Finite Element Analysis in Stress Evaluation of Implant Connection

Objective: The aim of this study was to evaluate, with finite element analysis, the effect of implant connection type on stress values ​​and distribution pattern of implant-supported prostheses. Methods: Virtual three-dimensional models were obtained simulating three-element commercially pure titanium fixed prostheses supported by two implants of different connection (external-hexagon, internal-hexagon and morse-taper). The models were, submitted to axial loading (180 N in the first premolar and first molar; 280 N in the second premolar). Results: There was no significant difference between the von Mises maximum stress values ​​of none of the implant systems. Similar stress distribution patterns were observed for all connection. von Mises maximum stress values in cortical bone ranged from 31.3 MPa (HE) to 33.2 MPa (CM); in the cancelous bone ranged from 5.58 MPa (CM) to 7.1 MPa (HI). The retaining screws showed greater von Mises maximum stress values in the internal-hexagon connection (71.9 MPa) and in the external-hexagon (49.2 MPa). Conclusions: It was concluded that the implant connections has little influence on the magnitude of stresses developed in the assembly of the components studied.