桩冠修复后对根管壁应力分布影响的分析

目的:分析桩冠修复后对根管壁牙本质应力分布的影响。方法:选择一接近标准的上颌中切牙,运用三维有限元法构建前牙桩冠修复体模型,以及牙根及桩的仿真模型。并模拟不同牙合接触形式进行加载,对根管壁牙本质的应力分布情况进行数值分析。结果:无论是锥形桩还是平行桩,随着加载角度的增加和加载点向切端移动,牙根牙本质Von Mises和最大主应力峰值将增大。结论:从力学角度提示:桩冠修复时应尽量减小牙合力与牙体长轴的角度,在下颌做前伸运动时对颌牙应避免与修复体早接触。

The effect of the stress distribution of dentine under post crown prosthesis

Objective: To evaluate the effect of the stress distribution of dentine under post crown prosthesis.Methods: A maxillary central incisor that was close to criterion was selected to construct the three-dimensional finite element model on computer.The emulation models of root and post were also established.The dentin stress was analyzed by imitating various occlusion contact.Results: As the loading angular increased and the loading points moved to the incised margin,dentine Von Mises and main stress peak amplitude would be accreted both in cone post and in parallel post.Conclusion: Such mechanical analysis results suggest that the angle of the occlusal force and long axis of body should be diminished to the limit,the prosthesis should be avoided from the contact with teeth under the protrusive movement.