可摘局部义齿修复肯氏III类缺损的应力分析

目的:比较可摘局部义齿单侧、双侧设计修复肯氏III类缺损时,基牙及黏膜应力分布的差异。方法:建立5个牙列缺损及可摘局部义齿的有限元模型,并按单、双侧设计分为A、B2组。在ANSYS有限元软件下,进行有限元力学计算和分析。数据通过SAS6.2统计软件包的配对t检验进行统计学分析。结果:最大应力均出现在第一前磨牙及第二磨牙的近中颈部。A、B2组比较,P>0.05,基牙应力和黏膜应力均无显著性差异。结论:从基牙应力角度分析,可摘局部义齿修复肯氏III类缺损,单侧设计没有对基牙产生过大的负荷。

Stress analyses and comparison of the Kennedy III dentition defect restored with removable partial denture

PURPOSE: To investigate the stress distribution of the abutment and oral mucosa in Kennedy III, restored with removable partial dentures, either unilateral or bilateral designed. METHODS: Five FEA models were established for the partial edentulous and RPDs, which were divided into group A and group B.According to the denture design, bilateral(B) or unilateral(A) designed. The 3-D finite element analyses were proceeded and calculated with the help of the software ANSYS. Paired t test was used for statistical analysis using SAS 6.2 software package. RESULTS: The maximum stress appeared near the cervical mesial area of the first bicuspid and the second molar.There was no significant difference between the two groups in the stress distribution of the abutment and oral mucosa( P>0.05). CONCLUSION: In regard to the stress of the abutments, unilateral designs have no excess stress formed when RPD was used to restore Kennedy III dentition defect. Supported by Shanghai Leading Academic Discipline Project (Grant No.T0202).