Finite Element Analysis And Fatigue Experimental Study On Composite Base Implants

The dental implant consists of an implant and an artificial dental crowns,and the implant consists of a retainer and an abutment.The retainer is deeply embedded in the jaw bone and is combined with the bone tissue to play a role as the tooth root;an artificial dental crown is embedded in the top of the abutment,and the area of the binding between the retainer and the bone is an important indicator of the biomechanical stability of the implant.In actual implant surgery,when the jaw plate of the patient is relatively thin or the distance between the mandibular canal to the alveolar crest is relatively short,it is often necessary to incline the retainer to ensure that the retainer and the bone are combined in a sufficient area,while tilting the implant is to ensure the uprightness of the crown has an angle adjustment function;in addition,in the half and the overall planting,two or more implants are required to be used together,so the parallelism between the implants must be ensured.This requires the implants to have flexible angle adjustment functions.Composite base implants have solved the problem of adjusting the angle and height during the dental planting process.However,whether the complexity of its structure will cause changes in its biomechanical stability is still an unresolved issue.The theoretical analysis and experimental research on the biomechanical stability of composite base implants are of great significance.The main research contents of this paper are as follows:1.Establishment of three-dimensional solid model of implant and mandible.According to the structural features of implants and jaw bones,based on some technical parameters of two-stage implants and composite abutment implants,SolidWorks was used to establish three-dimensional solid model of two-stage implants and composite base implants with different angles;using CBCT,the image was combined with the inverse modeling software Mimics to create a three-dimensional solid model of mandible(dental dentition)with a high degree of geometric similarity,and the model was optimized by using Geomagic software.Finally,by combining the simulated implant and the jaw bone,an assembly model of the implant and jaw is established,providing the model basis for the finite element analysis.2.Finite element analysis based on composite base implants.The finite element model based on implants was defined by the steps of setting material properties,meshing,defining constraints,contact,and applying loads on the finite element model in Hypermesh software;two-stage implants and various angles were analyzed in Abaqus software.The stress distribution of the composite base implant under the action of the bite force;the stress distribution of each implant under different loading conditions is compared from the perspective of biomechanics;the vertical two-stage implant and the vertical composite base implants were compared and analyzed under the same loading condition;the influence caused by the change in base angle on the stress distribution of the composite base implants was analyzed.The characteristics of biomechanics on the basis of composite base implants were explored.3.Implant fatigue experimental analysis.An experimental platform for simulated implant fatigue loading was set up.The composite abutment implants and the two-stage implants at different angles were subjected to fatigue loading.The surface morphology before and after the loading of the experimental implants was scanned by electron microscopy scanning;the position output by the fatigue tester was used.Data and electron microscopy scans were used to compare the biomechanics of two-stage implants and vertical composite base implants.The effects of angle changes on the biomechanical characteristics of composite base implants were further explored,and the results of finite element analysis of the implants were verified.