第42回北海道矯正歯科学会総会・学術大会, Jun. 2001, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • マルチブラケット装置による粘膜損傷を緩快させるための臨床的一考察
    千秋宜之; 山方秀一; 佐藤嘉晃; 山本隆昭; 飯田順一郎
    第42回北海道矯正歯科学会総会・学術大会, Jun. 2001, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 下顎枝垂直骨切り術後の安定性Ⅰ‐形態的変化‐
    豊泉裕; 山本隆昭; 山崎篤; 古谷忠典; 日下部豊寿; 山方秀一; 佐藤嘉晃; 飯田順一郎
    第11回日本顎変形症学会総会・学術大会, May 2001, 日本顎変形症学会, Japanese, Oral presentation
    東京都, [Domestic Conference]
  • Surgically assisted rapid palatal expansionの評価
    山崎 篤; 佐藤嘉晃; 豊泉裕; 日下部豊寿; 山方秀一; 山本隆昭; 飯田順一郎; 奥田耕一; 高道理; 大畑昇; 栗橋可織; 尾田充孝; 山口博雄; 戸塚靖則; 井上農夫男
    第11回日本顎変形症学会総会・学術大会, May 2001, 日本顎変形症学会, Japanese, Oral presentation
    東京都, [Domestic Conference]
  • 各種矯正ワイヤーとブラケットスロット内面との摩擦特性
    諏訪伸輔; 山方秀一; 永山和典; 豊泉裕; 飯田順一郎; 近藤清一郎; 大川昭治; 宇尾基弘; 菅原敏; 亘理文夫; 小林雅博
    第37回日本歯科理工学会学術講演会, Apr. 2001, 日本歯科理工学会, Japanese, Oral presentation
    東京都, [Domestic Conference]
  • Bracket shape suitable for esthetic orthodontic wires
    Uga M; Yamagata S; Imai T; Iida J; Watari F; Kobayashi M
    The 59th annual meeting of the Japanese orthodontic society, Oct. 2000, the Japanese orthodontic society, Japanese, Poster presentation
    Osaka (Japan), [Domestic Conference]
  • Suspensional friction test of FRP esthetic orthodontic wires on brackets and ligature wires
    Suwa N; Yamagata S; Nagayama K; Toyoizumi H; Imai T; Iida J; Kondo S; Ohkawa S; Uo M; Sugawara S; Watari F; Kobayashi M
    The 36th General Session of the Japanese Society for Dental Materials and Devices, Oct. 2000, the Japanese Society for Dental Materials and Devices, Japanese, Oral presentation
    Kurashiki (Japan), [Domestic Conference]
  • A biocompatible glass cloth for reinforcement of polymer retainers
    Yamagata S; Imai T; Iida J; Kobayashi M
    The 76th Congress of the European Orthodontic Society, Jun. 2000, European Orthodontic Society, English, Poster presentation
    Hersonissos, Greece, [International presentation]
  • Mechanical properties of aesthetic fiber reinforced plastic rectangular archwire
    Imai T; Toyoizumi H; Yamagata S; Nagayama K; Yamamoto T; Iida J; Nakamura S; Watari F; Kobayashi M
    The 76th Congress of the European Orthodontic Society, Jun. 2000, European Orthodontic Society, English, Poster presentation
    Hersonissos, Greece, [International presentation]
  • 正貌写真撮影時に許容される頭部の矢状面回転量
    奥田薫之; 山方秀一; 飛塚昌則; 山本隆昭; 今井徹; 飯田順一郎
    第41回北海道矯正歯科学会総会・学術大会, Jun. 2000, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 顔面正中の認識に関する解析
    山方秀一; 山本隆昭; 今井徹; 飯田順一郎
    第41回北海道矯正歯科学会総会・学術大会, Jun. 2000, 北海道矯正歯科学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 審美性矯正ワイヤーの変形挙動に与える改良型ブラケットの効果
    宇賀 大; 山方秀一; 永山和典; 豊泉裕; 今井徹; 飯田順一郎; 宇尾基弘; 近藤清一郎; 大川昭治; 菅原敏; 亘理文夫; 小林雅博
    第35回日本歯科理工学会学術講演会, Apr. 2000, 日本歯科理工学会, Japanese, Oral presentation
    東京都, [Domestic Conference]
  • FRP審美性矯正ワイヤーの表面摩擦特性
    諏訪伸輔; 山方秀一; 永山和典; 豊泉裕; 今井徹; 飯田順一郎; 近藤清一郎; 大川昭治; 宇尾基弘; 菅原敏; 亘理文夫; 小林雅博
    第35回日本歯科理工学会学術講演会, Apr. 2000, 日本歯科理工学会, Japanese, Poster presentation
    東京都, [Domestic Conference]
  • 上顎骨骨切り術を行った開咬症例の検討Ⅱ‐術前術後の形態的変化‐
    野寺義典; 山本隆昭; 山崎篤; 古谷忠典; 日下部豊寿; 山方秀一; 佐藤嘉晃; 今井徹; 飯田順一郎
    第10回日本顎変形症学会総会・学術大会, Apr. 2000, 日本顎変形症学会, Japanese, Oral presentation
    大津市, [Domestic Conference]
  • Surgically assisted rapid palatal expansionを併用した顎変形症症例
    石井教生; 佐藤嘉晃; 山方秀一; 山本隆昭; 今井徹; 飯田順一郎; 尾田充孝; 山口博雄; 戸塚靖則; 井上農夫男; 奥田耕一; 高道理; 大畑昇
    第10回日本顎変形症学会総会・学術大会, Apr. 2000, 日本顎変形症学会, Japanese, Oral presentation
    大津市, [Domestic Conference]
  • 顎変形症における上下顎基底骨幅径の不調和に関する一考察
    佐藤嘉晃; 山方秀一; 山本隆昭; 今井徹; 飯田順一郎; 尾田充孝; 山口博雄; 戸塚靖則; 井上農夫男; 奥田耕一; 高道理; 大畑昇
    第10回日本顎変形症学会総会・学術大会, Apr. 2000, 日本顎変形症学会, Japanese, Oral presentation
    大津市, [Domestic Conference]
  • 改良型ブラケットを用いた曲げ試験における審美性矯正用ワイヤーの変形挙動
    宇賀大; 山方秀一; 永山和典; 豊泉裕; 今井徹; 近藤清一郎; 大川昭治; 宇尾基弘; 菅原敏; 亘理文夫; 小林雅博
    第34回日本歯科理工学会学術講演会, Oct. 1999, 日本歯科理工学会, Japanese, Oral presentation
    札幌市, [Domestic Conference]
  • 歯科矯正用審美性FRPワイヤコーティングによる吸水性低減
    亘理文夫; 永山和典; 山方秀一; 豊泉裕; 宇賀大; 今井徹; 宇尾基弘; 小林雅博
    腐食防食学会, Oct. 1999, 腐食防食協会, Japanese, Oral presentation
    東京都, [Domestic Conference]
  • Properties of fabricated rectangular esthetic orthodontic wires
    Toyoizumi H; Yamagata S; Nagayama K; Uga M; Imai T; Nakamura S; Watari F; Kobayashi M
    The 58th annual meeting of the Japanese orthodontic society, Oct. 1999, the Japanese orthodontic society, Japanese, Poster presentation
    Hiroshima (Japan), [Domestic Conference]
  • A Development of the Esthetic Orthodontic Archwire
    Yamagata S; Nagayama K; Toyoizumi H; Imai T; Nakamura S; Watari F; Kobayashi M
    Scientific Session Program Abstracts of Sister School Affiliation (1973-1999) Oregon Health Science University School of Dentistry (OHSU) & Hokkaido University School of Dentistry, Sep. 1999, English
    Sep. 1999 - Sep. 1999, [Invited]
  • Coating on the Surface of Aesthetic Orthodontic Wires
    Yamagata S; Nagayama K; Toyoizumi H; Imai T; Nakamura S; Watari F; Kobayashi M
    The 75th Congress of the European Orthodontic Society, Jun. 1999, European Orthodontic Society, English, Poster presentation
    Strasbourg, France, [International presentation]
  • 臼歯部歯槽骨切り術による著しい片側性鋏状咬合の改善
    佐藤嘉晃; 山方秀一; 山本隆昭; 今井徹; 山口博雄; 戸塚靖則; 井上農夫男; 奥田耕一; 高道理; 大畑昇
    第9回日本顎変形症学会総会・学術大会, May 1999, 日本顎変形症学会, Japanese, Oral presentation
    東京都, [Domestic Conference]
  • 3次元舌運動計測装置を用いた骨格性反対咬合者の母音発音時における舌運動の解析
    藤井元太郎; 山本隆昭; 山崎毅; 古谷忠典; 野寺義典; 山方秀一; 佐藤嘉晃; 今井徹; 中村進治
    第9回日本顎変形症学会総会・学術大会, May 1999, 日本顎変形症学会, Japanese, Oral presentation
    東京都, [Domestic Conference]
  • トルクを有する角形審美性矯正ワイヤーの試作
    豊泉 裕; 山方秀一; 永山和典; 今井徹; 中村進治; 近藤清一郎; 宇尾基弘; 大川昭治; 菅原敏; 亘理文夫; 小林雅博
    第33回日本歯科理工学会学術講演会, Apr. 1999, 日本歯科理工学会, Japanese, Poster presentation
    川崎市, [Domestic Conference]
  • 矯正用ワイヤーの応力集中を軽減するブラケット形状について
    宇賀大; 山方秀一; 永山和典; 豊泉裕; 今井徹; 近藤清一郎; 大川昭治; 宇尾基弘; 菅原敏; 亘理文夫; 小林雅博
    第33回日本歯科理工学会学術講演会, Apr. 1999, 日本歯科理工学会, Japanese, Oral presentation
    川崎市, [Domestic Conference]
  • Fabrication of esthetic FRP wires with flexural and torsional properties for orthodontics
    Toyoizumi H; Yamagata S; Nagayama K; Imai T; Nakamura S; Kondo S; Uo M; Ohkawa S; Sugawara T; Watari F; Kobayashi M
    '99 Symposium on Advanced Research of Energy Technology, Mar. 1999, Center for Advanced Research of Energy Technology, Japanese, Oral presentation
    Sapporo, Japan, [Domestic Conference]
  • Coating procedure on the surface of the esthetic orthodontic wire
    Nagayama K; Yamagata S; Toyoizumi H; Imai T; Nakamura S; Watari F; Kobayashi M
    The 46th annual meeting of Japanese association for dental research, Nov. 1998, Japanese association for dental research (JADR), a division of the international association for dentai research, English, Poster presentation
    Chiba, Japan, [International presentation]
  • 審美性矯正ワイヤーのねじり特性に関する研究
    豊泉裕; 山方秀一; 永山和典; 宇賀大; 今井徹; 中村進治; 亘理文夫; 小林雅博
    第57回日本矯正歯科学会大会, Oct. 1998, 日本矯正歯科学会, Japanese, Poster presentation
    仙台市, [Domestic Conference]
  • 上顎左右第一小臼歯、下顎左右第二小臼歯抜去で動的治療を行った上下顎前突症例
    山方秀一
    第39回北海道矯正歯科学会総会・学術大会, Jun. 1998, 北海道矯正歯科学会, Japanese, Others
    札幌市, [Domestic Conference]
  • 骨格性反対咬合症例の外科的矯正治療後の長期安定性について
    山方秀一; 山崎篤; 大瀧尚子; 佐藤嘉晃; 山本隆昭; 今井徹; 中村進治
    第8回日本顎変形症学会総会・学術大会, May 1998, 日本顎変形症学会, Japanese, Oral presentation
    佐賀市, [Domestic Conference]
  • 上顎片側の臼歯部歯槽骨切り術を併用した顔面非対称症例
    佐藤嘉晃; 山方秀一; 山本隆昭; 今井徹; 中村進治; 山口博雄; 西方聡; 戸塚靖則; 井上農夫男; 奥田耕一; 高道理; 大畑昇
    第8回日本顎変形症学会総会・学術大会, May 1998, 日本顎変形症学会, Japanese, Oral presentation
    佐賀市, [Domestic Conference]
  • Mechanical properties of esthetic orthodontic wires in torsion
    Toyoizumi H; Yamagata S; Nagayama K; Imai T; Nakamura S; Kondo S; Uo M; Ohkawa S; Sugawara T; Watari F; Kobayashi M
    The 31st General Session of the Japanese Society for Dental Materials and Devices, Apr. 1998, Japanese Society for Dental Materials and Devices, Japanese, Oral presentation
    Yokohama, Japan, [Domestic Conference]
  • An experimental study about the surface treatment of the esthetic orthodontic wire
    Nagayama K; Yamagata S; Toyoizumi H; Imai T; Nakamura S; Kondo S; Uo M; Ohkawa S; Sugawara T; Watari F; Kobayashi M
    The 31st General Session of the Japanese Society for Dental Materials and Devices, Apr. 1998, Japanese Society for Dental Materials and Devices, Japanese, Oral presentation
    Yokohama, Japan, [Domestic Conference]
  • Skeletal Class IIIの顎態に対応した歯軸傾斜について : 歯列模型の計測から(一般講演抄録,第39回北海道矯正歯科学会大会)
    山崎 篤; 佐藤 嘉晃; 北澤 慎一; 塚田 東香; 野寺 義典; 日下部 豊寿; 岩崎 弘志; 山方 秀一; 梅田 和宏; 岡崎 恵一郎; 石川 博之; 中村 進治
    北海道矯正歯科学会雑誌, 1998, 北海道矯正歯科学会, Japanese, Oral presentation
    1998 - 1998
  • Effects on mechanical properties of new FRP orthodontic wire under water immersion
    Imai T; Yamagata S; Watari F; Kobayashi M; Yamamoto T; Umeda K; Nakamura S
    The 76th General Session and Exhibition of the international association for dental research (IADR), 1998, International association for dental research (IADR), English, Poster presentation
    Nice, France, [International presentation]
  • An experimental study of tissue reaction to the esthetic orthodontic wire
    Yamagata S; Nagayama K; Yamamoto T; Imai T; Nakamura S; Iizuka T; Watari F; Kobayashi M
    The 56th annual meeting of the Japanese orthodontic society, Sep. 1997, the Japanese orthodontic society, Japanese, Poster presentation
    Tokyo (Japan), [Domestic Conference]
  • Effects of water immersion on the esthetic orthodontic wire (CPSA-FRP wire)
    Nagayama K; Yamagata S; Toyoizumi H; Yamamoto T; Imai T; Nakamura S; Watari F; Kobayashi M
    The 56th annual meeting of the Japanese orthodontic society, Sep. 1997, the Japanese orthodontic society, Japanese, Poster presentation
    Tokyo (Japan), [Domestic Conference]
  • 下顎非対称・偏位症例の外科的矯正治療Ⅱ
    山方秀一; 佐藤嘉晃; 山本隆昭; 今井徹; 中村進治
    第7回日本顎変形症学会総会・学術大会, Jun. 1997, 日本顎変形症学会, Japanese, Oral presentation
    東京都, [Domestic Conference]
  • Effect of water immersion on flexural properties of esthetic orthodontic wires
    Nagayama K; Yamagata S; Toyoizumi H; Imai T; Nakamura S; Kondo S; Ohkawa H; Uo M; Sugawara T; Watari F; Kobayashi M
    The 29th General Session of the Japanese Society for Dental Materials and Devices, Apr. 1997, Japanese Society for Dental Materials and Devices, Japanese, Oral presentation
    Tokyo, Japan, [Domestic Conference]
  • Mechanical Properties and Estheticity of New FRP Orthodontic Wire
    Imai T; Kobayashi M; Watari F; Yamagata S; Nagayama K; Nakamura S
    The 75th General Session and Exhibition of the international association for dental research (IADR), Mar. 1997, International Association for Dental Research (IADR), English, Oral presentation
    Orlando, USA, [International presentation]
  • A study on the mechanical properties of the esthetic orthodontic wire under the wet condition
    Yamagata S; Nagayama K; Yamamoto T; Imai T; Nakamura S; Watari F; Kobayashi M
    The 55th annual meeting of the Japanese orthodontic society, Oct. 1996, the Japanese orthodontic society, Japanese, Poster presentation
    Fukuoka (Japan), [Domestic Conference]
  • In vitro evaluation of esthetic orthodontic wire
    Kobayashi M; Imai T; Yamagata S; Nagayama K; Nakamura S; Watari F; Ohkawa S
    The 28th General Session of the Japanese Society for Dental Materials and Devices, Sep. 1996, Japanese Society for Dental Materials and Devices, Japanese, Poster presentation
    Toyonaka, Japan, [Domestic Conference]
  • Mechanical properties of new esthetic orthodontic archwire with fiber reinforced plastic structure
    Imai T; Yamagata S; Watari F; Kobayashi M; Sato Y; Yamamoto T; Nakamura S
    The 96th Annual Session of American Association of Orthodontists (AAO), May 1996, American Association of Orthodontists (AAO), English, Poster presentation
    Denver, USA, [International presentation]
  • 不正咬合者における未萌出側方歯群歯冠幅径予測に関する臨床的研究(一般講演抄録,第37回北海道矯正歯科学会大会)
    山崎 毅; 上野 拓郎; 金子 知生; 梅田 和宏; 杉山 治; 山方 秀一; 浦本 英二; 松山 功; 柳 禎子; 由川 将丈; 今井 徹; 中村 進治
    北海道矯正歯科学会雑誌, 1996, 北海道矯正歯科学会, Japanese, Oral presentation
    1996 - 1996
  • An experimental study of the development of an esthetic transparent orthodontic wire with fiber reinforced plastic structure
    Yamagata S
    The Hokkaido Association for Dental Science Meeting 1995, Nov. 1995, the Hokkaido Association for Dental Science, Japanese, Oral presentation
    Sapporo (Japan), [Domestic Conference]
  • A study on the mechanical properties of the esthetic orthodontic wire
    Yamagata S; Yamamoto T; Imai T; Nakamura S; Watari F; Kobayashi M
    The 54th annual meeting of the Japanese orthodontic society, Oct. 1995, the Japanese orthodontic society, Japanese, Oral presentation
    Sapporo (Japan), [Domestic Conference]
  • Fabrication and properties of esthetic orthodontic wire with FRP structure
    Yamagata S; Imai T; Nakamura S; Kondo S; Ohkawa S; Uo M; Sugawara T; Watari F; Kobayashi M
    The 26th General Session of the Japanese Society for Dental Materials and Devices, Sep. 1995, Japanese Society for Dental Materials and Devices, Japanese, Oral presentation
    Sendai, Japan, [Domestic Conference]
  • An experimental study on the mechanical properties of the esthetic orthodontic wire
    Yamagata S; Imai T
    The 53rd annual meeting of the Japanese orthodontic society, Oct. 1994, the Japanese orthodontic society, Japanese, Poster presentation
    Koriyama (Japan), [Domestic Conference]
■ Syllabus
  • 口腔顎顔面発達学研究Ⅰ, 2024年, 博士後期課程, 歯学院
  • 口腔顎顔面発達学研究Ⅱ, 2024年, 博士後期課程, 歯学院
  • 歯科矯正学研究Ⅰ, 2024年, 博士後期課程, 歯学院
  • 歯科矯正学研究Ⅱ, 2024年, 博士後期課程, 歯学院
  • 口腔機能学実習Ⅰ, 2024年, 博士後期課程, 歯学院
  • 口腔機能学実習Ⅱ, 2024年, 博士後期課程, 歯学院
  • 口腔機能学実習Ⅲ, 2024年, 博士後期課程, 歯学院
  • 口腔機能学実習Ⅳ, 2024年, 博士後期課程, 歯学院
  • 口腔機能学実習Ⅴ, 2024年, 博士後期課程, 歯学院
  • 歯科矯正学臨床実習Ⅰ, 2024年, 学士課程, 歯学部
  • 歯科矯正学臨床実習Ⅱ, 2024年, 学士課程, 歯学部
  • 歯科矯正学基礎実習, 2024年, 学士課程, 歯学部
  • 歯科矯正学Ⅰ, 2024年, 学士課程, 歯学部
  • 歯科矯正学Ⅱ, 2024年, 学士課程, 歯学部
■ Affiliated academic society
  • The Japanese Society for Jaw Deformities
  • Japanese Association for Dental Research
  • American Association of Orthodontists
  • The Japanese Society for Dental Materials and Devices
  • World Federation of Orthodontists
  • International Association for Dental Research
  • The Hokkaido Orthodontic Society
  • JAPANESE ORTHODONTIC SOCIETY
■ Research Themes
  • Novel orthodontic treatment conserving sound enamel - Introduction of microwave chemistry and low environmental load substances -
    Grant-in-Aid for Scientific Research (C)
    Apr. 2022 - Mar. 2026
    YAMAGATA Shuichi
    Ministry of Education, Culture, Sports, Science and Technology, Grant-in-Aid for Scientific Research (C), 北海道大学, Principal investigator, 22K10235
  • Novel orthodontic treatment conserving sound enamel - Application of quantum mechanics, coordination chemistry and plasma physics -
    Grant-in-Aid for Scientific Research (C)
    Apr. 2018 - Mar. 2022
    YAMAGATA Shuichi
    A multi bracket appliance is one of the most popular orthodontic appliances, however, damage to enamel such as acid treatment (at the time of gluing) and cutting (at the time of removal) has been considered inevitable. To avoid or reduce such damage, we have been devising modification methods for enamel surface and developing adhesives with visibility only when necessary.
    Owing to the support by JSPS KAKENHI Grant Number 18K09826, we have succeeded in fabricating urethane-based fluorescent bonding materials with either europium containing nanoparticles or Eu complexes at a laboratory level. Specifically, Y2O3:Eu3+ and Tris(1,3-diphenyl-1,3-propanedionato)(1,10-phenanthroline)Eu3+ were confirmed to be quite effective to make dimethacrylate adhesives fluorescent.
    Ministry of Education, Culture, Sports, Science and Technology, Grant-in-Aid for Scientific Research (C), Hokkaido University, Principal investigator, Competitive research funding, 18K09826
  • Novel orthodontic treatment that can conserve sound enamel - Application of non-thermal atmospheric pressure plasma and fluorescent materials -
    Grants-in-Aid for Scientific Research(C)
    Apr. 2015 - Mar. 2018
    Shuichi YAMAGATA
    Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(C), 北海道大学, Principal investigator, Competitive research funding
  • A development of nanocomposite structured transparent orthodontic wires with antimicrobial activity
    Grants-in-Aid for Scientific Research(C)
    Apr. 2012 - Mar. 2015
    Shuichi YAMAGATA
    We have been developing transparent composite materials with enough properties such as mechanical properties and so forth comparable with metal orthodontic wires to make the multibracket appliance which is used in orthodontic treatments more esthetically acceptable. We have taken particular note of montmorillonite (MMT), one of the representative layered silicates, as a reinforcing material. Owing to the support by JSPS KAKENHI [Grant-in-Aid for Scientific Research (C)] Grant Number 24593070, we successfully fabricated both poly(methyl methacrylate) (PMMA)/silanized organically modified MMT (s-OMMT) composites and poly(L-lactic acid) (PLLA)/s-OMMT composites with nanoscale reinforcement architecture. The remarkable results obtained through this study encourage us to make them applicable for transparent fiber reinforced plastic (FRP) orthodontic wires.
    Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(C), 北海道大学, Principal investigator, Competitive research funding
  • Application of nanomaterials to the development of FRP esthetic orthodontic wire
    Grants-in-Aid for Scientific Research(C)
    Apr. 2008 - Mar. 2011
    Shuichi YAMAGATA
    To make the multibracket appliance used in orthodontic treatments more esthetically acceptable, we have been developing transparent composite materials with enough mechanical properties comparable with metal wires. Owing to the support by a Grant-in-Aid for Scientific Research (C), we successfully fabricated PMMA/layered silicate composites with nanoscale reinforcement architecture. The remarkable results obtained through this study encourage us to make them applicable for transparent FRP orthodontic wires.
    Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(C), 北海道大学, Principal investigator, Competitive research funding, 20592385
  • 繊維強化型審美性矯正用ワイヤーの機械的特性保持を目的とする審美性ブラケットの開発
    科学研究費補助金(奨励研究(A))
    Apr. 2000 - Mar. 2002
    山方 秀一
    研究期間における当該研究の主な成果は次の通りであった。1.上顎中切歯用ポリカーボネート製ブラケット(ブラケット幅4.0mm、従来型)のエッジおよびウィングを削合することで、曲率半径0.5mmの辺縁形状を有する改良型ブラケットの試作に成功した。2.繊維体積分率50.0%、直径0.5mmの繊維強化型審美性矯正用ワイヤー(FRPワイヤー)を試験片とし、乾燥条件下での片持ちばり曲げ試験を行ったところ、限界たわみ距離は従来型に対して約1.4倍に増加することがわかった。3.2.と同様の試験片を用い、湿潤条件下での1.5mmまでの片持ちばりヒステリシス試験から、たわみ量1.0mmにおける荷重維持率(除荷時荷重値/負荷時荷重値)は従来型に対して約1.9倍に増加することがわかった。これらは、主としてブラケット辺縁部における曲率半径の増加および剪断力の回避によると考えられた。また、力点までのスパンが増加したことも関与したと考えられた。4.ブラケット-ワイヤー間の摩擦特性を評価するために、懸垂式分銅の構造を有する摩擦試験機を一面および二面接触型の2種について試作した。5.二面接触条件での見かけの静摩擦係数は、理論値の上限にあたる一面接触条件での静摩擦係数の√<2>倍よりやや大きく、およそ1.4から2.0倍の値を示すことが明らかとなり、試験機の有効性が確認された。6.FRPワイヤーと単結晶アルミナ製およびポリカーボネート製、ステンレス製ブラケットとの間の静摩擦係数は、矯正用金属ワイヤーを用いた場合よりおよそ1.5倍大きいことがわかった。また、FRPワイヤーと多結晶アルミナブラケットとの間の静摩擦係数は、金属ワイヤーを用いた場合よりおよそ4.5倍と特異的に大きいことが明らかとなった。このことには、主に多結晶アルミナ部材表面の微細な凹凸とFRPワイヤーの表面硬さとの相性が関与したと推測できた。
    文部科学省, 奨励研究(A), 北海道大学, Principal investigator, Competitive research funding, 12771266
  • Development of the analizing system for Orofacial function
    Grants-in-Aid for Scientific Research(C)
    2000 - 2001
    Takaaki YAMATOMO; Junichiro IIDA; Tohru IFUKUBE; Shyuichi YAMAGATA
    We have developed a 3D tongue movement measuring system employing an electromagnetic sensing system that uses five small and lightweight coils. This system was used to measure and compare tongue movements in normal subjects and in skeletal Class III subjects during articuration of five Japanese vowel (/a/, /i/, /u/, /e/ and /o/) sounds. The subject sat in a relaxed posture on a chair, and the subject's head was positioned so that the Frankfurt horizontal plane and floor were approximately parallel. Before commencing the experiment, the subject was given sufficient practice at pronouncing vowel sounds with measurement device in place. The vowel sounds were analyzed using linear predictive coding (LPC), and the frequencies of the first formant (F1) and second formant (F2) of the vowels were calculated. The results were then compared with the results of analysis of tongue movements. The subjects of measuring tongue movement were three normal subjects (3 males) and three skeletal Class III subjects (3 females). And the subjects of analysing vowel sound were 17 skeletal Class III patients (5 males, 12 females) and 13 normal subjects (8 males, 5 females).The results were as followes.1) The frequency of the second formant of /u/ in the skeletal Class III patients was significantly (P<0.01) higher than that in the normal subjects.2) The skeletal class III patients showed compensatory tongue movements to make articulation points by using the rear part of the tongue instead of moving the tongue backward when uttering the closed vowels(/i/,/u/).3) This compensatory tongue movement was effective for uttering /i/ but not for uttering /u/.
    Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(C), 北海道大学, Coinvestigator not use grants, Competitive research funding, 12671982
  • Evaluation on the mechanical properties and biocompatibility of the FRP esthetic orthodontic wire for clinical application
    Grants-in-Aid for Scientific Research(A)
    1998 - 2001
    今井 徹; Yoshiaki SATO; 中村 進治; Masahiro KOBAYASHI; Fumio WATARI; Takaaki YAMAMOTO; Syuichi YAMAGATA; Motohiro UO
    The evaluation on the mechanical properties and biocompatibility of the FRP esthetic orthocontic wire for clinincal appoication is the aim of this research. The results are as follows:1. After the FRP wire have been immersed in mechanical properties through water immersion. The deactivating load and elastic recovery in s hysterisis loop decreased much after water immersion. To prevent this, Bis-GMA was coated by R＆D method. The FRP with this coating by the method of R＆D with dipping speed 1 cm/min., showed sufficient rtention of flesural load (D/L 60-80 %) and good elastic recovery even after 30 days.2. To develop the FRP wires in combination with biocompatible CaO-P_2O_5-SiO_2-Al_2O_3 (CPSA) glass fibers and PMMA matrix by hot drawing method, a photo cure polymerization method was applied to form the rectangular timber with a sufficient torque force. The FRP wire using dental composite resin for matrix showed a torsional load of 1/2 of Ni-Ti wire. This showed that the fiber content mainly contributes to flexural load while the use of stigg materials for the matrix is much more effective for improbing torsional properties.3. To avoid the shear force exerted by ligatures, improved brackets with various radius curvature were evaluated. The limit of deflection of the FRP wire and the recovery of the elastic properties improved with the larger radius curvatures. It was also clarified from ligated bending test that good elastic recovery and high load-retention could be obtained.4. The frictional properties between orthodontic wires and brackets and frictional coefficients were obtained under conditions of single contact plane and double contact planes. The friction properties of FRP wire with brackets were similar to those of metal wires expect for the polycrystalline alumina bracket.
    Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(A), 北海道大学, Coinvestigator not use grants, Competitive research funding, 10357019
  • 線維強化プラスチック型審美性矯正用ワイヤー用ブラケットの開発
    ホクサイテック財団研究開発支援事業
    Jun. 1999 - May 2000
    山方 秀一
    ホクサイテック財団, Principal investigator, Competitive research funding
  • Development of the CPSA-FRP esthetic orthodontic wire
    Commissioned research
    Apr. 1996 - Mar. 2000
    Shuichi Yamagata
    Rockey Mountain Morita Corp., Sun Medical Co., Ltd., Principal investigator, Competitive research funding
  • Research and development on basic physical properties and biosafety of esthetic fiber-reinforced plastic orthodontic wire
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    Apr. 1996 - Mar. 1997
    今井 徹; 小林 雅博; 亘理 文夫; 佐藤 嘉晃; 山本 隆昭; 中村 進治
    繊維強化プラスチック型審美性矯正用ワイヤー(以下、ワイヤー)の強化繊維であるCPSA系ガラス繊維(以下、ガラス繊維)とマトリックス材のPMMA(三菱レイヨン製VH種)との界面接着強度変化による機械的強度の影響を調べるため、従来の6%酢酸水溶液で0.3vol%に調節したシランカップリング剤A-174(日本ユニカ-製)に加えて、pH3.9とpH4.2の酢酸水溶液で0.8vol%に調節したシランカップリング剤KBM1003(信越化学工業製)及び表面未処理のものを作製して3点曲げ試験を行った。その結果、従来のカップリング剤であるA-174によるワイヤーが最も良好な曲げ弾性率を示した。
    水中への長期浸漬によるワイヤーの機械的強度への影響を調べるため、水温可変式水槽内で3点曲げ試験を行った。浸漬実験の結果、23、37、50℃のいずれの水温でもポリマー体積分率が高いほど温度変化を受けやすいことが分かった。しかし、ワイヤー機械的強度の低下は最大で約9%の範囲内であり、矯正臨床上は問題とならない程度の低下であった。また、浸漬実験後のワイヤーの内部構造を光学顕微鏡とSEMで観察した結果、ワイヤーに最大引張応力がかかる部分ではガラス繊維-マトリックス間の界面剥離、一部のガラス繊維の破断が認められ、一方最大圧縮応力がかかる部分界面の剥離のみが観察された。
    ワイヤーをフッ素系コーティング剤Scotch Guard(住友3M製)でコーティングし、水中浸漬実験を行った結果、Scotch Guardによるコーティングの効果は認められなかった。
    ラットの背部皮下にCPSAガラス繊維、PMMAペレット、ワイヤーをそれぞれ3日、1週間、3週間、6週間埋め込み、病理組織学的観察を行った。その結果、全ての試料で線維性結合組織による被包化が認められ、生体への危険性は少ないと考えられた。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, Others, 08672353
■ Industrial Property Rights
  • 歯列矯正ワイヤーおよびその製造方法
    Patent right, 小林 雅博; 亘理 文夫; 今井 徹; 豊泉 裕; 山方 秀一, 小林 雅博, 亘理 文夫, 今井 徹, ユニチカグラスファイバー株式会社, 株式会社ロッキーマウンテンモリタ, サンメディカル株式会社
    JP2000001548, 14 Mar. 2000
    WO2001-068013, 20 Sep. 2001
    200903037114365722
  • 複合材料ワイヤーおよび荷重−たわみ挙動の制御方法
    Patent right, 小 林; 雅 博; 亘 理; 文 夫; 今 井 徹; 中 村; 進 治; 中 山; 民 弘; 山 下; 道 男; 竹 山 守, 小林 雅博, 亘理 文夫, 今井 徹, 中村 進治, ユニチカグラスファイバー株式会社, 株式会社ロッキーマウンテンモリタ, サンメディカル株式会社
    特願平9-184153, 09 Jul. 1997
    特開平11-019100, 26 Jan. 1999
    特許第3227408号
    31 Aug. 2001
    201103086240563075
  • 複合材料ワイヤーおよび荷重−たわみ挙動の制御方法
    Patent right, 小 林; 雅 博; 亘 理; 文 夫; 今 井 徹; 中 村; 進 治; 中 山; 民 弘; 山 下; 道 男; 竹 山 守, 小林 雅博, 亘理 文夫, 今井 徹, 中村 進治, ユニチカグラスファイバー株式会社, 株式会社ロッキーマウンテンモリタ, サンメディカル株式会社
    特願平9-184153, 09 Jul. 1997
    特開平11-019100, 26 Jan. 1999
    200903062867140027
  • 審美性に優れた歯科矯正ワイヤー
    Patent right, 小林 雅博; 亘理 文夫; 今井 徹; 中村 進治, 小林 雅博, 亘理 文夫, 今井 徹, 中村 進治
    特願平8-208696, 08 Aug. 1996
    特開平9-294749, 18 Nov. 1997
    200903046382828149
■ Academic and Social Contribution Activities/Other
Industrial Property Rights
  • Ackowledgement for consistently providing the critical and suitable reviews of manuscripts allocated from 2006 to 2010
    01 Jan. 2006 - 31 Dec. 2010
    Others
    The Japanese Orthodontic Society
  • Sister School Affiliation (1973-1999) Oregon Health Science University School of Dentistry (OHSU) & Hokkaido University School of Dentistry
    28 Sep. 1999 - 03 Oct. 1999
    Others
    Others
    Oregon Health Science University School of Dentistry & Hokkaido University School of Dentistry
Social Contribution Activities
  • part-time teacher
    01 Apr. 1998 - 31 Mar. 2013
    Lecturer
    池見札幌歯科衛生士専門学校
Others
  • Apr. 2012 - Mar. 2013
    北海道大学高等教育推進機構クラス副担任
  • Apr. 1994 - Mar. 2001
    Collaborative project (Department of Industrial Chemistry, Chiba Institute of Technology)
    Engineering research on FRP wire for orthodontic treatment
  • Apr. 1996 - Apr. 1999
    Collaborative project (Sun Medical Co.,Ltd, Rockey Mountain Morita Corp., Unitika Glass Fiber Co.,Ltd)
    Development of FRP wire for orthodontic treatment