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치과도재용 비귀금속 Ni-Cr 합금의 열처리가 산화피막에 미치는 영향
곽동주,장기환,주경삼 한국위생과학회 1997 한국위생과학회지 Vol.3 No.1
Although the standard quantity of generated oxide could not be known, it was possible not only to find out occurrence of darker color an the surface of alloy but also to identify reductin of its brightness when degassing in air with naked eye. This study was carried out by observing conditions of an oxide an the surface of alloy according to the conditions of its heat treatment and by analysing the change in composition an its surface. The result of this study is summarized as follows. It was shown that the higher the more the generated metal oxide while the higher heat treatment, the less the Ni composition in vacuum condition but the more the composition in air. It was shown, an the other hand, that the higher the temperature in vacuum condition in case of Duraboud, the more the Cr composition. However, the Cr composition indicated more reduction in air than that in vacuum condition. In addition, it was shown that the higher the temperature both in air and vacuum condition, the less the Ceredium-V composition. When comparing the results after carrying out the heat treament at the same temperature, it was indicated that the Mo composition was higher in both metals in vacuum condition. The metal oxide was mainly composed of Ni and Cr oxides. These were much distributed on an oxide consisting of larger Mo particles.
Collarless 도재전장주조관의 제작 방법에 따른 치경부 변연적합도에 관한 연구
조수열,장기환,임시덕,주경삼 한국위생과학회 1997 한국위생과학회지 Vol.3 No.1
The purpose of this study was to evaluate the marginal gap in the collarless ceramo-metal restoration by the different techniques and materials. Three ceramic materials were used : 1) Vita porcelain 2) Ceramco porcelain 3) Vita porcelain and margin porcelain technique, wax technique, and LCS technique. The results were as follows : At point A, the marginal adaptation in case of Vita porcelain by LCS technique was best ㎛ and its marginal gap was 59.9 ㎛ At point B, the marginal adaptation was best in case of Vintage porcelain by margin porcelain technique and its marginal gap was 60.0 ㎛ at point B. At point C, the marginal adaptation was best in case of Vita porcelain by wax technique and its marginal gap was 60.1 ㎛.