Takatsu T, Iwaku M, Fusayama T
J Dent Res. 1977 Jan;56(1):40-5. doi: 10.1177/00220345770560010801.
The metallurgical structure of a non-gamma-2 amalgam was investigated by using metallurgical microscopy, surface, point, and line analyses by an electron probe microanalyzer, and a microhardness test. Referring to these findings, their effects on clinical results were then discussed. Findings were as follows: The residual dispersant particle was less hard than the gamma 1 matrix, but the ring around it was much harder than the gamma 1 matrix or the residual gamma particle. The improved mechanical properties seem to be the result of the presence of this ring. The gamma 2 phase was absent in this amalgam. The absence of gamma 2 phase seems to improve chemical resistance, to prevent the deformation by mercuroscopic expansion of amalgam margins, and thus to decrease their fracture potential. The minute gamma 1 crystals found adjacent to the ring around the residual dispersant particle seem to indicate that they were late in crystallization, resulting in low early strength.
通过金相显微镜、电子探针微分析仪进行的表面、点和线分析以及显微硬度测试，对非γ-2汞合金的金相结构进行了研究。参照这些研究结果，随后讨论了它们对临床结果的影响。结果如下：残留分散剂颗粒比γ1基体软，但围绕它的环比γ1基体或残留γ颗粒硬得多。机械性能的改善似乎是由于这个环的存在。这种汞合金中不存在γ2相。γ2相的缺失似乎提高了耐化学性，防止汞合金边缘因汞齐膨胀而变形，从而降低其断裂可能性。在残留分散剂颗粒周围的环附近发现的微小γ1晶体似乎表明它们结晶较晚，导致早期强度较低。
