Three-dimensional Finite Element Analysis Of Dental Implants With Different Bone Defects

objective:To analyze the effect of different bone defect types on stress distributions of the implant- bone interface under dynamic loads by finite element method. Providing mechanical basis for clinical bone augmentation surgery on implant-bone interface binding force,the mechanical stability and long-term effect,choose a different fixation methods for different types of bone defects.Methods:Modeling finite element models of four types of bone defects (fenestrative bone defect, dehiscent bone defect, circular bone defect, vertical bone defect) without the first molars, then the models of grafting bone and implants corresponding to each model were established.100N vertical load and 200N oblique load was used to simulate dynamic chewing process of 5 stages in a masticatory cycle and the maximum Von Mises stresses,the amount of displacementat and shear forcethe implant-bone interface was analyzed.Results:1. Modeling finite element models of four types of bone defects,grid cell are shape rules and reasonable division of the model.2.Stress is mainly concentrated on the neck of the implant. the stress and the stress wave of implant-bone interface in model 4was the largest. the stress and the stress wave of implant-bone interface in model 3 was the minimum. the stress of implant-bone interface in model 3&4 were similar.3 the displacement of the implant in model 3 was small and the displacement of the implant in model 4 was relatively large.4 the shear stress of implant-bone interface in model 4 was the largest, the shear stress of implant-bone interface in model 3 was the least.