수종 치과용 석고의 마모저항도 및 표면조도에 관한 비교 연구

Abstract

The purpose of this study was to investigate the abrasion resistance and surface roughness of conventional dental stones and improved dental stones and newly developed dental stones. Materials included in this study were several dental stones and newly developed dental stone; 2 type III, 6 type IV(including newly developed dental stone),1 type V Ten specimens for each material,total ninety specimens were made. Each specimen was subjected to 50 complete cycle abrasion under constant load 0.42N at speed of 6mm per sec.The depth after abrasion test was measured for each specimen. Surface roughness before and after abrasion test was compared.The results were as follows ;1.The resin containing die materials such as Tuff Rock and Resin Rock had superior abrasion resistance.2.Type IV,V Surface roughnessdental stone exhibited greater abrasion resistance than Type IIIdental stone.3.The results of the surface roughness showed similar pattern with the abrasion resistance.