歯冠補綴物のCADシステムに用いる標準歯冠モデルの作成 : 臼歯部の標準歯冠モデルの作成  [in Japanese] 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  [in Japanese]

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Author(s)

    • 会田 英紀 AITA Hideki
    • 北海道大学歯学部歯科補綴学第二講座 Department of Crown and Bridge Prosthodontics,School of Dentistry,Hokkaido University
    • 上田 康夫 UEDA Yasuo
    • 北海道大学歯学部歯科補綴学第二講座 Department of Crown and Bridge Prosthodontics,School of Dentistry,Hokkaido University
    • 依本 卓見 YORIMOTO Takumi
    • 北海道大学歯学部歯科補綴学第二講座 Department of Crown and Bridge Prosthodontics,School of Dentistry,Hokkaido University
    • 疋田 一洋 HIKITA Kazuhiro
    • 北海道大学歯学部歯科補綴学第二講座 Department of Crown and Bridge Prosthodontics,School of Dentistry,Hokkaido University
    • 内山 洋一 UCHIYAMA Yoichi
    • 北海道大学歯学部歯科補綴学第二講座 Department of Crown and Bridge Prosthodontics,School of Dentistry,Hokkaido University

Abstract

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 Bézier 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 Bäzier surfaces, and the occlusal surfaces of the actual size models into more than 256 Bäzier 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 Bézier surfaces, and the occlusal surfaces of the actual size models into more than 64 Bézier surfaces.<BR>4. Topological structure models may represent minute shapes efficiently with little data.

Journal

  • Nihon Hotetsu Shika Gakkai Zasshi

    Nihon Hotetsu Shika Gakkai Zasshi 41(5), 787-795, 1997-10-01

    Japan Prosthodontic Society

References:  23

Cited by:  12

Codes

  • NII Article ID (NAID)
    10008167638
  • NII NACSIS-CAT ID (NCID)
    AN00197911
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    03895386
  • Data Source
    CJP  CJPref  J-STAGE 
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