临床常用的牙修复合金如汞合金、金合金、银合金、铜合金、镍铬合金等在口腔内一定时期后,会有不同程度的变色或腐蚀,不仅影响修复体的美观,严重时会降低金属和机械强度,甚至造成修复体损坏。高开金合金虽具有较好的抗变色和抗腐蚀性,但黄金价昂,难于普及。近年来,对贱金属合金的研究和应用日渐增多。这类合金除要求具有良好的物理机械性能和生物适合性外,如何提高化学稳定性,增强抗变色和抗腐蚀能力亦很重要。本文仅对牙修复合金的变色和腐蚀的概念,腐蚀机理,合金在口腔内的腐蚀 Clinical commonly used dental restoration alloys such as amalgam, gold alloy, silver alloy, copper alloy, nickel-chromium alloy and so on in the oral cavity after a certain period of time, there will be varying degrees of discoloration or corrosion, not only affects the aesthetic appearance of prosthesis, serious will reduce Metal and mechanical strength, and even cause damage to the prosthesis. High open gold alloy has better anti-discoloration and corrosion resistance, but expensive gold is difficult to universal. In recent years, research and application of base metal alloys have been increasing. In addition to requiring good physical-mechanical properties and biocompatibility, it is also important that such alloys improve chemical stability, enhance resistance to discoloration and corrosion. This article only on the concept of tooth repair alloy discoloration and corrosion, corrosion mechanism, alloy corrosion in the mouth