Stress And Deformation Analysis Of The Denture Implant’s Adhesive Interface And Bonding Interface Under The Impact Force

The environment of human oral is complex, the implant denture is prone to arise problems after a long-term use, such as stretch porcelain and the secondary treatment process is easier to damage the adhesive surface and bone joint surface when the crown is removed. The different materials of binder, different adhesive layer thickness and the different position on the crown will affect the crown restoration. Currently, the clinicians who are lack of theoretical research to guide rely more on experience when they remove implant prosthesis crown, therefore this paper has important theoretical significance which researched the stress distribution trends and numerical, the deformation distribution trends and numerical on the implant denture’s adhesive interface and osseointegration interface under impact load, then choose the reasonable adhesive materials、 reasonable adhesive thickness and the appropriate point in implants.Through the establishment of the implant dentures finite element model and design twelve conditions for the zinc polycarboxylate cements, the glass ionomer cement, zinc phosphate cement and four different loading points on crown which are widely applied on the clinical by using the Workbench transient dynamics simulation module, then this paper got the results that the distribution of stress and deformation, the size of the peak stress and deformation on adhesive interface and osseointegration interface. The results showed that:there is little relationship between stress and deformation distribution trends with the materials of binder, the deformation of bonding interface is mainly distributed in the top of the area which the binder surface contact w ith abutment surface, the deformation of bone joint surface is mainly distributed in the neck area which the bone cortical surface contact with implant surface; when an impact load was applied in two different locations on buccal crown, the area of neck buccal shoulder and buccal screw thread which the bone cortical surface contact with implant surface has stress concentration phenomenon, it’s a larger area for the risk of failure; when an impact load was applied in two different locations on lingual crown, the area of neck lingual shoulder and lingual screw thread which the bone cortical surface contact with implant surface has stress concentration phenomenon, it’s a larger area for the risk of failure.By comparing the size of the peak stress and deformation can be drawn:when the load was applied in the four positions on crown, the maximum principal stress on the binder surface are larger than the resistant tensile strength of the corresponding material; when the load was applied on the lingual neck of crown, the adhesive surface of the abutment and the implant-alveolar combined surface caused minimal damage; when the zinc phosphate cement as the material of binder, the stress of abutment surface adhesion was27.522MPa, which was higher than the stress of the glass ionomer cement and zinc phosphate cement by9.6%and14.8%, which causing the higher risk of injury.Based on the parameterized model of implant dentures, this paper used the Design Exploration module on Workbench to analyzes the impact of continuously change when the adhesive thickness layer in the range of20μm-150μm for the adhesive interface and bonding interface. The result showed that:there is no influence for the peak of stress on the adhesive interface and the peak of stress and deformation on implant-alveolar interface by the adhesive thickness layer continuously change; when the adhesive thickness layer was in the50μm-53μm, the adhesive surface of abutment caused minimal damage, while the impact load can make sure of the crown restoration.Through the above simulation results provide reference value for the implant denture treatment on the clinical.