Three-dimensional Finite Element Analysis Of Dental Implant With Design Of Platform Switching Technique Combined With Morse Taper Connection Under Loading

Purpose The purpose of this study is using the method of three-dimensional finite element analysis to determine the stress distribution in implant,abutment,cortical bone,cancellous bone,via changing the loading inclination angle that applied in dental implant with design of platform switching technology combined with Morse taper connection.And this is beneficial to optimize the implant-abutment connection structure design,provide theoretical research reference for the clinical use of implants and reducethe incidence of complications of implants,consequently improving the long-term success rate and clinical satisfaction of implant repair therapy.Methods A three-dimensional finite element model which is composed of implant,abutment and jaw bone block is established by modeling function of three-dimensional finite element analysis software ANSYS Mechanical14.5.Implant,abutment and jaw bone block are meshed seperately,then assembled them together.Loadings are then applied to the assembled model,loadings value are 150 N,and the loadings are simulated as 3 angled(deviating from the implant axis at 15°,30°,45°)loadings and 1 loading along the axis(ie 0°)of the implant.In addition to the different loading angles,the remaining experimental conditions are the same,the loading application mode is concentrated on the central position of the abutment.Results The stress distribution nephograms of implant,abutment,cortical bone and cancellous bone are obtained under loadings at different inclined angles.The finite element stress analysis results show that:comparing with the oblique loading condition,the Von Mises stress peak values of implant,abutment,cortical bone and cancellous bone are the lowest under vertical loading;the peak values of the implant,abutment,cortical bone and cancellous bone increase accordingly with the increase of the inclination angle of the loading;under the condition of the axial loading of the implant and the oblique loading in the axial direction of the implant,all the stress concentration areas of the implant and the abutment appear in the neck of implant-abutment junction;the peak values of Von Mises stress of the implant and abutment are the largest,regardless of the direction of the loading along the axis of the implant or deviating from the axis of the implant,which are much larger than that in the cortical bone and cancellous bone around the implant;the stress in the bone tissue around the implant is mainly distributed in the cortical bone.With the increase of theload inclination angle,the peak position of the Von Mises stress in the cancellous bone significantly shifts to the apical part of the implant.Conclusions For the implants with platform switching technique combined with Morse taper connection design:the lateral loading will increase the stress in the implant internal structure and in the peri-implant bone tissue;the implant and abutment are more susceptible to lateral loading than the bone tissue around the implant.There is a potential risk of deformation or fracture in the neck region of the implant and abutment junctions,which is a stress hazard.We should pay attention to strengthening the implant and abutment neck area strength,and try to avoid the emergence of lateral loading at the same time;this implant-abutment connection design limits stress to the internal structure of the implant,helping to reduce stress in bone tissue around the implant,reducing stress concentration in the cortical bone around the neck area of the implant,making the distribution of the stress distribution more uniform,so as to reduce the absorption of the cortical bone around the implant neck,which is beneficial to the preservation of the bone around the implant,and thus to the stability of the soft tissue around the implant.