云纹干涉法对不同层厚比的口腔金瓷修复体界面力学特性的研究  

The Research to Interface Mechanical Characteristic of Oral Metal-Porcelain Restoration of Different Thickness Ratios by Moiré Interferometry

作　　者：米红林[1] 方如华[1] 张修银[2] 

机构地区：[1]同济大学固体力学教育部重点实验室,上海200092 [2]上海第二医科大学附属第九人民医院,上海200011

出　　处：《医用生物力学》2004年第3期136-141,共6页Journal of Medical Biomechanics

基　　金：国家自然科学基金 ( 3 9870 777);高等学校博士点专项基金 ( 19990 2 4712 )资助

摘　　要：目的　金瓷修复体 (PFM)兼具金属强度及陶瓷美观的优点 ,在口腔医学上得到了广泛的应用 ,但临床上仍常发生脱瓷并且又多发生在界面处 ,针对这种情况 ,通过研究不同层厚比的金瓷修复体试件梁的界面强度 ,以分析其破坏机理 ,为加工工艺提供参考。方法　采用云纹干涉法对界面开有贯穿裂纹和未开裂纹试件进行了四点弯曲实验研究 ,并与有限元计算结果进行了比较。结果　得到裂纹尖端及界面处的位移场、应力场 ,计算了界面断裂强度及应力等参量 ,并给出了试件制备、实验方法。结论　由于金瓷层厚比的不同导致金瓷横截面中性层位置发生改变 ,得出金瓷层厚比对金瓷修复体界面强度有很大影响。Objective Porcelain-fused-to-metal (PFM) is widely used in oral clinic because of its intensity of metal and finery of porcelain. However porcelain often flakes off in the interface of metal and porcelain. To investigate this problem,the interfacial intensity of different thickness ratios is studied for analyzing the failure mechanism. Methods Moiré interferometry was applied in experimental study of four-point bending specimens with interfacial crack and no interfacial crack and results of experiment are compared with that of finite element analysis. Results Displacement field and stress field of crack tip are obtained. Simultaneously,fracture density and stress parameter of interface are also calculated. Besides,specimen fabrication process and experimental method are also introduced. Conclusion Because of mid-layer place of metal-porcelain cross section moved along with layer ratio,so it can be concluded that thickness ratio has great influence for fracture intensity.

关 键 词：金瓷修复体 层厚比 云纹干涉法 有限元 

分 类 号：R783.3[医药卫生—口腔医学]