Three-dimensional finite element analysis of the cantilever fixed bridge supported by implants with different shapes / 中国组织工程研究

ABSTRACT

BACKGROUND: The shape of the implant exerts an effect on its biomechanics. At present, the research of implant-supported fixed partial denture with cantilever extension mainly focuses on the same shape, and little is reported on the comparison and analysis of implant-supported fixed partial denture with cantilever extension supported by different shape implants.OBJECTIVE: To compare the biomechanical behaviors of cantilever fixed bridges which were supported by three different implants, including cylindrical implant, tapered implant, expandable implant, in the mandibular posterior region with the help of three-dimensional finite element analysis. METHODS: The three-dimensional finite element models of the cantilever fixed bridges which were supported by cylindrical implant, tapered implant and expandable implant and their surrounding tissue in the mandibular posterior region were established were established. The force of 300 N was applied to the cantilever fixed bridges with axial 90° and buccolingual 45° to evaluate the maximum von Mises stress (Max EQV stress) of cortical bone and cancellous bone and the maximum displacement in implant-abutment complex.RESULTS AND CONCLUSION: Under axial and buccolingual loads, the Max EQV stress in the cortical bone was higher than that in the cancellous bone. The cantilever fixed bridge which was supported by expandable implant had the lowest Max EQV stress in the cortical bone, especially under axial load, and exhibited the highest Max EQV stress in the cancellous bone. The cantilever fixed bridges supported by three different implants showed an increase in the Max EQV stress of the cortical bone and cancellous bone and the maximum displacement in implant-abutment complex under buccolingual load. The cantilever fixed bridge which was supported by expandable implant had the minimum maximum displacement in the buccolingual direction. To conclude, the cantilever fixed bridge which is supported by expandable implant has best stability.