Xu H H, Giuseppetti A A, Eichmiller F C, Ives L K
Paffenbarger Research Center, American Dental Association Health Foundation, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
Quintessence Int. 1999 Mar;30(3):199-208.
This study investigated the wear resistance of a mercury-free silver direct-filling material and a dental amalgam.
A precipitated silver powder was rinsed with dilute fluoboric acid and consolidated into a cohesive solid. For tooth cavity restoration and flexural testing, the silver was consolidated with a dental amalgam plugger at a load of 15 N. For wear testing, because of the relatively large specimen size, the silver was pressed at a pressure of 150 MPa, yielding a density similar to that obtained by hand consolidation.
The silver had a flexural strength twice that of amalgam. Pin-on-disk wear resulted in a smooth surface and hardening in silver, as measured by indentation inside the wear tracks, in contrast to the damage that was found in amalgam. The wear track cross-sectional area (n = 12) at 10(6) revolutions was not statistically significantly different among amalgam, polished silver, and burnished silver.
The consolidated silver exhibited work hardening and surface densification during wear and, as a result, was more resistant to wear-induced damage than amalgam.
本研究调查了一种无汞银直接充填材料和一种牙科汞合金的耐磨性。
用稀氟硼酸冲洗沉淀银粉并固结为粘性固体。对于牙洞修复和弯曲测试，在15 N的载荷下用牙科汞合金充填器将银固结。对于磨损测试，由于试样尺寸相对较大，以150 MPa的压力压制银，得到的密度与手工固结获得的密度相似。
银的弯曲强度是汞合金的两倍。销盘磨损导致银表面光滑且出现硬化，通过磨损轨迹内的压痕测量，这与汞合金中发现的损伤形成对比。在10⁶转时，汞合金、抛光银和打磨银的磨损轨迹横截面积（n = 12）在统计学上无显著差异。
固结银在磨损过程中表现出加工硬化和表面致密化，因此比汞合金更耐磨损损伤。
