Pedigoni M de L, Centola A L, Froner I C, Turbino M L, Ribeiro S A
Faculdade de Odontologia de Ribeirão Preto, Universidade de São Paulo.
Braz Dent J. 1991;2(1):51-7.
Dental cavities were prepared and restored with amalgam, using three different silver alloys. The surface of the restorations was finished 24 hours after condensation, with a rotatory instrument using a low- or high-speed handpiece. The specimens were then submitted to metallographic polishing and one of the margins of the amalgam restoration were then submitted to Vickers' micro-hardness test. Another micro-hardness test was accomplished 168 hours after condensation and the two sets of micro-hardness values were compared. No significant statistical differences were detected between the micro-hardness values obtained with low or high speed in the polishing technique.
制备牙洞并用汞合金修复，使用三种不同的银合金。在汞合金凝结24小时后，用旋转器械配合低速或高速手机对修复体表面进行修整。然后对样本进行金相抛光，并对汞合金修复体的其中一个边缘进行维氏显微硬度测试。在凝结168小时后进行另一项显微硬度测试，并比较两组显微硬度值。在抛光技术中，低速和高速获得的显微硬度值之间未检测到显著的统计学差异。
