三维有限元法分析修复体应力变化的应用及前景  

Three-dimensional finite element analysis of prosthesis stress variation

作　　者：占柳[1] 谢淑娟[1] 潘卫红[2] 

机构地区：[1]华中科技大学医院,湖北省武汉市430074 [2]华中科技大学同济医学院附属协和医院,湖北省武汉市430022

出　　处：《中国组织工程研究》2013年第29期5403-5408,共6页Chinese Journal of Tissue Engineering Research

基　　金：中央高校基本科研业务费专项资金资助项目(2010JC030)~~

摘　　要：背景:利用三维有限元法的变分原理和加权技术,可将具有复杂形态结构的人类牙齿模型化,有利于了解动态过程中牙体硬组织和修复体的应力分布。目的:综合分析近年来口腔领域的国内外学者对修复体生物力学的三维有限元研究状况,特别是金属基底冠、瓷层厚度、根管预备及充填对牙体应力变化的影响。方法:由第一作者应用计算机检索1993年4月至2012年9月PubMed数据库及2001至2008年中文期刊全文数据库、维普数据库有关三维有限元法分析金属基底冠、瓷层厚度、根管预备及充填方式对牙体应力变化影响的文章,英文检索词为"porcelain-fused-to-metal,finite element method,stress analysis,root canal",中文检索词为"烤瓷熔附金属全冠,三维有限元法,应力分析,根管"。排除重复性研究及Meta分析,共保留40篇文献进行综合分析。结果与结论:三维有限元法在口腔医学中对建立高真实度和精确度的模型有着重要的意义,因此对牙体的根管治疗和治疗后修复提供了有效的生物力学信息。有关牙体与修复体在应对咀嚼作用时的应力分布在不断地探索与研究。文章总结了口腔领域国内外学者利用有限元法分析桩核冠修复体的应力变化,为将来进一步的研究提供了参考和借鉴。结果显示,三维有限元法能够建立具有非线性,各向异性等生物力学特征的三维有限元模型,能够逐渐完善其从静态分析到动态分析的转变,以真正达到精确模拟口腔生物学形态及牙齿咀嚼功能的目的。BACKGROUND：Based on variational principle and weighting technology of three-dimensional finite element method, human teeth with a complex morphology can be modeled, which helps to understand the stress distribution of dental hard tissue and prosthesis during the dynamic repair process. OBJECTIVE：To comprehensively analyze the three-dimensional finite element studies concerning biomechanics of dental prostheses, focusing on the effects of metal crown, porcelain thickness, root canal preparation and fil ing on the tooth stress. METHODS：A computer-based search of PubMed （1993-04/2012-09）, China Academic Journal Network Publishing Database （2001-2008）, and VIP （2001-2008） was performed by the first author to retrieve articles concerning the effects of metal crown, porcelain thickness, root canal preparation and fil ing on the tooth stress. The keywords were“porcelain-fused-to-metal, finite element method, stress analysis, root canal”in English and Chinese. Articles with repetitive contents or meta-analysis were ruled out. Then 40 articles were suitable for further analysis.RESULTS AND CONCLUSION：Finite element method has important significance to establish high-fidelity and high-accuracy models in oral medicine, thereby providing effective biomechanical information for the root canal treatment and post-treatment repair. Scholars continue to explore the stress distribution of dental prostheses during chewing. This review summarizes the stress changes of post and core crowns, supporting reference for further research. Three-dimensional finite element method can be used to build nonlinear three-dimensional finite element models with anisotropic biomechanical characteristics, and can gradual yimprove the transition from static analysis to a dynamic analysis, truly achieving accurate simulation of oral biology and dental morphology as wel as chewing function of the teeth.

关 键 词：生物材料 生物材料综述 烤瓷熔附金属全冠 修复体 瓷层厚度 根管预备 充填 三维有限元法 应力分析 根管 其他基金 

分 类 号：R318[医药卫生—生物医学工程]