3-Dimensional Finite Element Analysis Of Single Implant-supported Prosthesis With Three Different Occlusal Surface Designs

Teeth missing represents a group of clinically common disease, which mainly caused by caries and trauma, et al. Implant reparation is a promising method for those cases. The interface of bon-implant and stress transference of the bone-implant interface is key factors in success of implant rehabilitation. With the development of the implant material properties and maturity of osseointergration theory of the bone-implant interface. no\v how to make stress on the interface distributed reasonable is an attractive topic to researchers. This paper focus on stress distribution of the implant in three different models which cusp inclination are 45, 35, 25 degrees respectively The method we use is 3-dimensional finite element analysis(3D-FEA).A volunteer's mandible was scanned using helix computer tomography and then we got the data of the mandible's margin in digital instrument. We wrote ANSYS program files using these data. Three models were created, meshed, analyzed in computer. The result is below: there was a stress concentration area in the cortical bone around implant neck, but the maximum of stress located on the lingual side of implant's apical area. When cusp inclination was 45 degree and the load was 150 Newton, the maximum of von Mises stress was 65.42MPa and the maximum of von Mises stress was 130.84MPa when the load was 300 Newton; when cusp inclination was 35 degree and the load was 150 Newton, the maximum of von Mises stress was 55.81MPa and the maximum of von Mises stress was 90.05MPa when the load was 300 Newton; when cusp inclination was 25 degree and the load was 150 Newton, the maximum of von Mises stress was 21.4MPa and the maximum of von Mises stress was 40.74MPa when the load was 300 Newton.Conclusively, stress concentration located on cortical bone around the neck of implant and apical area of implant. Among three designs, 25 degrees inclination ofcusp was appropriate. In this situation, von Mises stress was minimal and didn't destroy bone-implant interface. Thus in clinical practice, we should optimize design of occlusal surface in order to improve success rate of implant rehabilitation. We think that 25 degrees inclination of cusp is ideal.