고무인상재의 표면처리가 추경석고의 표면물성에 미치는 효과

Abstract

The contract angle of water to elastomer is so great that it exhibits significant possibility of intruding pores while taking impression or pouring stone. The purpose of this study was to investigate the effect of appling surface treatment agent(Spannex Ⅱ, Dreve-dentamid, Unna, Germany) on elastomeric impression materials. For this study, three kinds of elastomeric impression materials (Omniflex, U.S.A.; Advanced, U.S.A.; Impregum F, Germany) and an improved stone(MG Crystal Rock, Japan) were sued. And then the effect with or without appling surface treatment agent on elastomeric impressions were removed after 1 hour. Reproducibility of the details, hardness and surface roughness of the stone surface were measured after 24 hours. The non-parametric data was analyzed with a two-way ANOVA test. For the reproducibility in detail on the improved stone, no differences were founded in all tested elastomers of 75㎛ line. Advanced and Impregum F, however had good reproducibility on with treatment than without treatment in 50 ㎛ line and treated group among them showed good reproducibility than without treatment in 25㎛ line. As the microhardness of Omniflex was significantly increased by with surface treatment(p<0.05) but there were no differences in Advanced and Impregum F(p>0.05). Ra values of surface roughness for all tested elastomers with surface treatment were significantly increased(p<0.05). It was concluded that the surface treatment agent could be used by considering the compatibility of the impression material and the stone.