Three Dimensional Finite Element Analysis Of Biomechanical Distribution Of Dental Implants With Immediate Loading

Objective:To analyze the stress distribution of bone around the dental implants with different angles lateral immediate loading with the method of three-dimensional finite element.Method:An adult edentulous mandible was adopted for CT scanning, extracting the mandible two value images, carrying on the mesh division to it and establishing the mandible three dimensional mesh model. Simulating the real shape of standard thread implant was embeded in the USIS(Universal Surgical Integration System),to establish the finite element model of mandible with dental implants for immediate loading .The models were immediately loaded with 150N by the angle of 0°,10°,20°,30°. The ANSYS were used to analyze the Von Mises stress and strain on the bone around dental implants .Result :The accurate finite element model of mandible with dental implants for immediate loading was successfully established. The three dimensional finite element analytical result shows: When axial load bone contact surface Von the Mises stress concentrated on the cortical bone of the implant cervix, the strain distribution was even, by the cortical bone of the implant cervix , the base bone substantia spongiosa and the thread contact spot substantia spongiosa bone was centralized; Lateral to different angle load when bone contact surface Von the Mises stress also concentrated on the cortical bone of the implant cervix ,but the maximum value was 4 times of the vertical loading, the strain distributed unevenly, mainly concentrated on the cortical bone of the implant cervix, the maximum value was 3 times of the axial loading; Along with the load angle increasing, the stress and the strain value also increased.Conclusion :When an axial force was immediately loaded,the stress value and the strain concentration value of bone interface around the dental implants were not apparently concentrated,the stress was distributed well. While a force was loaded, the stress values and the strain concentration value of bone interface around the dental implants apparently increased and the strain was distributed unevenly.Significance: The method of three-dimensional finite element was one of the most important ways in the biomechanical studies. Through the establishment of the finite element model of mandible with dental implants for immediate lateral loading ,we can acquired lots of data which could not be got in clinical or animal experiments, and we can carry on the study by simulating the real clinical cases. Ossteo-integration was the most essential proof of the dental implants acquiring the long-lasting success.The loaded state of dental implant was an important factor that influenced the interfacial surface of the ossteo-integration . The research of Sagara M, Akagawa Y, Nikai H, et al showed that the immediate implants could produce ossteo-integration with the bone. Using the method of three-dimensional finite element on the basis of ossteo-integration to analyze mechanical characteristics of the immediate implants could well guide clinical practices.