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수은함량과 응축압이 치과용 아말감의 표면조도에 미치는 영향
홍운표,김철위 대한치과기재학회 1984 대한치과재료학회지 Vol.11 No.1
A comparative investigation on surface roughness of four kinds of dental amalgam, three of those were manufactured in Korea, has been done for variations in mercury content and condensation pressure. Three different mercury content-the normal, recommanded level and 5% more and less than this and two condensation pressure-10MPa and 14MPa were selected. And surface roughness of amalgams in three conditions-(1) unpolished, (2)metallurgically polished, and (3) polished with pumice and zinc oxide paste, was measured with a Surface Profile Recorder. From the experiments, the following results were obtained; 1. In every case, no statistical differences were found in surface roughness for the variation of condensation pressure. 2. Atomized high copper amalgam showed the highest surface roughness for the level of 5% mercury less than recommanded, but conventional lathe cut and admixed amalgams didn't show much difference in surface roughness for the variation of mercury content. 3. When metallugically polished, each amalgam showed the highest surface roughness for the level of 5% mercury less than recommanded. 4. In all of the cases, there wasn't much difference between surface roughness for the recommanded mercury level and that for the level of 5% mercury more. 5. In case of the recommanded mercury content, there wasn't much difference in surface roughness for the types of amalgam alloys.