临床口腔医学杂志2012，Vol.28Issue(6)：333-336,4.DOI:10.3969/j.issn.1003-1634.2012.06.005
不同厚度饰瓷与基底瓷双层结构全瓷桥残余应力的有限元分析
The finite element analysis of the residual stress in the veneer and core porcelain with different thickness for the bilayered all-ceramic bridge
摘要
Abstract
Objective: To investigate the effect of different thicknesses of veneer and core porcelain on the residual stress distribution on the 3D finite element model of the bilayered all-ceramic bridge. Method: The 3D surface picture of the maxillary tooth and three unite fixed bridge were obtained through WIELAND ZENOTEC Scan.WIELAND ZENOTEC Cad, Geomagic,and CATIA were employed to transform the surface picture of the teeth,veneer and core of the bilayered all-ceramic bridage in different thickness into the 3D solid models, in order to build the 3D finite element model of three units fixed bridge. The residual stress of the models were analyzed when the temperature of the model was decreased from 575 ℃ to 25 ℃. Result: The residual stress of the all-ceramic bridage was distributed mainly on the interface between the core and veneer on the margin. The concentration of the residual stress was at the margins areas of the crown and the connector with thinner veneer porcelain, while it was uniform at the thicker veneer porcelain regions. The residual stress was increased with the decreasing of the temperature, and it was also increased gradually with the increasing of the difference of thermal expansion coefficient between core and veneer porcelain and veneer porcelain thickness. Conclusion: The residual stress analysis can be achieved through the analysis to the three-dimensional finite element model of the bilayrerd all-ceramic bridge established. The residual stress appears higher in the place where veneer porcelain is thinner and when the difference of thermal expansion coefficient is obvious. These results suggest that the compatibility of thermal expansion of core and veneer porcelain should be taken into account, and the thickness of veneer ceramic should also be considered in all -ceramic bridage design, suggesting.关键词
全瓷桥/氧化锆/有限元分析/残余应力Key words
All-ceramic bridge/ zirconia/Core/ Residual stress分类
医药卫生引用本文复制引用
丁洁,王伟峰,辛海涛,赵燕芳,欧阳炎..不同厚度饰瓷与基底瓷双层结构全瓷桥残余应力的有限元分析[J].临床口腔医学杂志,2012,28(6):333-336,4.基金项目
陕西省科技攻关项目资助(2008K01-42). （2008K01-42）
