Three-dimensional finite element analysis of different six-implants position and different implants supporting fixed prosthesis in edentulous mandibular

• 1、School of Stomatology,Lanzhou University,Lanzhou 730000

Abstract：Objective:To establish a model of edentulous mandible, implants, mandibular full-arch and segmental-arch prosthesis; and to analyze the stress distribution of different sites in the full-arch and segmental-arch fixed prosthesis of edentulous jaw supported by six implants. To evaluate and clarify the clinical effects of different designs supported by six implants from the perspective of biomechanics. Methods:Obtaining the three-dimensional data of the upper and lower jaws of adult normal jaws by CT scanning. Establishing the model of edentulous mandible、implants and prosthesis by using Mimics, 3-matic, GeomagicStudio, SolidWorks on the computer. Analyzing the stress distribution of the supporting tissues of different six-implants sites designs and different implants supporting fixed prosthesis in mandibular by using the ABAQUS software.Results:The implants sites designs of 7,5,1, and 7,4,2, and 7,4,1 in the edentulous mandible with full-arch fixed prosthesis supported by 6 implants has a lower peak stress; the two-segmental-arch prosthesis designs are 7,5,1, and 7,4,1; and the three-segmental-arch prosthesis designs have a large value of stress distribution which are beyond the maximum stress of cortical bone can withstand. Conclusions:The cortical bone around the top of the implant and the top of the implant were stress concentration areas. The full-arch type is apt to reduce the incidence of alveolar bone resorption. There is a large concentration of stress in the top of the implant of three-segmental-arch prosthesis designs , which may have a greater risk of bone resorption.

Keywords： Edentulous Fixed restoration supported by six-implants, Full-arch prosthesis Segmental-arch prosthesis Three-dimensional finite element analysiskey