Naguib E, Khalaf M, Gad Allah A G
Operative Dentistry Department, Faculty of Oral and Dental Medicine, Cairo University.
Egypt Dent J. 1990 Apr;36(2):139-56.
Corrosion behaviour of dispersalloy amalgam and non-precious alloys in artificial saliva of different pH was studied using potential and capacitance measurements. In slightly acidic media, the amount of potential shift for all alloys studied is, small as compared to more acid media, pH = 1.85. On the other hand, in alkaline saliva, especially of higher pH, 12.01, the potential shift for dispersalloy amalgam, is higher than that of non-precious alloys. Further, Wiron S alloy showed the most resistive alloy in such media. The results of capacitance measurements are in general accord with those implied by the potential. The corrosion potential of the non-precious alloys-amalgam combinations reflect the activity of Wiron S-amalgam combination and inertness of the other combination. All amalgam samples exhibit a gradual loss of the surface luster with blackish discoloration and pitting after a long exposure period to the medium.
使用电位和电容测量方法研究了分散合金汞合金和非贵金属合金在不同pH值人工唾液中的腐蚀行为。在微酸性介质中，与酸性更强的介质（pH = 1.85）相比，所有研究合金的电位偏移量都较小。另一方面，在碱性唾液中，尤其是pH值较高（12.01）时，分散合金汞合金的电位偏移高于非贵金属合金。此外，Wiron S合金在这种介质中表现出最强的耐腐蚀性。电容测量结果总体上与电位测量结果一致。非贵金属合金 - 汞合金组合的腐蚀电位反映了Wiron S - 汞合金组合的活性以及其他组合的惰性。所有汞合金样品在长时间暴露于介质后，表面光泽逐渐丧失，出现黑色变色和点蚀。
