口腔铸钛包埋料的研制  

Study and development of investment for dental titanium casting

作　　者：张娟[1] 张连云[2] 李长义[1] 史书俊[1] 韩素丽[1] 韩华[1] 

机构地区：[1]天津医科大学口腔医院,主治医师天津300070 [2]天津医科大学,主任医师教授天津300070

出　　处：《口腔颌面修复学杂志》2008年第3期213-216,共4页Chinese Journal of Prosthodontics

基　　金：天津市自然科学基金(项目编号:993607311)

摘　　要：目的:对自行研制的铸钛包埋料的性能、铸钛全冠精度及钛铸件反应层结构进行检测和分析。方法:对包埋料凝固膨胀、热膨胀和抗拉强度及铸钛全冠间隙值进行测量,并利用金相显微镜、扫描电镜观察钛铸件反应层结构,利用能谱分析仪检测包埋料中的元素在钛铸件表面的分布。结果:自行研制的铸钛包埋料凝固膨胀为0.19%,铸模温度200℃时热膨胀0.58%,抗拉强度为0.31MPa;其铸钛全冠颈缘间隙值颊舌向为0.040mm±0.002mm,近远中向为0.033mm±0.003mm;钛铸件反应层厚度为50μm,其结构由外向内分为5层:烧结层、α层、富硅层、针状结晶层、钛基体。结论:自行研制的铸钛包埋料各项性能优良,铸钛全冠精度达到ADA25-40μm的国际标准;磷酸盐包埋料中加入适当比例的ZrO2可降低钛铸件反应层厚度。Objective： To examine and analyse the properties of the self-made investment, the accuracy of titanium （Ti） full crowns and reaction layer structure of Ti castings. Methods： The setting and thermal expansion （SE and TE）, the tensile strength of the investment and the margin gap values of Ti crowns were measured. The structure of reaction layers and the distribution of elements on the surface of Ti castings were analysed by metallography, scanning electron microscope and energy dispersive spectroscopy respectively. Results： The SE of self-made investment was 0.19%, the TE was 0.58% at mold temperature 200℃, and the tensile strength was 0.31MPa; the margin gap values of Ti crowns were 0.040± 0.002mm on buccolingual section and 0.033± 0.003mm on mesiodistal section; the thickness of surface reaction layer of Ti castings was less than 50μm, and the structure of reaction layers was divided into 5 layers from the outer surface to the inner, including： sintering layer, α-case, Si-rich layer, acicular crystal structure and Ti-body. Conclusion： The self-made investment have good properties, and the accuracy of Ti full crowns attain the ADA international standard of 25-40μm; the thickness of the reaction layer on Ti castings surface is reduced with the ZrO2-modified phosphate-bonded investment.

关 键 词：口腔铸钛 包埋料 膨胀 精度 反应层 

分 类 号：R783[医药卫生—口腔医学]