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Ueda Yasuo

Faculty of Dental Medicine　Division of Dental Medicine　Department of Functional ScienceAssociate Professor
Hokkaido University HospitalAssociate Professor

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
  • Additive Manufacturing
  • Rapid Prototyping
  • Dental CAD/CAM system
Research Field
  • Life Science, Biomaterials
  • Life Science, Biomedical engineering
  • Life Science, Prosthodontics, Crown and Bridge Prosthodontics
■ Educational Organization

Career

■ Career
Career
  • Apr. 2025 - Present
    Hokkaido University, Crown and Bridge Prosthodontics, Department of Oral Functional Science, Faculty of Dental Medicine and Graduate School of Dental Medicine, Associate Professor
  • Feb. 2018 - Mar. 2025
    Hokkaido University, Crown and Bridge Prosthodontics, Department of Oral Functional Science, Faculty of Dental Medicine and Graduate School of Dental Medicine, Associate Professor
  • Apr. 1999 - Jan. 2018
    - 北海道大学 大学院歯学研究科 口腔機能学講座 講師
  • Oct. 1997 - Mar. 1999
    Hokkaido University, School of Dental Medicine
  • Aug. 1992 - Sep. 1997
    Hokkaido University, School of Dental Medicine
  • Apr. 1992 - Jul. 1992
    Hokkaido University, School of Dental Medicine
Educational Background
  • Apr. 1988 - Mar. 1992, Hokkaido University, Graduate School, Division of Dental Research, 歯学臨床系専攻, Japan
  • Apr. 1982 - Mar. 1988, Hokkaido University, Faculty of Dentistry, School of Dentistry, Japan
Committee Memberships
  • 2016 - Present
    日本口腔顎顔面技工学会, 評議員・理事（相談役）, Society
  • 2014 - Present
    一般社団法人日本顎顔面補綴学会, 代議員, Society
  • 2013 - Present
    公益社団法人日本補綴歯科学会, 代議員, Society
  • 2006 - Present
    日本補綴歯科学会, 東北・北海道支部 評議員, Society
  • Jul. 2022 - Jun. 2024
    公益社団法人日本補綴歯科学会, 修練医・認定医・専門医認定委員会 委員, Society
  • Apr. 2021 - Mar. 2024
    公益社団法人日本補綴歯科学会 医療問題検討委員会, 委員, Society
  • 2018 - 2020
    公益社団法人日本補綴歯科学会, 専門医認定委員会 委員, Society
  • 2007 - 2008
    日本補綴歯科学会, 東北・北海道支部 幹事, Society

Research activity information

■ Awards
  • Jun. 2009, 日本顎顔面補綴学会, 平成20年度優秀論文賞
    耳介形状データベースの構築−形状データの収集と生体再建用テンプレートの試作−
    上田康夫;西川圭吾;大畑 昇;井上農夫男, Japan
  • Jul. 2002, 日本歯科医学教育学会, 教育システム開発賞
    窩洞形成シミュレーションの開発 第４報 う蝕情報の追加
    大槻昌幸;田上順次;林 豊彦;戸松孝文;中村康雄;合田英紀;上田康夫;大畑 昇
■ Papers
  • A Case of Prosthodontic Treatment for a Patient with Extensive Tooth and Lip Loss due to Trauma
    MIZUNO Mariko; UEDA Yasuo
    MAXILLOFACIAL PROSTHETICS, 47, 1, 31, 35, Japanese Academy of Maxillofacial Prosthetics, 2024, [Peer-reviewed]
    Japanese, The patient was a male in his 30s with the chief complaints of esthetic and masticatory disorder due to missing upper and lower front teeth and flap reconstruction of the lip soft tissue. Seven months had passed since upper lip revision surgery was performed by a plastic surgeon, but the lower lip still had volume from the flap reconstruction. Prosthodontic treatment was requested prior to further surgery. The prosthesis fabrication was planned according to the usual method, and the patient himself chose dentures. However, depending on the condition of the soft tissues after surgery, each step until the completion of the denture continued through trial and error, but after the completion of the denture, the patient himself got used to it faster than the prosthodontist had expected, and a certain degree of satisfaction was obtained with the insertion of the prosthetic device.

    In the future, we would like to study a treatment workflow with more predictability and efficiency by utilizing digital technologies such as intraoral scanners and simulation software for facial analysis and denture duplication.
  • 「医科連携の歯科技工業務の現状について」 3Dプリンターを用いた生体技工部の取り組みについて
    若林 侑輝; 西川 圭吾; 鈴木 崇祥; 曽山 武士; 足利 雄一; 阪野 充; 道田 智宏; 上田 康夫; 横山 敦郎
    日本口腔顎顔面技工学会会誌, 22, 1, 28,43, 29,43, 日本口腔顎顔面技工学会, Dec. 2022, [Peer-reviewed]
    Japanese
  • Clinical findings of patients with sleep bruxism: Comparison with patients with temporomandibular disorders and patients with sleep apnea syndrome
    木村一誠; 山口泰彦; 三上紗季; 斎藤未來; 後藤田章人; 櫻井泰輔; 前田正名; 中島利徳; 齋藤大嗣; 町田友梨; 水野麻梨子; 山田恭子; 高橋萌; 高橋奏多; 工藤愛; 石丸智也; 上田康夫
    日本補綴歯科学会誌(Web), 14, 2022, [Peer-reviewed]
  • 光透視による支台歯マージン形状の検出の試み(第3報)
    上田 康夫; 加藤 祐次; 山口 泰彦; 清水 孝一
    日本補綴歯科学会誌, 9, 特別号, 235, 235, (公社)日本補綴歯科学会, Jun. 2017
    Japanese
  • History of and Current Situation Regarding Dental CAD / CAM Systems and Future Perspectives.
    Yasuo UEDA; Taihiko YAMAGUCHI
    Hokkaido Journal of Dental Science, 38, 特別, 104, 110, 北海道歯学会, 2017
    English, Scientific journal, The Dental CAD/CAM system has been in use for more than 30 years, and has been an indispensable tool for dental workflow. Before this practical system was in operation, it was necessary to develop computer technology in the handling of 3-dimensional data freely and to advance new dental materials. This trend will continue to expand in the future. Recently, optical impressions are taken instead of using impression materials against the background of great progress in sensor technology. Likewise, dental workflows that do not need plaster working models have become mainstream. In this paper, we outline the history and current trends of this technology, and describe prospects for the future.
  • Construction method of a tooth crown model using data generated by micro-focus CT - Voxel models of anterior and premolar teeth -
    Yasuo Ueda; Yuya Kobayashi; Osamu Takamichi; Noboru Ohata
    Hokkaido Journal of Dental Science, 33, 1, 17, 23, 北海道歯学会, 2012, [Peer-reviewed], [Lead author]
    English, Scientific journal, Currently, a number of dental CAD/CAM systems are in operation in Japan. Many of them adopt a non-contact optical system using a CCD camera and light patterns to measure the model teeth. One disadvantage of this method is that it is difficult to measure the parts in the shade. However, this problem can be solved if we can carry out measurements using 3D CT. In this study we have examined how to construct a 3D model of a tooth crown shape using micro-CT data. An R_mCT2 micro-CT manufactured by Rigaku Corporation was used under maging conditions of FOV10（φ10 mm×H10 mm）, 90 kV tube voltage and 160 μA tube current. Basic study models manufactured by KaVo Dental GmbH were used in the imaging, which was carried out in two phases, as the size of the artificial teeth was greater than that of the FOV. The image data was output in 512 slices in the form of DICOM files, and transferred to a personal computer. We examined the CT values of all the voxels of all images using software we developed ourselves. Based on the results, we determined the threshold by comparing the distribution of the CT values of the artificial teeth area with those of the remaining area in each image, and extracted the shape of the artificial tooth by binarizing the image. The separate image data was aligned by detecting the location of the closest number of pixels to the binarized image. Artifacts included in the images were removed manually and the completed voxel data output in DICOM format. Shape was confirmed using free DICOM viewer software（OsiriX）. As a result, the margin of error for superimposing the contour shape of the split image data is approximately one voxel（± 20 μm）. Artifacts were seen in 20 to 50 slices of the binarized images but because they were minor, we were able to process the images quickly and easily. In this study we were able to construct a high-resolution model of artificial teeth with relative ease. In future, if we can success in realizing low-cost, higher performance dental cone-beam CT, we will be able to use it to measure abutment teeth.
  • Clinical Applications of a Maxillofacial Model using a Rapid Prototyping Technique in the Center for Dental Clinics, Hokkaido University Hospital
    OOI Kazuhiro; UEDA Yasuo; KUROSU Takuro; MATSUSHITA Kazuhiro; ONO Mitsunobu; YAMAGUCHI Hiro-o; TAKANO Masashi; KITADA Hideaki; SAKAKIBARA Noriyuki; NISHIKAWA Keigo; OHATA Noboru; INOUE Nobuo; TOTSUKA Yasunori
    北海道歯学雑誌, 31, 2, 112, 120, 北海道歯学会, Dec. 2010, [Peer-reviewed]
    Japanese, Scientific journal, 北海道大学病院歯科診療センターでは，2001年からRapid Prototyping Techniqueによる粉末凝結式積層造型装置を導入し，この装置により作製した顎顔面模型(以下RP顎顔面模型)を用いて手術シミュレーションを行なっている.そこでわれわれは，当院におけるRP顎顔面模型の臨床応用の実績と概要を報告する.対象は2001年1月から2009年1月までに北海道大学病院歯科診療センターでRP顎顔面模型を用いて手術シミュレーションなどを行った症例とした.症例の顎顔面をCT撮影し，骨データを抽出して金属アーチファクトを除いたデータを取得した.これらのデータを三次元画像表示解析ソフトウェアで三次元構築処理し，積層造形装置Z402で症例のRP顎顔面模型を作製した.8年間でRP顎顔面模型を使用した症例は139例であった.その内訳は，顎矯正手術93例，顎堤形成術・骨移植術22例，悪性腫瘍切除術・顎骨再建術15例，口蓋形成術4例，インプラント埋入手術3例，エピテーゼ2例であった. 症例1：小下顎症と顔面非対称の顎矯正手術において，RP顎顔面模型を骨切りし，上下顎骨形成術をシミュレーションして手術を行なった. 症例2：骨格性右側方開咬の顎矯正手術において，RP顎顔面模型を骨切りし，移動骨片の異動量・方向，骨延長装置を決定し，骨延長法をシミュレーションして手術を行なった. 症例3：右下顎歯内癌の腫瘍切除術と顎再建術においてRP顎顔面模型を用いて下顎骨区域切除と再建をシミュレーションして手術を行なった. 症例4：耳介エピテーゼの製作に際し，RP顎顔面模型によりエピテーゼの原型を作製した.これらのRP顎顔面模型の臨床応用は，治療計画の困難な症例において，精度と安全性を高めるうえで有用であった.
  • Investigation of A Rapid Prototyping Device for Maxillofacial Prosthodontics
    UEDA Yasuo; NISHIKAWA Keigo; TAKAMICHI Osamu; OHSAWA Takashi; OOI Kazuhiro; INOUE Nobuo; OHATA Noboru
    Maxillofacial prosthetics, 33, 1, 35, 40, Jun. 2010, [Peer-reviewed]
    Japanese, Scientific journal
  • Trial Production of Lightweight Auricular Prosthesis Using Foaming Polyurethane Resin
    UEDA Yasuo; NISHIKAWA Keigo; OHSAWA Takashi; OHATA Noboru
    顎顔面補綴 = Maxillofacial prosthetics, 32, 1, 29, 31, Jun. 2009, [Peer-reviewed]
    Japanese, Scientific journal
  • 口腔インプラント学卒前教育基準策定（日本歯科医学会2008.05.28）に対する北海道大学 dental implant 科目単位の実質化の提言
    大畑昇; 高道理; 上田康夫; 會田英紀; 佐藤華織; 谷野之紀; 友永章雄; 本田和枝; 井上真一郎; 太田貴之; 坂田美幸; 市川靖子; 田村信一郎; 内山洋一; 二俣隆夫; 清水純一; 白鳥孝之; 狩野薫; 清水穂高; 中川英俊; 藤本篤士; 尾崎和郎; 丸山道朗; 畑中めぐみ; 石山司; 中村順三; 清水則夫; 佐久間孝二; 大田隆造; 池田雅彦; 小屋秀俊; 青山康彦; 金森敏和; 加藤清志; 品川拓人; 小野真資; 高田勲; 井上達也; 友永泰弘
    北海道歯会誌, 64, 121, 124, 2009, [Peer-reviewed]
    Japanese, Scientific journal
  • Construction of Auricular Shape Database : Collection of Shape Data and Making of Prototype Template for Surgical Reconstruction of Auricula
    UEDA Yasuo; NISHIKAWA Keigo; OHATA Noboru; INOUE Nobuo
    顎顔面補綴 = Maxillofacial prosthetics, 31, 1, 10, 16, Jun. 2008, [Peer-reviewed]
    Japanese, Scientific journal
  • 安全で確実なメタル・クラウン・ブリッジの撤去方法−北大方式の解説と勧め−
    大畑昇; 高道理; 上田康夫; 會田英紀; 佐藤華織; 谷野之紀; 友永章雄; 本田和枝; 井上真一郎; 太田貴之; 長谷川裕司; 米山誠; 市川靖子; 田村信一郎; 内山洋一; 二俣隆夫; 清水純一; 白鳥孝之; 狩野薫; 清水穂高; 中川英俊; 藤本篤士; 尾崎和郎; 丸山道朗; 畑中めぐみ; 石山司; 中村順三; 清水則夫; 佐久間孝二; 大田隆造; 池田雅彦; 小屋秀俊; 青山康彦; 金森敏和; 加藤清志; 品川拓人; 小野真資; 高田勲; 井上達也; 友永泰弘
    北海道歯科医師会誌, 63, 169, 172, 2008, [Peer-reviewed]
    Japanese, Scientific journal
  • Additional Retention of an Auricular prosthesis provided by a titanium Earpiece Resting in the External Auditory meatus : Case of Porcerain-coated Titanium Earpiece
    西川 圭吾; 大澤 孝; 上田 康夫; 輪島 克司; 道田 智宏; 阪野 充
    日本歯科技工学会雑誌, 28, 2, 211, 211, Dec. 2007, [Peer-reviewed]
    Japanese, Scientific journal
  • 振動吸収剤を保持方法に用いた耳介エピテーゼの経過観察
    西川圭吾; 大澤 孝; 輪島克司; 道田智宏; 高木敏彦; 阪野 充; 上田康夫; 大畑 昇
    口腔顎顔面技工懇話会誌, 6, 31, 2006
    Japanese, Symposium
  • QDT Selected ARTICLE Japan チタン製イヤピースを維持に利用した耳介エピテーゼの製作
    西川圭吾; 上田康夫; 大澤孝; 大畑昇; 輪島克司; 高木敏彦; 阪野充; 道田智宏; 井上農夫男; 山本有平; 佐々木了; 川嶋邦裕
    Quintessence of Dental Technology, 31, 11, 1429, 1438, 2006
    Japanese
  • Detection of slice images with artifacts from CT data
    UEDA Yasuo; TAMURA Shintaro; OHATA Noboru; INOUE Nobuo
    顎顔面補綴, 28, 2, 1, 7, Dec. 2005, [Peer-reviewed]
    Japanese, Scientific journal
  • Automatic Extraction of Teeth Forms from 3D-CT
    TAMURA Shintaro; UEDA Yasuo; OHATA Noboru
    北海道歯学雑誌, 26, 1, 19, 23, Jun. 2005, [Peer-reviewed]
    Japanese, Scientific journal
  • Making a facial prosthetsis of auricle of ear
    上田 康夫; 西川 圭吾
    北海道歯学雑誌, 第25巻, 第2号, 368, 372, Dec. 2004
    Japanese, Scientific journal
  • Automatic Extraction of Mastication Muscles from 3D-CT with a Region Growing Method
    TAMURA Shintaro; UEDA Yasuo; OHATA Noboru
    北海道歯学雑誌, 25, 2, 212, 222, Dec. 2004, [Peer-reviewed]
    Japanese, Scientific journal
  • Application of rapid prototyping technology in constructing an auricular prosthesis
    Yasuo Ueda; Sintaro Tamura; Takaaki Ninomiya; Hideki Aita; Noboru Ohata; Yosiaki Satoh; Kazuhiro Oui; Noboru Inoue
    Maxillofacial Prosthet, 27, 1, 13, 19, (一社)日本顎顔面補綴学会, 01 Jun. 2004, [Peer-reviewed]
    English, Scientific journal, エピテーゼは,失われた軟組織を生体により再建することが困難な場合に有効な補綴物である.その作製には,熟練した技能が必要で,これまで誰もが容易に作れるものではなかった.しかし,著者らは3次元CTからの形態情報を元に,積層造形法を応用して,術者が比較的容易に失われた形状を再現できるシステムの構築を試みてきた.そこで,実際の症例を交えながら,このシステムを紹介し,更にシステムそのものの評価を行い述べた
  • 領域拡張法を用いた三次元CTデータからの頭蓋骨形態の抽出と実体模型の作製
    田村 信太郎; 上田 康夫; 二宮 隆明; 大畑 昇; 大井 一浩; 井上 農夫男
    日本顎変形症学会雑誌, 13, 3, 222, 222, (NPO)日本顎変形症学会, Dec. 2003
    Japanese
  • 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
    日本顎変形症学会雑誌, 13, 3, 204, 204, (NPO)日本顎変形症学会, Dec. 2003
    Japanese
  • 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
    日本顎変形症学会雑誌, 13, 3, 203, 204, (NPO)日本顎変形症学会, Dec. 2003
    Japanese
  • A Case of Tongue Pain Reduced by Adjusting Occlusal Bite
    UEDA Yasuo
    Nihon Hotetsu Shika Gakkai Zasshi, 47, 5, 832, 833, 社団法人 日本補綴歯科学会, Dec. 2003, [Peer-reviewed]
    Japanese, Scientific journal
  • The Medical Application of Rapid-prototyping Technology
    UEDA Yasuo; AITA Hideki; NINOMIYA Takaaki; TAMURA Sinntaro; SATOH Noriyuki; OHATA Noboru
    北海道歯学雑誌, 24, 1, 3, 14, 15 Jun. 2003, [Invited]
    Japanese, Scientific journal
  • ラピッドプロトタイピングに用いる三次元CTデータから金属アーチファクトを除去するための新しい方法(A New Method of Removing Metal Artifacts from 3D-CT Data for Rapid Prototyping)
    會田 英紀; 上田 康夫; 奥田 耕一; 大畑 昇; 井上 農夫男; 小林 広美; 池田 潔
    顎顔面補綴, 26, 1, 28, 35, (一社)日本顎顔面補綴学会, Jun. 2003
    English, 著者等はセンサブルテクノロジー社製の感触モデリングシステムに着目した.このシステムは,フォースフィードバックを有する感触デバイスPHANToMと三次元CADソフトFreeFormから構成されており,触覚に関して対話性の高いインターフェイスを有している.三次元CAD上で自由にモデルを触ったり動かすことができるようになったため,二次元のスライス画像上で処理を行うのではなく,三次元的に金属アーチファクトを判別し除去することができるようになった.実際に感触モデリングシステムを用いてみた結果,金属アーチファクトを除去して頭蓋模型データを構築するのには極めて有効であり,処理時間の短縮にもなることが確認された
  • A New Method of Removing Metal Artifacts from 3D-CT Data for Rapid Prototyping
    H. Aita; Y. Ueda; K. Okuda; N. Ohata; N. Inoue; H. Kobayashi; K. Ikeda
    Maxillofacial Prosthet, 26, 1, 28, 35, 01 Jun. 2003, [Peer-reviewed]
    English, Scientific journal
  • 傾斜機能型デンタルポストの応力緩和効果
    亘理文夫; 松尾晋吾; 佐藤範幸; 上田康夫; 大畑昇
    傾斜機能材料論文集, 2002, 93, 97, 31 Mar. 2003
    Japanese
  • ヒト歯根膜細胞のrhBMP-2に対する走化性について
    請川 哲也; 滝田 裕子; 鵜野 慶治; 佐藤 範幸; 上田 康夫; 大畑 昇; 水野 守道; 久保木 芳徳
    Journal of Hard Tissue Biology, 11, 3, 124, 125, 硬組織再生生物学会, Mar. 2003
    Japanese
  • 咬合高径の改善により舌痛の軽減を見た症例
    上田 康夫
    日本補綴歯科学会雑誌, 47, 1, 187, 187, (公社)日本補綴歯科学会, Feb. 2003
    Japanese
  • Application of Marching-Cubes algorithm to Voxel Formed STL data for fabricatiohn of surgical simulation skull model
    Yasuo Ueda; Sintaro Tamura; Takaaki Ninomiya; Hideki Aita; Noboru Ohata; Yosiaki Satoh; Kazuhiro Oui; Noboru Inoue
    Maxillofacial Prosthet, 26, 2, 55, 61, (一社)日本顎顔面補綴学会, 2003, [Peer-reviewed]
    English, Scientific journal, 著者等は1988年頃より,CTやMRIのデータをもとに積層造形法(ラピッドプロトタイピング/RP)を用いた手術シミュレーション用頭蓋骨模型の作製に関する研究を行ってきた.そして,既にRPのために,骨の形状データをソリッドモデル化するためのデータ構造としてVoxel Formed STL形式を提案してきた.そこで,更にこれを改良して,ボクセルモデル特有の階段状の段差形状を抑制するためにマーチンキューブアルゴリズムを適用すると共に,これによって生成されるデータ量の確認を行った
  • Application of Tree-dimensional Haptic Interface Technology in Dentistry -Virtual Waxing Up-
    Aita Hideki; Ueda Yasuo; Kasai Nobuyuki; Okuda Kouiichi; Ninomiya Takaaki; Ohata Nooboru; Kobayashi Hiromi; Ikada Kiyoshi
    Prosthodont Res Pract, 2, 1, 88, 93, Japan Prosthodontic Society, 2003, [Peer-reviewed]
    English, Scientific journal, Purpose : This paper proposes the application of haptic modeling to a virtual waxing-up system to be used for dental education and dental CAD systems.
    Materials and Methods : A mandibular right first molar model was selected from the tooth crown model data library we had previously created from the three-dimensional coordinate data of plaster models enlarged four times. After partially damaging the occlusal surface shape of the tooth model, we reconstructed its original shape using a haptic modeling system consisting of a haptic force feedback device called the PHANToM® and 3D modeling software called FreeForm®.
    Results : The FreeForm modeling system enables easier control of the functional shape of the occlusal surface than previous modification methods that handled the control points of various free-form surfaces with the 2D mouse. Additionally, the haptic interfaces were extremely useful for resolving visual ambiguities ; the sense of touch led to greater accuracy.
    Conclusion : We affirmed that the use of this haptic modeling system can provide a significant benefit to dental education and dental CAD systems.
  • A novel method to evaluate changes of the shape of masticatory-muscle region : Superimposition of 3D-CT data
    NINOMIYA Takaaki; UEDA Yasuo; OKUDA Kouichi; OHATA Noboru; INOUE Nobuo
    北海道歯学雑誌, 23, 2, 270, 276, 15 Dec. 2002, [Peer-reviewed]
    Japanese, Scientific journal
  • 術後補綴を想定し外科的矯正治療を行った症例
    奥田 耕一; 笠井 信行; 和田 あや; 高道 理; 大畑 昇; 山本 隆昭; 飯田 順一郎; 井上 農夫男; 尾田 充孝; 山口 博雄; 佐久間 孝二
    日本顎変形症学会雑誌, 12, 3, 166, 166, (NPO)日本顎変形症学会, Dec. 2002
    Japanese
  • 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
    日本顎変形症学会雑誌, 12, 3, 147, 148, (NPO)日本顎変形症学会, Dec. 2002
    Japanese
  • Evaluation of the dental cavity preparation in tooth cutting simulator, Decs/2
    TOMATSU Takafumi; HAYASHI Toyohiko; NAKAMURA Yasuo; OTSUKI Masayuki; AIDA Hidenori; UEDA Yasuo
    IEICE technical report. ME and bio cybernetics, 102, 481, 25, 28, 一般社団法人電子情報通信学会, Nov. 2002, [Peer-reviewed]
    Japanese, Scientific journal, Currently, it is getting difficult to obtain extracted teeth used for cutting training of dental students, due to the improvement of oral hygiene and dental treatments. To cope with such situation, a virtual reality-based tooth-cutting simulator has been developed. This simulator is not necessarily suitable for cutting training of many dental students, due to its high cost. Then, we developed a personal computer-based simulator, Decs/2, which enables us to practice the preparation of dental cavities. This paper describes its subsystem capable of evaluating a prepared dental cavity in comparison with its reference. Each voxel of the prepared tooth model was evaluated into 5 categories such as "normal", "excessive" and "insufficient". Such evaluation was visualized in a 3-D presentation and a 2-D cross-section of the prepared tooth model by using pseudo-color, enabling us to visually check improperly prepared portions of the tooth.
  • 著しい片側性きょう状こう合を伴う上顎前突症の1例
    佐藤嘉晃; 山本隆昭; 今井徹; 上田康夫; 大畑昇; 尾田充孝; 戸塚靖則; 井上農夫男; 飯田順一郎
    日本顎変形症学会雑誌, 12, 1, 24, 32, (NPO)日本顎変形症学会, 15 Apr. 2002
    Japanese, 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
  • A Case of Skeletal Class II Malocclusion with Severe Unilateral Scissors Bite
    SATO YOSHIAKI; OHATA NOBORU; ODA MITSUTAKA; YAMAGUCHI HIRO-O; TOTSUKA YASUNORI; INOUE NOBUO; IIDA JUNICHIRO; KUSAKABE TOYOHISA; KAJII TAKASHI; YAMAGATA SYUICHI; YAMAMOTO TAKAAKI; IMAI TOHRU; UEDA YASUO; OKUDA KOUICHI; TAKAMICHI OSAMU
    The Japanese Journal of Jaw Deformities, 12, 1, 24, 32, 特定非営利活動法人 日本顎変形症学会, 2002, [Peer-reviewed]
    Japanese, Scientific journal, A 33-year-old female had a class II malocclusion with a severe unilateral scissors bite. Initial records showed the overerupted upper left premolars and molars, and lingo-inclined lower left premolars and molars. The lower first molars and the second molar of the right side were missing. The upper left molars impinged on the buccal gingiva of the lower arch in habitual occlusion. She also complained of difficulty of closing her lips. Orthodontic treatment followed by surgical procedures was performed. Extraction of the upper first premolars was performed at first for the elimination of crowding in the upper arch, and then one of these teeth was transplanted to the lower right posterior segment as the orthodontic anchor. After the alignment of the upper arch, the upper left posterior segmental osteotomy and the lower left posterior segmental corticotomy were performed for the correction of the scissors bite. The lower left posterior segment was expanded buccally after surgery, and then the upper and lower anterior segments were retracted orthodontically. Finally fairly good functional occlusion was obtained, and her lips could be competent at rest.
  • Reconstruction of Masseter Muscle Model from 3D-CT Data
    Ninomiya, T; Ueda, Y; hata, N
    北海道歯学雑誌, 22, 2, 123, 132, 15 Dec. 2001, [Peer-reviewed]
    Japanese, Scientific journal
  • 三次元顎顔面骨立体模型を用いた顎矯正手術のシミュレーション 骨延長法を適用した骨格性側方開咬の症例
    大井 一浩; 井上 農夫男; 谷村 幸広; 尾田 充孝; 山口 博雄; 戸塚 靖則; 山本 隆昭; 上田 康夫; 大畑 昇
    日本口腔外科学会雑誌, 47, 13, 924, 924, (公社)日本口腔外科学会, Dec. 2001
    Japanese
  • 三次元CTデータからの咬筋モデルの作製(Reconstruction of Masseter Muscle Model from 3D-CT Data)
    二宮 隆明; 上田 康夫; 大畑 昇
    北海道歯学雑誌, 22, 2, 123, 132, 北海道歯学会, Dec. 2001
    English, surface dataを生成する方法を検討し,軟組織の形態を評価するための基礎として,咬筋を抽出することを試みた.咬筋とその周囲の各ボクセルのCT値と座標を詳細に検討し,そのCT値を15〜95とした.抽出方法は以下の通りである.1)注目点のボクセルのCT値が筋組織の値の範囲内にある.2)注目点のボクセルに対し三次元的な周囲26近傍のボクセルの中で注目点を通り対称の位置にあるボクセル対(13通り)を考え,そのうち一方のCT値が筋組織を示す値の範囲内に含まれかつ他方がそれ以外の値をとるようなボクセル対が一つでも存在する.結果は以下の通りである.1)本方法では,咬筋の境界は幅を持った線として抽出され,原画像と比較して,その外周はほぼ適正と思われた.2)近似したCT値を持ち近接する耳下腺との境界は,比較的明瞭に示された.3)咬筋の境界は部分的に骨周囲を誤って抽出した.4)前頭面画像において,本方法では境界は,つながった線として抽出された.5)本方法は,従来法よりも約20%処理に多くかかったが,100秒を越えるものではなかった.今回用いた方法では,パーソナルコンピュータ上で半自動的に境界が検出され,得られたデータは,手作業によるデータの修正なしに上下スライス間の連続性を保っており,従来法と比べてトータルのデータ処理時間を大幅に短縮できた.又,得られたデータから,咬筋及び咬筋付き頭蓋骨模型を作製できた
  • A new method of generating data from three dimensional CT to creat surgical simulation models using rapid prototyping technology
    UEDA Yasuo; AITA Hideki; NINOMIYA Takaaki; SATOH Noriyuki; OKUDA Kouichi; TAKAMICHI Osamu; OHATA Noboru; SATO Yosiaki; OUI Kazuhiro; ODA Mitsutaka; YAMAGUCHI Hiro-o; INOUE Nobuo
    顎顔面補綴, 第24巻, 第2号, 47, 54, 01 Dec. 2001, [Peer-reviewed]
    Japanese, Scientific journal
  • 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, 11, 2, 115, 115, (NPO)日本顎変形症学会, Aug. 2001
    Japanese
  • Development of Dental Cutting Simulator, Decs/2, Equipped with All Tooth Models
    TOMATSU Takafumi; HAYASHI Toyohiko; NAKAMURA Yasuo; OTSUKI Masayuki; AIDA Hidenori; UEDA Yasuo
    IEICE technical report. ME and bio cybernetics, MBE2001-7, 93, 45, 52, 一般社団法人電子情報通信学会, May 2001, [Peer-reviewed]
    Japanese, Scientific journal, The extracted teeth for cutting training of the students in department of dentistry are difficult to obtained, due to the improvement of oral hygiene. Therefore, a tooth-cutting simulator was developed, in order to compensate for actual cutting training. This virtual reality-based system, however, is still very expensive, it is not suitable for the practice in dental school which needs a lot of systems. To improve this problem, we have developed a personal computer-based simulator, Decs/1, which enables us to practice the making the dental cavities. The previous only allows cutting the first molar tooth from occlusal surface direction only. In order to extend the function, Decs/2 has been developed. The all tooth were modeled in solid model on the new system. And also, Decs/2 is capable of cutting any tooth from its side.
  • A Study of the Discrepancy in Upper and Lower Basal Arch Widths Related to Inclination of the Upper and Lower Molars in Jaw Deformity Patients
    SATO YOSHIAKI; OHATA NOBORU; ODA MITSUTAKA; YAMAGUCHI HIRO-O; TOTSUKA YASUNORI; INOUE NOBUO; YAMAGATA SYUICHI; OKAMOTO TORU; YAMAMOTO TAKAAKI; IMAI TOHRU; IIDA JUNICHIRO; UEDA YASUO; OKUDA KOUICHI; TAKAMICHI OSAMU
    The Japanese Journal of Jaw Deformities, 11, 1, 21, 28, 特定非営利活動法人 日本顎変形症学会, 2001, [Peer-reviewed]
    Japanese, Scientific journal, There have been many studies on orthognathic surgery of class III patients with mandibular excess. In such patients, it is necessary to achieve the proper transverse relationship between the upper and lower jaws, as well as incisors, in the upright position, and alignment of both arches before surgery. However, it is difficult to diagnose discrepancies in transverse widths related to the inclinations of the upper and lower molars. The purpose of this study was to determine the proper transverse relationship by evaluating basal arch width discrepancies.<BR>Ten patients were diagnosed as skeletal class III characterized by mandibular excess. They underwent presurgical orthodontic treatment, with extraction of bilateral upper first premolars, to reduce the labial inclination of the upper incisors, and to obtain an adequate basal arch width relationship between the mandible and maxilla. Then they were treated by bilateral sagittal split ramus osteotomy and postsurgical orthodontic correction. Lateral cephalometric radiographs before and after orthognathic surgery (T1 and T2, respectively) were used for Wits appraisal. Dental models were also taken before and after orthognathic surgery. Measurements in dental models included 1) bucco-lingual inclinations of the upper and lower first molars to the occlusal plane, and 2) transverse widths of the upper and lower basal bones (basal arch width).<BR>Improved transverse relationships between the mandible and maxilla were achieved in all cases after treatment, although three of the ten cases showed crossbite on the first molars after orthognathic surgery. Inclinations of the upper or lower molars are correlated with discrepancy in the basal arch widths between upper and lower jaws. Discrepancy in the basal arch widths less than -0.5mm (minus means the lower jaw is wider than the upper jaw) has limited the position of the first molars in the proper bucco-lingual relationship.
  • Effects of mechanical stress on the expression of type XII collagen mRNA in human periodontal ligament cell
    Keiji UNO; Yoshihiro ABIKO; Hiroko TAITA; Tetuya; UKEGAWA; Noriyuki SATOH; Yasuo UEDA; Noboru OHATA; Tohru KAKU; Yoshinori KUBOKI
    Journal of Hard Tissue Biology, 10, 2, 116, 122, 日本硬組織研究技術学会, 2001, [Peer-reviewed]
    English, Scientific journal, The aim of this study is to analyze the effect of mechanical stress on the formation and maintenance of the periodontal ligament(PDL). Type XII collagen was chosen as a characteristic marker of extracellular matrix, together with three other noncollagenous proteins, osteopontin, osteonectin and osteocalcin. Human PDL cells were cultured and subjected to intermittent tensile stress using a Flexercell Strain Unit^(1/20Hrz, 18% elongation for 1, 3, 5 or 7days). By the RT-PCR method with a LightCycler^ mRNAs of these proteins were quaentitatively analyzed. It was found that the mRNA expression of collagen XII, osteocalcin and osteonectin was increased by the mechanical stress in a time-dependent manner, wheres no significant change of mRNA of osteopontin did not observed. The results suggested that intermittent stress positively contributes to the formation and maturation of PDL cells to form the PDL.
  • A new function for use in three-dimensional computer-aided design of a tooth crown
    Yasuo Ueda; Hideki Aita; Noboru Ohata
    Hokkaido Journal of Dental Science, 21, 1, 53, 58, 15 Jun. 2000, [Peer-reviewed]
    English, Scientific journal
  • A study on the rapid prototyping method making a highly precise model for surgical simulation : The examination of processing metal artifact
    UEDA Yasuo; AITA Hideki; NINOMIYA Takaaki; KAWADA Tomohisa; IMAI Makoto; OKUDA Kouiti; TAKAMITI Osamu; OHATA Noboru
    北海道歯学雑誌, 21, 1, 144, 151, 15 Jun. 2000, [Peer-reviewed]
    Japanese, Scientific journal
  • 3次元CADのための歯冠形態設計用形状表現関数に関する検討
    上田 康夫; 会田 英紀; 大畑 昇
    北海道歯学雑誌, 21, 1, 53, 58, 北海道歯学会, Jun. 2000
    English, 特殊な指数関数の一種を,微妙な形状をコントロールする専用の関数として提案した.歯冠形状の表現法は,基本となる有理ベジエ曲面モデルに手を加えず,局所の微妙な形態の表現には,この関数により生成される形状を付加していく方法とした.結果として,この関数の指数部の値が,2.0〜2.6の間においては,有効な形状のコントロールが得られることが確認できた
  • 光造型法を応用した審美補綴物作製の試み CAD/CAMによる積層法からのアプローチ
    佐藤範幸; 松尾晋吾; 上田康夫; 依本卓見; 会田英紀; 大畑昇; 亘理文夫
    Quintessence of Dental Technology, 25, 4, 463, 469, クインテッセンス出版(株), 10 Apr. 2000
    Japanese
  • 光造形法を応用した審美補綴物作製の試み−CAD/CAMによる積層法からのアプローチ−
    Quintessence of Dental Technology, 25, 4, 17, 23, 2000
  • Firing Shrinkage of Porcelain-resin Composites Prepared by Laser Lithography
    Noriyuki Satoh; Yasuo Ueda; Takumi Yorimoto; Hideki Aita; Shingo Matsuo; Noboru Ohata; Fumio Watari
    Dental Materials Journal, 18, 4, 444, 452, Japanese Society for Dental Materials and Devices, 1999, [Peer-reviewed]
    English, Scientific journal
  • A Study on Creating the Tooth Crown Basic Models Used in CAD System for Crown Restorations : Part 2 The Creation of the Tooth Crown Basic Models of Anterior Teeth
    AITA Hideki; UEDA Yasuo; YORIMOTO Takumi; HIKITA Kazuhiro; OHATA Noboru; UCHIYAMA Yoichi
    Nihon Hotetsu Shika Gakkai Zasshi, 42, 5, 832, 838, 社団法人 日本補綴歯科学会, Oct. 1998, [Peer-reviewed]
    Japanese, Scientific journal, For the past 10 years, we have been engaged in research on development of CAD/CAM system for prosthetic restoration such as crown and bridge in molar teeth. In order to apply this system to anterior teeth, it is necessary to create the crown basic model data of the anterior teeth. The purpose of this study was to complete a library of basic crown model data of all teeth for the CAD system.<BR>The results were as follows:<BR>1. By dividing the incisal edge or the cuspid into a grid pattern, solid models of anterior teeth represented by bicubic Bezier surfaces were made from three-dimensional coordinate data of four-fold enlarged plaster models measured from five directions.<BR>2. In order to represent the coronal anatomical features of the anterior teeth, it was necessary to divide the four-fold enlarged models into more than 104 Bezier surfaces, and the real size models into more than 43 Bezier surfaces.<BR>3. The results suggested that consideration of the functional crown forms of the natural teeth may be necessary to decide the most suitable surface for basic crown models.
  • Structure of Tooth and Treatment of Caries
    UEDA Yasuo
    Journal of Japan Foundry Engineering Society, 70, 3, 219, 222, 公益社団法人 日本鋳造工学会, Mar. 1998, [Invited]
    Japanese, I describe inside construction with development of tooth, treatment with crown restoration of caries of the teeth, and new technology and expected materials in the future.
  • A Study on Creating the Tooth Crown Basic Models Used in CAD System for Crown Restorations : The Creation of the Tooth Crown Basic Models of Molar Teeth
    AITA Hideki; UEDA Yasuo; YORIMOTO Takumi; HIKITA Kazuhiro; UCHIYAMA Yoichi
    Nihon Hotetsu Shika Gakkai Zasshi, 41, 5, 787, 795, 社団法人 日本補綴歯科学会, Oct. 1997, [Peer-reviewed]
    Japanese, Scientific journal, In recent studies of CAD/CAM systems for crown restorations, the quantity of data of the basic model has been reduced to a minimum to transform three-dimensional shapes quickly. As a result, there is no model to represent a detailed tooth crown form like an occlusal surface. The purpose of this study was to create a tooth crown model showing minute coronal features. The results were as follows.<BR>1. By dividing the occlusal surface into a grid pattern, solid models of molar teeth represented by bicubic B&eacute;zier surfaces were made from three-dimensional coordinate data of four times enlarged plaster models measured from five directions.<BR>2. In order to represent the minute occlusal surface shapes of the molar teeth, it was necessary to divide the occlusal surfaces of the four times enlarged models into more than 1, 024 B&auml;zier surfaces, and the occlusal surfaces of the actual size models into more than 256 B&auml;zier surfaces.<BR>3. In the premolar teeth, it was necessary to divide the occlusal surfaces of the four times enlarged models into more than 256 B&eacute;zier surfaces, and the occlusal surfaces of the actual size models into more than 64 B&eacute;zier surfaces.<BR>4. Topological structure models may represent minute shapes efficiently with little data.
  • A Study of Computer Aided Design System for Tooth Crown Form
    Ueda Yasuo
    The journal of the Japan Prosthodontic Society, 40, 5, 993, 1003, 社団法人日本補綴歯科学会, Oct. 1996, [Peer-reviewed]
    Japanese, Scientific journal, The introduction of CAD/CAM technology was tried for the improvement of the quality of prosthetic restoration and of efficiency of the dental technician's work. In this study, CAD was examined as a method for prosthetic restoration, and as a result, the conclusions were as follows : 1. In order to design a tootla crown form by computer, it was necessary to freely treat a tooth crown form that has a complex three-dimensional freedom curved surface. 2. For this purpose,voxel model,spline model,and rational bezier model were examined. The data of the voxel model was easy to treat but difficult to transform effectively, and the problem there of was the quantity of data increased xvhen the surface was smoother. In case of the rational bezier model, it was possible to transform the model according to expectation. 3. As one method of transformation of the tooth crown form using rational bezier surface, it was advantageous to transform without chau?ging the control points by changing the weight-parameters. 4. The CAD system for prosthetic restoration was based on MCCM-solid-model using rational bezier surface, and it was found to be possible to make the prosthetic restoration in this CAD system like those made in dental technical work.
  • Clinical application of skull models fabricated by CAD/CAM technology to maxillofacial prosthetics and reconstructive surgery
    Noboru Ohata; Yasuo Ueda; Yoichi Uchiyama
    Hokkaido J Dent Sci, 16, 123, 129, 1996, [Peer-reviewed]
    English, Scientific journal
  • Application of Laser Lithography Technology to Dentistry. Modeling of the Range of Mandibular Border Movements.
    小松孝雪; 上田康夫; 内山洋一; 山口泰彦
    日本コンピュータ支援外科学会会誌, 3, 1, 1, 8, Jun. 1995, [Peer-reviewed]
    Japanese, Scientific journal
  • Analyses of stress during occlusal contact by "Dental Prescale" : A study of left and right side balance of occlusal contact pressure
    KIMURA Tomoyoshi; SATOH Kaoru; IMAGAMI Takehiko; KOJIMA Kazunori; NAGAO Yoshinori; ISHIYAMA Tsukasa; KOMATSU Kosetsu; UEDA Yasuo; UCHIYAMA Yoichi; YAMAGUCHI Taihiko
    北海道歯学雑誌, 16, 1, 12, 19, Jun. 1995, [Peer-reviewed]
    Japanese, Scientific journal
■ Other Activities and Achievements
■ Books and other publications
  • クラウンブリッジ補綴学 第６版
    矢谷, 博文; 井川, 知子; 三浦, 宏之; 細川, 隆司; 小川, 匠; 木本, 克彦; 松香, 芳三
    医歯薬出版, Feb. 2021, 9784263458563, xiv, 369p, Japanese, [Contributor]
  • 「クラウンブリッジ補綴学」第５版
    山口 泰彦; 上田 康夫, 第６章 Ⅴ［１］従来型ブリッジ
    医歯薬出版, 2014, [Contributor]
  • 歯科技工学電子辞書 Ver.1 「歯科技工学用語集」 日本歯科技工学会 編纂
    上田 康夫
    医歯薬出版, 2012, [Contributor]
  • 歯科技工学用語集（日本歯科技工学会編）
    上田 康夫
    医歯薬出版, 2011, [Contributor]
  • 「クラウンブリッジ補綴学」第４版
    大畑 昇; 上田康夫, 第３章 Ⅳ 連結法
    医歯薬出版, 2009, [Contributor]
  • コンピュータシミュレーション外科
    藤野豊美; 編; 内山洋一; 上田康夫, 第21章 歯科領域におけるコンピュータ利用技術の応用
    南山堂, 1996, [Contributor]
■ Lectures, oral presentations, etc.
■ Syllabus
  • インプラント歯科学, 2024年, 博士後期課程, 歯学院
  • インプラント歯科学, 2024年, 博士後期課程, 歯学院
  • 発表・論文執筆法演習Ⅰ, 2024年, 博士後期課程, 歯学院
  • 発表・論文執筆法演習Ⅱ, 2024年, 博士後期課程, 歯学院
  • 発表・論文執筆法演習Ⅲ, 2024年, 博士後期課程, 歯学院
  • CAD/CAM研究Ⅰ, 2024年, 博士後期課程, 歯学院
  • CAD/CAM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
  • 歯科補綴材料学研究Ⅰ, 2024年, 博士後期課程, 歯学院
  • 歯科補綴材料学研究Ⅱ, 2024年, 博士後期課程, 歯学院
  • 冠橋義歯補綴学, 2024年, 博士後期課程, 歯学院
  • 冠橋義歯補綴学, 2024年, 博士後期課程, 歯学院
  • コンピューター技法, 2024年, 博士後期課程, 歯学院
  • 歯科学概論Ⅰ, 2024年, 学士課程, 歯学部
  • 基本技術実習, 2024年, 学士課程, 歯学部
  • 冠・橋義歯補綴学基礎実習, 2024年, 学士課程, 歯学部
  • 冠・橋義歯補綴学臨床実習Ⅰ, 2024年, 学士課程, 歯学部
  • 冠・橋義歯補綴学臨床実習Ⅱ, 2024年, 学士課程, 歯学部
  • 冠・橋義歯補綴学, 2024年, 学士課程, 歯学部
  • 健康と社会, 2024年, 学士課程, 全学教育
  • 歯科学, 2024年, 学士課程, 医学部
■ Affiliated academic society
  • 日本生体医工学会
  • 日本口腔顎顔面技工学会
  • 日本歯科理工学会
  • 日本顎顔面補綴学会
  • 日本補綴歯科学会
  • Japanese Academy of Maxillo
  • Japanese Society for Medical and Biological Engineering
  • Information Processing Society of Japan
  • The Japanese Society of Precision Engineering
  • The Japanese Society of Dental Materials and Devices
  • Japan Prosthodontic Society
  • 日本デジタル歯科学会
■ Research Themes
  • Dental CAD/CAM revolution by introducing AM technology to make zirconia crown - Challenge to condition optimization -
    Grants-in-Aid for Scientific Research
    01 Apr. 2021 - 31 Mar. 2024
    上田 康夫; 山口 泰彦
    初年度は，CADソフトウェアとしてAutodesk社のFusion360を導入し，脱脂・焼成の確認用サンプルとしての円盤状のものを，また後の試験を想定したJIS規格試験片の形状の試作サンプルなどの設計を行った．適合の精度を検証するクラウン形状のものは，円盤形状のもののテストが進んでから行うことにした．設計終了後は，当初の計画では，自力での3Dプリントは困難であると考え，順次，外注により産業用機器でプリント（成形），脱脂，焼結を行う想定だったが，手許に導入していた小型の光造形式3Dプリンタを利用して，材料の調整とプリント時の成形条件を様々にテストした結果，ジルコニア粉末と紫外線硬化レジンの配合比率が1:1程度で，プリント（成形）してグリーン体の製作をすることが可能になった．初年度は62個のプリントを完了したが，設計サイズと成形体のサイズにズレがあるため，加工条件と対比しながら状態の確認作業を続けている．また，成形物は予備実験として一部脱脂工程をテストしており，400℃，1時間程度で肉眼的には脱脂できているように見られることから，次年度にはその周囲の条件から確認を進めていく予定である．当初計画では，形状再現性と精度，歯冠形状のものの支台歯への適合性なども確認する予定だったが，これらについてはまだ実施できていない．成形体の製作は，初年度のべ100個の想定に対し現状は62個であったが，製作工程がある程度確立できたので，次年度は数百個程度の試作を行える見通しがついた．
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 21K09991
  • Challenge to optical impression method of abutment-tooth under the gingiva - Application of near-infrared light diffusion simulation -
    Grants-in-Aid for Scientific Research
    01 Apr. 2015 - 31 Mar. 2018
    UEDA YASUO; TAGUCHI Yuu
    We investigated the use of near infrared as a method to capture the part that can not be measured with the intraoral scanner. Instead of soft tissue, we wrapped raw ham around abutment teeth made by melamine resin. Light scattered inside the resin tooth was imaged with an infrared camera installed at a position orthogonal to the incident light axis. The margin shape of the abutment tooth was generated by analyzing the pixel value of the fluoroscopic images. But, the shape that can be generated had a error with respect to the depth direction of the image, which was considerably shifted from the original shape. In order to generate a more accurate shape, it is considered necessary to increase the amount of information, review the intensity of light, direction of irradiation and imaging direction, narrow down the search area in consideration of the shape of the preparation tools.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 15K11143
  • REAL-TIME ANALYSIS OF BIOMOLECULAR ADSORPTION AND CELLULAR ADHESION ON LIGHT-INDUCED SUPERAMPHIPHILIC TITANIUM SURFACE
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    2008 - 2010
    OHATA Noboru; AITA Hideki; UEDA Yasuo; OGAWA Takahiro; SAKATA Miyuki
    The purpose of this study was to investigate the real-time adsorption behavior of biological molecules and osteogenic cells on a light-induced superamphiphilic titanium surface using a quartz crystal microbalance(QCM). We showed the potential usefulness of QCM in elucidating the sequential interaction of biological molecules and cells with the tissue-material interface at the molecular level. The results suggest that photofunctionalization of Ti boosts the initial adsorption rate and increases the adsorptive capacity.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, Coinvestigator, 20592253
  • Construction of 3D shape database of auricle ear for making prothesis
    Grants-in-Aid for Scientific Research
    2006 - 2007
    UEDA Yasuo; AITA HIDEKI; NISHIKAWA KEIGO
    The purpose of this study is the construction of three dimensional auricular shape database.
    (1) Extraction, collection, and analysis of auricular shape data
    It was possible to collect about 130 pieces of auricular shape data extracting from volume data of 3-D CT.
    (2) Construction of 3-D shape database
    Three dimensional shape database that was required to make auricular prosthesis was constructed. Auricle model in the database contained the internal structural data that was based on the voxel model.
    (3) Examination of materials and making of prosthesis for trial purposes
    Auricular prosthesis was made for patient using shape data base. We used the rapid prototyping technology to make the auricular model instead of wax up. In addition, with the proposal of the plastic surgeon, the template for the auricle reconstruction operation was made. As the materials, we examined the silicone and the polyurethane.
    (4) Examination of problem for practical use
    It was thought that the development of CAD software to practical use was necessary. It will need to be able to operate the shape of the data base easily. It will need to be able to synthesize the shape of auricle data to the patient's photograph of face. And it will need to be able to confirm the result of simulation easily.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, Principal investigator, Competitive research funding, 18592106
  • A study on a development of a virtual simulator for dental education using the 3-D haptic modeling system
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    2001 - 2002
    AITA Hideki; KOMATSU Kousetu; SATHO Noriyuki; UEDA Yasuo; SATHO Kaoru
    This study tried to apply the haptic modeling system to a virtual simulator for dental education.
    In the dental clinical field, the sense of touch is considered most important for the mastery of various treatment techniques ; all dental school students are practiced in dentistry skills, such as tooth preparation, cavity filling, taking impressions, occlusal adjustments. Especially in prosthetic dentistry education, the fabrication of prostheses is regarded as a fundamental technique, and requires considerable class time for practical training.
    In virtual reality technologies, accommodating the sense of touch has been behind the practical use, and compares with the other senses such as vision and hearing. We focused on the haptic modeling system, the fundamental technology of which has been developed at the Massachusetts Institute of Technology Artificial Intelligence Lab. The haptic interface has a good quality of human-computer interaction by accommodating our sense of touch, so its use has spread not only in the field of the industrial design but also in the medical.
    First, we tried to simulate a process of waxing up utilizing a virtual reality system. The FreeForm modeling system enables easier control of the functional shape of the occlusal surface than former modification methods of handling control points of various free-form surfaces with the 2D mouse. Additionally, the haptic interfaces were extremely useful for resolving visual ambiguities ; the sense of touch leading to greater accuracy. Next, we tried to apply this system to the modification of an individual craniofacial bone model for surgical simulation. As a result, a haptic modeling system provided a significant benefit for removing metal artifacts, and reduced the amount of time required for modeling and modification.
    We affirmed that the use of this haptic modeling system provides significant benefit for dental education.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), HOKKAIDO UNIVERSITY, Coinvestigator, 13672019
  • An Application Study of Rapid Protetyping Technology for Dental Science
    Grants-in-Aid for Scientific Research
    1999 - 2002
    UEDA Yasuo; SATOH Noriyuki; OKUDA Koiti; OSAMU Takamiti; AITA Hideki
    The purpose of this study is a making application of rapid prototyping technology far dental fields. We considered two applications, one is a process technology of dental CAD/CAM system and the other is a real model of patient based on 3D-CT data for surgical simulation.
    In the former, we tried to made a crown using ceramics powder. A powder mixed with resin by the various ratio was burned. But, it was difficult to control of shape with the volume shrinkage at burning. After all we could not have technical canviction and break through. On the other hand, molding of metal by titanium began to progress by the industrial world and a university. As for titanium, there is the possibility that can be applied in the living body directly. Then we continue to collect more information.
    In the latter, we suggested Voxel Formed STL format as the technique that data of 3D-CT were converted into STL data easily for the rapid prototyping. We interpolated by 3 dimensional Bi-Cubic method for all the volume of 3D-CT data, and it is possible for controlling deficit of shape in the details furthermore. As a result, when size of 1 Voxel did it in 0.25(W) ^*0.25(D) ^*0.50(H)mm, we could make a model for praetical surgical simulation. About soft tissue, process became possible only masseter muscle. We think it need to recognize and to extract organizations more easily in future. So, we try domain expansion method, and we will continue to examine this successively after this subject came to an end.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, Principal investigator, Competitive research funding, 11470409
  • Fabrication of cranio-facial soft tissue model by rapid prototyping and its clinical application.
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    2000 - 2001
    OKUDA Kouichi; AITA Hideki; YORIMOTO Takumi; UEDA Yasuo; SATOH Yoshiaki; YAMAGICHI Hiro-o
    1. Objective
    Orthognathic surgery has been widely performed to improve function and esthetics of patients suffering from jaw deformity. We have applied rapid prototyping (RP) technology to fabricate 3-dimensional cranio-facial bone models from 3D-CT data and the models have been used for presurgical simulation. However, post-operative relapse usually takes place due to tension from distorted soft tissues and muscles. Therefore, the purpose of this study was to fabricate simulation models including soft tissue in order to evaluate soft tissue change before and after surgery.
    2. Materials and Methods
    The masseter was modelled because masticatory muscles, especially the masseter, are supposed to have strong influence on postoperative relapse. Among patients underwent sagittal split or vertical ramus osteotomy, those who met the following criteria were included as subjects ; 1)no maxillary surgery or limited blow the zygomatic and nasal bones, 2)Preoperative CT taken after growth period was over and postoperative CT taken within 6 months after surgery are available. The masseter data was extracted from each CT slice. The long axis of the masseter was defined as a regression line of the center of gravity of the masseter on each slice. The change of the masseter muscle angluation was evaluated by the angle between the reference axes before and after the surgery.
    3.Results
    The long axis of the masseter muscles tended to tilt slightly to the posterior direction after surgery. However, if the technical errors regarding the scanning angle and the reference axes determination are taken into account, it can be concluded that the distortion of the masseter muscles, was minimal. The method used in this study would be inaccurate when the difference between the CT scanning angles taken pre and postoperatively was large. Therefore, in order to evaluate soft tissue changes more accurately, it may be necessary to strictly standardize pre and postoperative CT scanning conditions.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, Competitive research funding, 12470410
  • RESEARCH FOR DEVELOPMENT OF BIOMECHANICAL DENTAL IMPLANT WITH ARTIFICIAL PERIODONTAL LIGAMENT
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    1998 - 1999
    OHATA Noboru; SATOH Noriyuki; WATARI Humio; KUBOKI Yoshinori; UO Motohiro; UEDA Yasuo
    (1)Development Hybrid Type of Periodontal Ligament
    The purpose of this study is to confirm the regeneration in the replanted tooth of Beagle dog by rhBMP-2 combined with ribbon (3 mm width) of fibrous collagen membrane (FCM). Twenty-four premolars of three beagle dogs were carefully extracted after thier root canals were treated. Before replantation their periodontal ligament and cementum were partially removed in a belt-type area (3 mm width) around the middle part of the root, and the denuded areas of root dentin were covered with FCM/rhBMP-2. It was concluded that combination of rhBMP-2 and FCM incduces periodontal ligament and cementum in the replanted tooth.
    (2)Diagnostic Imaging by Radiographs for Periodontal Membrane of Replanted and Transplanted tooth in Human
    We concluded that the normal space of periodontal membrane comfirmed 2-weeks fter the replantation and 4-weeks after the transplantation.
    (3)Periodontal regeneration in replanted tooth in rabit.
    We comfirmed the regeneration of priodontalligament 4-weeks after replantation was equivalent to the control tooth.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), HOKKAIDO UNIVERSITY, 10470411
  • A MOLECULAR BIOLOGICAL INVESTIGATION ABOUT REGENERATION OF PERIODONTAL TISSUE
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    1998 - 1999
    SAITOH Noriyuki; AITA Hideki; UEDA Yasuo
    Mechanical stress is expected to be an effective role for regeneration of periodontal tissue. The effect of mechanical stress for the activity of the periodontal ligament cell was investigated by biochemical approach. Mechanical stress was loaded by Flexercell. The cell number (the amount of DNA), the activity of alkaliphosphatase, the concentration of type I collagen and type XII collagen were selected as biochemical markers. RT-PCR was adopted in the case of alkaliphosphatase, type I collagen and type XII collagen.
    The periodontal ligament cell which was obtained by exfoliation from human extracted premolar tooth due to orthodontic treatment was cultivated in α-MEM cultivator. After third subculture, about one hundred thousand cells were disseminated per one well of Flexercell and stress was loaded to it. 20 seconds was decided as one loading cycle in which 10 seconds for on-stress, the other 10 seconds for off-stress. The expansion rate of cell was 18 %. The term of stress loading was 1, 3 and 5 days. After stress loading, stress loading groups and control groups were compared. The effect of stress loading term was also investigated. The results indicated that the periodontal ligament cell was activated and proliferated by relatively long term stress.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), HOKKAIDO UNIVERSITY, 10671812
  • A STUDY OF CLINICAL APPLICATION OF DENTAL CAD/CAM SYSTEM
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    1997 - 1999
    HIKITA Kazuhiro; KOBAYASHI Kunihiko; YORINOTO Takumi; UCHIYAMA Yoichi; MAIDA Takeo; TANAKA Osamu
    The clinical application was carried out using CAD/CAM systems for crown, and the evaluation of the system was examined. In the measurement of antagonistic tooth, the antagonistic tooth was described by the exclusive black occlusion material. And there was the danger which had designed the crown that it slightly stands out from the model and is higher than the practice, when this was measured. It is considered that on this, it must be also examined that the direct antagonistic tooth model is measured. The data for the processing in which that CAD software becomes more and more practical, and that moreover, the design in the detail easily does it in the short time of 10-20 minutes would be possible was automaticaliy made in 15〜20 minutes. The processing time finished within 60 minutes almost. And, the problem might be also clinically very effective without recognizing especialiy, abutment tooth mounting condition. Using measured data of the abutment tooth, thickness of the crown was continuously measured in addition to each facing tilt angle of meslal-distal axial surface and buccal-lingual side axial surface as an application to the dentistry education in 1998. In the menu of the CAD software, after the formation there is a function which automatically checks the thickness of designed crown, and first the reference value of the thickness of the crown is input, and this function is applied this time abutment tooth data crown external form data reference value screen, and the data of melamine tooth In the before formed as a crown data is registered. Deletion quantity of thickness of the crown was measured by the comparison with the abutment tooth data. In the macroscope, by present evaluation method, It was judged as the result, that the decision became also automatically possible on the deletion shortage of small range with the difficult decision and that the over half of formed abutment tooth is insufficient in the deletion.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Competitive research funding, 09470430
  • 顔面形態の非対称性に対する視覚的な認識に関する研究
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
    1996 - 1997
    高道 理; 上田 康夫; 奥田 耕一
    本研究の目的は、顎変形症疾患の顎を含めた顔面形態の変形を視覚的に認識するために、顔面形態の非対称性の有無について、判断基準を明らかにすることを目的とし、顔面規格撮影装置を用いて撮影した顔面正面写真上で顔面形態を構成する各部位の位置関係を検討した。
    被験者は、顔面形態が非対称と思われる15名の成人を正常者群とし、外科的矯正治療対象者の中で下顎対称と診断された13名を非対称群とした。
    計測箇所としは、顔面正中線は左右内眼角点の上唇点を結ぶ線とし、計測点は左右外眼角点・左右内眼角点・上唇点・鼻下点・口唇交点・下顎下縁部交点(外眼角点と鼻下点を結ぶ直線が下顎下縁部と交わる点)・頬部交点(鼻下点を通り顔面正中線と直交する直線が頬部外縁と交わる点)とした。
    結果:正常者群では、(1)左右外眼角点を結ぶ直線と左右頬部交点を結ぶ直線および外眼角点と下顎下縁部交点を結ぶ直線で囲まれる四角形はほぼ正方形なった。(2)片側の外眼角点と下顎下縁部交点および頬部交点で囲まれる三角形はほぼ二等辺三角となり左右同形となった。(3)左右下顎下縁部交点と上唇点で囲まれる三角形はほぼ二等辺三角形となった。(4)片側の外眼角点と口唇交点との距離は左右ほぼ同じでしかも被験者間でほぼ一定の値を示した。非対称群では、正常者群で示した一定の形は示さず下顎の変位した側へ四角形や三角形がなびく形態となった。
    しかし、非対称群の術後の検討数が少なく、また軽度の非対称の数が少ないため、非対称性の有無の判断基準はまだ得られていない。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 08672221
  • Development of system measuring and analysing teeth crown form using light cutting method for dental CAD/CAM technology
    Grants-in-Aid for Scientific Research
    1996 - 1997
    UEDA Yasuo; KOMATU Kousetu; HIKITA Kazuhiro; SATO Noriyuki
    The purpose of this study is mesurment and analisys tooth crown form and dental arch using digital CCD camera and light cutting method. Moreover we considered measuring the shape of tooth crown form in the mouth directly. At first, we made a special stage with 6 degrees of freedom. Then we examined the methods of measurments using slit light, cross-pattern, and maluti-value pattern, et al. From the result, we decided to use multi slit pattern. This pattern was constituted alternately white line (2 pixels width) and black line (32 pixels width). The image provided using CCD camera was handled by the dynamic threshold value, and it was converted into black and white image, and 3 dimensional value was calculated. Then, we considerd the problems of crook or dim of image coming from focusing in optics system, and concluded that it is easy to measure rough shape, but not enough to do a minute measurement for abutment tooth. If the shape of tooth is mesured directly in the mouth using this method, it is important to make up this system into small size that is possible to insert in a mouth. We think it need the new technology break through the problems.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), HOKKAIDO UNIVERSITY, Principal investigator, Competitive research funding, 08672220
  • A STUDY OF FABRICATION OF CROWNS BY STEREO LITHOGRAPHY
    Grants-in-Aid for Scientific Research
    1995 - 1996
    HIKITA Kazuhiro; KOMATSU Kosetsu; UEDA Yasuo
    The aim of this study is to try fabrication of crowns by laser lithography or machine of computer aided manufacturing. First we studied about processing precision and established the most suitable processing (output power of laser : 13mVV,scan speed : 240mm/s, diameter of laser spot : The 0.2 mm, product layr pace of Z direction : 0.07 mm, scan method : Normal scan). As for data of crowns, we designed full crowns using Dental CAD/CAM system which NIKON co., GC co., HITACHI co.developed. And we input it into a work station for the control of light molding device after having ontput this as Bezie curved surface patch in the cause. And then, we did setting of processing condition, a simulation and made resin model. As the results the manufacturing process that made resin model of crown for abutment tooth in the mouth of real patient was established. A form of crown made reproduced a design of CAD faithfully, too. But what was careless is regarded as future examination subject till the resinous shrinkage rate used adapts it in abutment tooth greatly.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), HOKKAIDO UNIVERSITY, Competitive research funding, 07672102
  • DEVELOPMENT OF THE HUMAN MODEL HIGH SPEED MANUFACTURING PROCESSOR BY THE RAPID-PROTOTYPING TECHNOLOGY THAT USED CT FILM
    Grants-in-Aid for Scientific Research Grant-in-Aid for Developmental Scientific Research (B)
    1994 - 1995
    UCHIMIYA Yoichi; HAYANO Seiji; UEDA Yasuo; HIKITA Kazuhiro; OHATA Noboru
    The development of the living body substance model high speed framing device by the light molding methed that used CT film. It is that the purpose of this studies develops tha device which can make the living body model simply from CT film.
    At first, we digitized CT film and converted it into numerical data, and we got possible to make the living body model when seemed not to be got CT data directly from CT device. Then we compared a model made from CT data with this model. As a result, there are some problems by setting of precision and threshold value of image, but this model is very useful for simulation of simple operation.
    Next, we tried a method to copy 1 slice at a time furthermore.
    So, (1) We developed original software for image processing, and extracted shape of internal organs in the living body from CT film automatically, and established technology to generate data for transcription.
    (2) We changed image from CT film to monochrome, and copyed on film that ultraviolet rays transmit. So, we could make a model by exposured 1 slice at a time.
    In particular, about film for exposure mask, we ware able to confirm that we could utilize extremely cheap materials. But, about a quantity of light and the control of resinous depth to stiffen to transmit film, still many problems.
    Japan Society for the Promotion of Science, Grant-in-Aid for Developmental Scientific Research (B), HOKKAIDO UNIVERSITY, 06557103
  • The relationship between electromyograph and energy metabolism in masseter mucles of TMD patients
    Grants-in-Aid for Scientific Research Grant-in-Aid for General Scientific Research (C)
    1994 - 1995
    YAMAGUCHI Taihiko; KOMATU Kosetu; UEDA Yasuo; MINOWA Kazuyuki; INOUE Nobuo; TOTSUKA Yasunori
    The purpose of this study was to verify the relationship between electromyograph (EMG) and energy metabolism in masseter mucles of TMD patients. The EMG data were compared with energy metabolism data analyzed by 31P-MRS (Magnetic Resonance Spectroscopy).
    The results were as follows ;
    1. Before and after fatigue-loading, the power spectral analysis of EMG showed the similar tendency to 31P-MRS analysis. It was suggested that the power spectral analysis of EMG might reveal the state of muscle fatigue and energy metabolism in masseter muscle.
    2. In the chewing rhythm analysis by EMG,the mean of CV (coefficiency of variation) in TMD patients suffering from pain and contracture of masseter muscles was higher than that in normal subjects. But there was little correlation between the result of CV analysis and that of 31P-MRS analysis.
    3. The mean of interval/cycle time ratio in TMD patients suffering from pain and contracture of masseter muscles was higher than that in normal subjects. The result of interval/cycle time analysis was correlative with the result of energy metabolism analysis by 31P-MRS.
    4. In one TMD patient, 31P-MRS analysis showed improvement of muscle fatigue after treatments, but interval/cycle time ratio was not changed evidently. In this patient, the ratio before treatment was almost in nomal range, because the border of burst was not obvious and the duration of burst was enlarged abnomally. After treatment the border of burst became clear and the burst shape became normal. This results suggest that the analysis of interval/cycle time ratio must be done together with the burst shape analysis.
    Japan Society for the Promotion of Science, Grant-in-Aid for General Scientific Research (C), HOKKAIDO UNIVERSITY, 06671939
■ Industrial Property Rights
  • 歯冠補綴物設計装置
    Patent right, 河合 正治; 三好 勝也; 馬場 真佐美; 内山 洋一; 疋田 一洋; 上田 康夫
    特願平3-218325, 29 Aug. 1991
    特開平5-49651, 02 Mar. 1993