Three-Dimensional Finite Element Analysis Of Implant System With Tapered Interference Fits

In the past half century,with the development of oral implant technology,more and more implant systems are used in oral repair.Most implants are bolted,which can lead to plant failure due to loose screws or broken connections,and Bicon implant connected by Morse taper self-locking is more stable and reliable than bolted connections.Through finite element analysis,the binding pressure,dislocation force and torque generated by self-locking in the Bicon implant connection system is studied,and the effects of angle base station and load direction on the stress and bone tissue of various components are studied.The main conclusions were drawn as follows:(1)When the implant taper is 1.5°,the maximum subsidence of the base station of the 4.5 mm implant system is 0.4 mm,and the maximum subsidence displacement of the base station of the 4.0 mm system is 0.5 mm when the taper is 1°.The best fixed range of the base station obtained by the analysis is 0.1 to 0.4 mm,the dislocation force and torque of the simulation and theoretical derivation are very large,the error is within 6%and 9%,respectively,confirming that the connection system has good stability and reliability,not easy to fall off.(2)Under the vertical load,with the increase of the angle of the base station,the stress and main strain of each part in the model are increased,of which the base station angle is the maximum stress of each part in the model of 25°.The maximum equivalent stress of the base in the 3.5 mm and 3.0 mm models have exceeded the yield strength of the given material,and the main strain of the pine bone in the 3.0 mm model is close to the bone threshold theory given,with a risk of lesions.(3)Under the influence of different direction loads,the vertical-directional load has the least impact on the whole system,the load in the oblique and horizontal direction has the greatest impact on the system.The smaller the implanted outer diameter,the greater the stress and bone tissue deformation on each part.The above conclusions can provide some suggestions and theoretical references for the selection of implants in clinical oral implants,the choice of angle base in clinical oral implanted and the direction of the patient's bite force.It is hoped that this can promote the development and perfection of the cone-shaped over-profit with the connected implant system.