Polyether Ketone Was Used For Finite Element Analysis Of Mandibular Sleeve Crown Implant Overdenture

Objective: Using three-dimensional finite element technology,by analyzing and comparing the stress distribution of polyether ether ketone(PEEK)and titanium(TI)as the upper support model of telescopic crown implant overdenture,this paper explores the mechanical properties of PEEK material as this type of denture support,so as to provide a theoretical basis for the application of PEEK in implant repair and provide a reference for the selection of clinical repair materials.Methods: a middle-aged and elderly patient with moderate alveolar bone absorption edentulous jaw was selected.With the consent of the patient,the complete denture was scanned by 3shape oral scanner to obtain STL files,and CBCT was taken to obtain DICOM data.Import DICOM data into Mimics software for 3D conversion of mandible.Import Geomagic wrap software to accurately process the model surface,import the built threedimensional solid model of mandible into NX 12.0 software,establish four implants,abutment and inner crown according to the requirements,integrate them with the threedimensional solid model of mandible according to the requirements,and design the outer crown and prosthesis support on them.The outer crown and prosthesis support are integrated(collectively referred to as support),and repair and integrate artificial teeth,base and support to form denture,The complete model of telescopic crown implant overdenture supported by four mandibular implants was established.In ABAQUS,the model is meshed and given the properties of materials.The experimental groups were divided into peek group and Ti group by changing the scaffold material.The boundary conditions of the two groups of models were limited,and the stress conditions of implant,implant bone interface,alveolar ridge surface and stent were observed under three different loads(vertical load 100 N of anterior teeth,vertical load100 N of posterior teeth and oblique load 100 N of posterior teeth).Results: 1 Under the three loading modes,the peak stress of implants in peek group and Ti group were distributed at the edge of implant neck;The stress of the two groups of model implants under oblique load is significantly greater than that under axial load;Under the three loading modes,the peak stress of PEEK group is smaller than that of Ti group.2.Under different loading methods,the peak parts of compressive stress and tensile stress at the implant bone interface of the two groups were located in the bone tissue around the implant neck;Under the three loads,the compressive stress is greater than the tensile stress in both groups.3.Under different loading modes,the stress distribution on the surface of alveolar ridge of the two material models is similar;Under the three loads,the peak stress of PEEK group is greater than that of Ti group;Comparing the peak stress of implant and alveolar ridge surface under the same model,the maximum peak stress of implant in peek group was 23 times that of alveolar ridge surface(under oblique load of posterior teeth)and 39 times that of Ti group(under vertical load of anterior teeth).4.Under the three loading modes,the stress distribution range of PEEK group is significantly smaller than that of Ti group,and the peak stress of PEEK support is much smaller than that of Ti group.Conclusion: 1 In the telescopic crown implant overdenture model,under the force loading in different directions at different sites,the peak stress mainly appears in the implant neck and the bone tissue around the implant neck.Therefore,the protection of implant neck is the key to the success of implant repair,which needs to be paid more attention in clinic.2.Under different loads,the implant stress shows that the oblique load is greater than the axial load.Clinically,the oblique force of denture should be reduced to prevent the formation of pathological load.3.Under the three loading modes,the telescopic crown implant overdenture with two support materials shows that the implant bears the main stress,and only a small part is borne by the alveolar ridge,indicating that the telescopic crown implant overdenture supported by four implants plays a good role in protecting the remaining alveolar bone.4.The three-dimensional finite element analysis shows that PEEK material as a telescopic crown implant overdenture support can protect the implant and reduce the stress,and the stress of the support itself is smaller,which is expected to be used in clinic.The specific clinical application effect needs to be studied and considered.