Objective The purpose of this study was to investigate the influence of cryogenic treatment and agehardening heat treatment on the micro-Vicker's hardness of palladium-silver dental alloys.Methods A low-gold content dental casting alloy composed of Ag-Pd-Cu-Au was prepared for this study.Experimental specimens according to standard requirements were prepared following a standard dental laboratory casting procedure,cast specimens were heated to 900 ℃ and quenched in ice water.The specimens were then divided into 4 groups.They were subsequently subjected to different treatments,including age-hardening heat treatment,cryogenic treatment,heat treatment combined with cryogenic treatment.The non-treated group was used as control.The micro-Vicker's hardness value was examined.The significance of correlation was analyzed.Results The micro-Vicker's hardness of specimens after age-hardening heat treatment,cryogenic treatment,heat treatment combined with cryogenic treatment increased by 129％,13％ and 141％,respectively,compared with that of the non-treated control group.Conclusion Age-hardening heat treatment and cryogenic treatment were effective in elevating the hardness of Ag-Pd-Cu-Au alloy.%目的 探讨不同热处理对牙科银钯铸造合金显微硬度的影响.方法 自制牙科银钯铸造合金,用牙科标准铸造程序制作合金试件.试件加热到900℃后冰水中淬火作软化热处理,然后分组分别进行硬化热处理、深冷处理、硬化热处理并深冷处理,以软化热处理组作为对照组.测试经不同热处理后合金的显微硬度,进行统计学分析.结果 与对照组相比,硬化热处理、深冷处理、硬化热处理并深冷处理均提高了合金的显微硬度,硬化热处理组提高了129％,深冷处理组提高了13％,硬化热处理并深冷处理组提高了141％.结论 硬化热处理和深冷处理均可以提高合金的显微硬度,而硬化热处理的提高更为明显；当硬化热处理和深冷处理联合应用时,二者对合金硬度的提高可产生累加效应.
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