华西口腔医学杂志

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不同热处理对牙科银钯铸造合金显微硬度的影响

赵耀1  童徐1  刘嘉俊2  浩志超2  孟玉坤2   

  1. 1.口腔疾病与生物医学重庆市重点实验室,重庆医科大学附属口腔医院修复科,重庆 401147;2.口腔疾病研究国家重点实验室  华西口腔医院修复科(四川大学),成都 610041
  • 出版日期:2013-06-01 发布日期:2013-06-01
  • 通讯作者: 孟玉坤,Tel:028-85501441
  • 作者简介:赵耀(1983—),男,四川人,住院医师,硕士
  • 基金资助:

    四川省科技支撑计划基金资助项目(2010fz0086);深圳市科技计划基金资助项目(201003358)

Influence of cryogenic treatment and age-hardening heat treatment on the microhardness of palladium-silver dental alloys

Zhao Yao1, Tong Xu1, Liu Jiajun2, Hao Zhichao2, Meng Yukun2.   

  1. 1. Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, Dept. of Prosthodontics, The Affiliated Hospital of Stomatology, Chongqing Medical University, Chongqing 401147, China; 2. State Key Laboratory of Oral Diseases, Dept. of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
  • Online:2013-06-01 Published:2013-06-01

摘要:

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。

关键词: 牙科铸造合金, 时效硬化, 深冷处理, 显微硬度

Abstract:

Objective   The purpose of this study was to investigate the influence of cryogenic treatment and age-hardening 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.

Key words: dental casting alloy, age-hardening, cryogenic treatment, microhardness