种植体钛基台和全瓷冠间粘接界面的三维有限元应力分析

目的：观察钛基台支持时四种粘接剂和3种全瓷冠间不同粘接界面的应力分布情况。方法：建立下颌第一磨牙种植体局部结构的三维有限元模型,模拟最大咬力在冠咬面加载水平和垂直力。结果：磷酸锌粘接界面的应力最大;铸瓷冠可以降低粘接界面的应力大小;粘接界面的应力受粘接剂的影响最大;水平加载最大应力远大于垂直加载;弹性应变主要集中在基台与种植体和冠颈部连接处。结论：粘接界面应力过大应首先考虑更换粘接剂,其次考虑面侧向力过大或不平衡,最后考虑修复冠材料。基台与种植体和冠颈部连接处最可能发生折断。三维有限元法应力分析可以为种植修复提供较准确的理论依据,对临床工作准备和预期都具有重要的指导意义。

Titanium implant abutment and the all-ceramic crowns bonding interface between the three-dimensional finite element stress analysis

Objective： Observation of titanium abutment,four binders and three kinds of all-ceramic crowns of the different bonding interface stress distribution.Method： Mandibular first molar implants local structure of three-dimensional finite element model to simulate the maximum bite force at the crown teeth occlusal surface horizontal and vertical force loading.Result：The maximum stress of zinc phosphate bonding interface;cast porcelain crown can reduce the size of bonding interface stress;bonding adhesive interface stress by the greatest impact;level of the maximum load is much larger than the vertical load force;elastic strain concentrated in the base station and the implant and crown-neck junction.Conclusion： Excessive stress on bonding interface should first consider replacing the binder,followed by the lateral force occlusal considered too large or unbalanced,and finally to consider repairing the crown material.Abutment and implant and crown neck junction most likely break.Finite element method can provide a more accurate implant theoretical basis of clinical preparation and is expected to have important guiding significance.