摘要
目的:通过三维有限元分析的方法模拟牙体组织的力学组成,分析不同形态的氧化锆陶瓷桩修复上颌中切牙后对周围剩余牙本质的应力分布规律。方法:根据成年男性上颌中切牙的标准数据,通过ANSYS 12.0软件直接建立平行桩、锥形桩、末端锥形桩3种不同形态的氧化锆陶瓷桩修复上颌中切牙的三维有限元模型;对建立的模型进行网格划分;通过加载边界条件,设定模型主参数以及加载静态载荷;分析牙本质内的Von Mises应力的分布规律,观察不同形态的桩核对其周围剩余牙本质的影响。结果:成功建立了不同形态的氧化锆陶瓷桩核和牙根的三维有限元模型;柱形桩和锥形桩的牙本质应力分布沿牙本质界面向牙颈部逐渐增大达高峰,末端锥形桩应力最高峰在根末1/3;锥形桩所受的牙本质应力大于柱形桩,且锥度越大,受到的应力也相应越大。结论:柱形桩组所受应力值均小于锥形桩组,末端锥形桩组在牙根部应力值最大;选择氧化锆材料时,柱形桩为最佳设计。
Objective：To analyze the stress distribution of remaining dentin after restored maxillary middle incisor with different forms of zirconia posts by simulating the mechanics of body tissue with three dimensional finite element analysis.Methods：According to the standard data of adult male maxillary incisor,three-dimensional finite element models of zirconia post-and-core with parallel post,tapered post or post tapered at one end repairing for maxillary middle incisor were established and meshed using the ANSYS 11.0software.By loading boundary conditions,the main parameters of the models were set and the static load was applied.The distribution laws of Von Mises stress in dentine were analyzed.The effect of the posts with different forms on residual dentine was evaluated.Results：The models were successfully established.The dentin stress of cylindrical post and tapered post gradually increased to the peak along the dentin boundary to the tooth neck,and the maximum dentine stress of post tapered at one end was in the apical third.The dentin stress of taper post was greater than that of cylinder post,which increased with increasing taper degree.Conclusion：The stress value of cylindrical post was lower than that of taper post.The stress value of post tapered at one end was concentrated in the apical third.Cylindrical post was the best design when choosing zirconia materials.
出处
《口腔医学研究》
CAS
CSCD
北大核心
2015年第11期1104-1107,共4页
Journal of Oral Science Research
基金
黑龙江省科技攻关项目(编号:GC12C305-3)
关键词
桩核
氧化锆
应力
三维有限元分析
Post-and-core Zirconia Stress Three-dimensional finite element analysis
