Three-dimensional Finite Element Stress Analysis Of Platform Switching Implant With Various Diameter Abutment

Purpose Study the stress distribution of abutment,implant and alveolar bone at different angles and diameters by changing the diameter of abutment with three-dimensional finite element method to make suggestion for improving the design of implant-abutment connection structure and choosing the clinical use of implant.These are made to improve the clinical success rate of implant prostheses.Methods With the help of three-dimensional finite element software ANSYS,to establish the digital model of abutment,implant and alveolar bone.Then appropriate physical parameters are given to the model,and the assembly of the finite element model is completed after meshing the model.Given the boundary constraints of the model,a uniform load of 150 N is applied to the model,which is divided into three groups: A,B and C.Group A axial load is divided into 11 group according to the diameter of the base,group B 30 degree oblique load is also divided into 11 groups according to the diameter of the base,group C has the same diameter and is divided into 7 groups according to the angle of the load.The other experimental conditions are the same,and all loads are applied uniformly on the central surface of the base.Results A total of 27 groups of different finite element models were established,and the von mised distribution nephograms of implant,abutment and alveolar bone under different experimental conditions were obtained.The results of finite element stress analysis show that the axial load itself is an ideal load mode,and its stress can be more uniformly dispersed in the whole implant repair system.Increasing the diameter of the abutment can reduce the stress concentration at the neck of the abutment to a certain extent.The maximum stress of cortical bone and cancellous bone increased slightly under 30 degree oblique loading,but it was still far lower than the maximum stress of implant abutment.With the increase of load angle deviation from the axial direction,the stress around the abutment implant rises sharply,approaching the yield strength of the material.Conclusion The stress of the platform-switched implant can be better dispersed at the interface between the implant and the abutment under the axial load,and there is no obvious stress concentration.Stress concentration is easy to occur at the joint of implant and abutment under oblique loading.By increasing the diameter of abutment,the contact area between abutment and implant can be increased effectively,the stress distribution is more uniform,the maximum stress value of neck can be reduced,and the risk of fracture of abutment neck can be reduced.Therefore,it is of positive significance to increase the diameter of abutment to prevent abutment fracture.