3D Finite Element Analysis of Two Modified Implant-Abutment Connections

The present study focused on modifying the implant-abutment connection in order to minimize crestal bone stress. Two modifications, based on two strategies, were studied. Three virtual 3D models were created including implant-abutment complex placed on bony tissues. The first model represented the conventional design; the second was modified by creating relief at implant hex area while a shock absorber was incorporated at the third design. Using finite element software, two simulations per design were applied, one at vertical 100 N load and the second by oblique (45º) 30 N load. Maximum and minimum principle stresses of the cortical and cancellous bones were assessed. The results of the vertical load showed highest stress value at the second design followed by conventional design then the third design was the least value. The oblique load generated highest value at the second design followed by third design then conventional design. Within the limitations of the study, it could be concluded that, although the proposed designs were not fully successful to reduce crestal bone stress but they changed the stress distribution of the conventional design.