各種歯冠修復用被削材を用いたCAD/CAMの加工精度  [in Japanese] Working Accuracy of CAD/CAM Crown Restorations with Material Cuts  [in Japanese]

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Author(s)

    • 伊藤 道博 ITO Michihiro
    • 日本歯科大学歯学部歯科補綴学教室第2講座 Department of Crown and Bridge, The Nippon Dental University School of Dentistry at Tokyo
    • 新谷 明喜 SHINYA Akiyoshi
    • 日本歯科大学歯学部歯科補綴学教室第2講座 Department of Crown and Bridge, The Nippon Dental University School of Dentistry at Tokyo
    • 横塚 繁雄 YOKOZUKA Shigeo
    • 日本歯科大学歯学部歯科補綴学教室第2講座 Department of Crown and Bridge, The Nippon Dental University School of Dentistry at Tokyo

Abstract

The purpose of this study was to investigate the working accuracy of CAD/CAM by probing the surface of the master model abutment, and its effect on the fabricated surface of three materials (titanium, thermosetting resin, and porcelain) cut to make crown and bridge. The master model abutment was measured first, the tool path for the cutting tool to run was produced, and then numerical control fabrication was applied to each material cut to measure it by the Coordinate Measuring Machine. For detailed results, two additional steps were taken and it was concluded that one-way analysis of variance statistically contrasted each measurement to the master model measurement and scanning electron microscopy confirmed eachfabricated surface.<BR>1. Data on one-way analysis of variance<BR>A. Titanium: smaller in the cervical area and larger in the other parts than the master model measurement.<BR>B. Thermosetting resin: all the measured areas were smaller than those of the model except for the height.<BR>C. Porcelain: smaller in the cervical area and larger in the other parts than those of the model.<BR>2. Surfaces confirmed by scanning electron microscopy<BR>A. Titanium:<BR>a. a tool trace on the surface<BR>B. Thermosetting resin:<BR>a. a tool trace on the surface<BR>b. a wave-like difference in the marginal form level of chamfer<BR>c. an obtuse angle and chipping in the marginal angled area<BR>d. scratches by the diamond particles of the tool<BR>C. Porcelain<BR>a. a tool trace on the surface<BR>b. a rough cutting surface<BR>c. an obtuse angle and chipping in the marginal angled area-clearer than that of the resin<BR>In conclusion, the results proved the efficiency working accuracy of CAD/CAM by probing the surface of three kinds of material cuts. As the detailed data of each candidate for analysis, it was obvious that the fabrication of titanium is superior to the others and that it will be a great reference for future studies and dental treatment.

Journal

  • Nihon Hotetsu Shika Gakkai Zasshi

    Nihon Hotetsu Shika Gakkai Zasshi 43(3), 614-625, 1999-06-10

    Japan Prosthodontic Society

References:  22

Cited by:  13

Codes

  • NII Article ID (NAID)
    10008173851
  • 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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