衔铁与不同金属铸接前后金相结构的比较  

A comparison between the cast-bonded keeper with different dental alloys in the metallographic structure

作　　者：郑元俐[1] 魏斌[1] 姚寒曦[1] 

机构地区：[1]上海交通大学医学院附属第九人民医院.口腔医学院口腔修复科,上海200011

出　　处：《上海口腔医学》2006年第4期416-418,共3页Shanghai Journal of Stomatology

基　　金：上海市重点(特色)学科建设项目(T0202)

摘　　要：目的:用铸接法制作磁性覆盖义齿根面结构,分别采用不同合金进行常规铸造,观察不同合金铸造温度对衔铁金属显微结构的影响。方法:分别采用金合金、镍铬合金、纯钛与Magdisc500成品衔铁包埋铸造、抛光、平整、清洁并制作金相试件。用金相显微镜对铸接前后的衔铁进行金相分析,以成品衔铁作为对照。结果:与铸造前相比,金合金组衔铁晶粒无明显变化。镍铬合金组、纯钛组衔铁晶粒变大、变粗,纯钛组更为粗大。结论:用不同合金铸接衔铁,会对衔铁的金相产生影响;合金铸造温度越高,晶粒越粗大。金合金组影响最小。PURPOSE： The aim of this study is to investigate the changes of the metallographic structure of the castbonded keeper when cast in varied temperatures. METHODS： Three groups were included in this study： the gold alloy group, the Ni-Cr alloy group and Ti group, with the Magdisc 500 keeper as the control group. Each sample that contained a Magdisc 500 keeper was fabricated with the cast-bonded technique. Then, the samples were fabricated into a metallographic sample by polishing, smoothing and cleaning. Each sample was observed under metallographic microscope. RESULTS： There were no significant changes in the crystal size between the keeper in the gold alloy group and that in the control group. In both of the Ni-Cr alloy group and Ti group, the crystal of the keeper became larger, and this was more evident in the latter group. CONCLUSION： The keeper varied in the metallographic structure if cast-bonded with gold alloy, Ni-Cr alloy or Ti metal. The higher the casting temperature, the larger the crystal of the keeper. The results suggest that the change in the gold group is less than that in the Ni-Cr alloy group and Ti metal group. Supported by Shanghai Leading Academic Discipline Project （Grant No.T0202）.

关 键 词：铸接式衔铁 牙科合金 金相 

分 类 号：R783.1[医药卫生—口腔医学]