Johansson B I, Mjör I A
Scandinavian Institute of Dental Materials, Oslo, Norway.
Scand J Dent Res. 1988 Feb;96(1):75-82. doi: 10.1111/j.1600-0722.1988.tb01411.x.
The marginal degradation and corrosion of restorations made of a high copper dispersed amalgam were studied as a function of time for up to 5-yr observation periods. The effect of minor defects present after finishing the restorations was included in the assessment of the initial marginal degradation. A slow progressive marginal degradation was noted and it was enhanced by initial defects. Subsurface corrosion including attacks of the phase and grain boundaries, corrosion within the bulk, and layers of corrosion products along the tooth/restoration interfaces were observed in restorations after some years in clinical service. The subsurface corrosion is considered to weaken the amalgam and it might enhance the marginal degradation, i.e. a stress corrosion type of degradation.
对高铜分散型汞合金修复体的边缘降解和腐蚀进行了研究，观察期长达5年，研究其随时间的变化情况。修复体完成后存在的微小缺陷的影响被纳入初始边缘降解的评估中。观察到边缘有缓慢的渐进性降解，初始缺陷会加剧这种降解。在临床使用几年后的修复体中，观察到了包括相界和晶界侵蚀、整体内部腐蚀以及沿牙齿/修复体界面的腐蚀产物层在内的亚表面腐蚀。亚表面腐蚀被认为会削弱汞合金，并且可能会加剧边缘降解，即一种应力腐蚀类型的降解。
