金瓷界面力学特性的数值分析

建立不同金属厚度的金瓷试件梁有限元力学模型,分析界面处应力分布,利用真实口腔修复体的金属和瓷的力学参数,分别对常用的三种不同厚度为基底的金属梁试件进行了瓷层以0.2mm为梯度进行加厚,计算各梁的界面应力和位移,同时也对力学性能较好的金属层和瓷层一组进行了全瓷梁应力、位移计算分析.为了更加真实的反映计算结果,部分试件的数值分析与实验进行了比较.通过分析比较,结果显示金瓷界面处应力较大,是脱剥瓷常发生部位;金属层较薄的烤瓷体有更高的韧性,力学性能较金属基底厚的有更强的抗脱瓷能力;金属作为基底大大提高了试件的抗弯曲能力,比全瓷梁更增强了试件破坏能力.

Numerical Analysis of Mechanics Behaviors of Metal-porcelain Interfacial

Model of different thickness ratio of metal-porcelain specimens is constructed by finite element method(FEM).In order to analyze interfacial stress and displacement,true constant of oral porcelain-fused-to-metal(PFM) is accepted.In this paper,PFM of three different thickness are studied.In the process of study,metal thickness is fixed,but porcelain thickness is increasing by 0.2mm gradient.Through calculating by FEM,interfacial stress and displacement of all specimens are obtained.Analysis results of several specimens are compared with experimental results for reflecting validity of numerical analysis.It can be concluded from results of the numerical analysis that stress of metal-porcelain interfacial is higher than that of other parts,so spall of metal and porcelain is often happened in the interfacial.Ductility of PFM with thin metal thickness is superior to that of thick one.Therefore,intensity of specimens with metal as base is more strength than that of all porcelain..