歯科補綴物の自動研磨1.遠心バレル研磨装置の開発

[Automatic polishing of dental prostheses. 1. Development of a centrifugal barrel finishing apparatus].

抄録

ターンテーブル回転数可変（250～1,000rpm）の遠心バレル研磨装置を新たに開発し，アルミナ基材チップを用いてNi-Cr鋳造板（10×10×2mm）のバレル研磨を行った．鏡面を有する試料を用いた場合、回転数の上昇に伴い研磨量および表面粗さが増加し、表面光沢が低下した。粗研磨には高い回転速度が、精研磨には低い回転速度が有効であった。カーボランダムホイールで作製した試料を用いて、回転速度を変化させながら連続バレル研磨を試みた。この装置を用いて自動研磨から精密研磨まで行うことができた。

A centrifugal barrel finishing apparatus with a variable turn table rotational speed (250-1,000 rpm) was newly developed and barrel finishing of Ni-Cr casting plates (10 x 10 x 2 mm) was performed using alumina base chips. When using the sample with a mirror face the amount of polishing and the surface roughness increased and the surface gloss decreased with the increase in rotation speed. A high rotational speed was useful for coarse polishing and low rotational speed was useful for fine polishing. The continuous barrel polishing was trially performed using the sample prepared by the carborundum wheel under variable rotational speed. Automatic polishing to fine polishing could be done using this apparatus.