Effect of implant systems in differing bone densities on peri-implant bone stress: A 3 dimensional finite element analysis

Abstract

The purpose of this study was to evaluate and compare stress distributions of two commercially available dental implant systems, MIS SEVEN and OSSTEM TS III in differing bone densities using three-dimensional finite element analysis. Geometric models and structured meshing of dental implant assembly with peri-implant bone were constructed using CATIA and HYPERMESH softwares respectively. Interfaces of implant-bone assembly and abutment screw-implant complex were assumed to be rigidly bonded. Constraints were placed at the inferior border of the mandibular bone segment. Axial loads and oblique forces of 40 N were applied on occlusal surfaces of the dental crown-implant assembly. Maximum stress values were found to be less in reverse buttress threads in MIS implant system (170 MPa) compared to the V-shaped threads in OSSTEM implant system (250 MPa) in D2 and D3 bone densities. Higher stresses were found to be concentrated at the region of the implant abutment contact and neck of the abutment screw in both the implant systems. Irrespective of the implant system, maximum stresses were observed at the cortical bone compared to the cancellous bone in D2 and D3 bone. High stress values were located at the cervical bone regions adjacent to implant in both the implant systems.