Effect of Polishing Conditions on Surface Roughness of Denture Base Materials by Using the Centrifugal Shooting Type Polishing System "Grain-Slider NK".

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  • Ishikawa Kaori
    The Second Department of Prosthetic Dentistry, Osaka University Faculty of Dentistry
  • Nokubi Takashi
    The Second Department of Prosthetic Dentistry, Osaka University Faculty of Dentistry
  • Yasui Sakae
    The Second Department of Prosthetic Dentistry, Osaka University Faculty of Dentistry
  • Kita Seiichi
    The Second Department of Prosthetic Dentistry, Osaka University Faculty of Dentistry
  • Nagashima Tadashi
    The Second Department of Prosthetic Dentistry, Osaka University Faculty of Dentistry

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  • 遠心発射型研磨装置「Ｇｒａｉｎ－Ｓｌｉｄｅｒ　ＮＫ」における研磨条件が義歯床用材料の表面粗さに及ぼす影響

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Abstract

This study was conducted to improve the efficiency of the polishing procedure for various prosthetic appliances by using a newly-developed centrifugal shooting type polishing system.<BR>This apparatus has a specific structure for shooting the polishing particles using centrifugal force. The polishing particles consist of an elastic body as a core and layer of polishing material adhering to that core. The apparatus does not bounce off the polishing surface but slides along it.<BR>Two kinds of denture base materials (Co-Cr alloy and denture base resin) were investigated in this study. Polishing for each sample was performed at five different shooting angles of the polishing particles and in five different polishing times, respectively. The surface texture of these samples was investigated with a surface texture measuring apparatus. The results were as follows:<BR>1. Satisfactory surface roughness was obtained when the shooting angle was less than 45°.<BR>2. It took 3 to 10 minutes for Co-Cr samples and 1/2 to 3 minutes for resin samples to improve surface roughness.<BR>3. It was suggested that the surface of various dental materials could be polished using the same polishing particles by converting the shooting velocity of particles.

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