Comparative Evaluation of Three Abutment-Implant Interfaces on Stress Distribution in and Around Different Implant...

This study was conducted to compare and evaluate the effect of three abutment-implant connections on stress distribution around three different implants under similar material properties and loading condition using finite element analysis (FEA).

Three different types of implant-abutment connections were selected. The features of these connections are Sample A: Tri-channel internal connection (Nobel Biocare); Sample B: Internal conical-hex Morse Taper (ADIN); and Sample C: Internal octa-Morse taper method (Osstem). The following softwares - ANSYS Version: 14.5 for FEA; Meshing software: Hypermesh 11; and CATIA: to produce computerized models of implants and for mandibular modeling were used. The implants were scanned with a high-quality scanner. All the above data were used to produce computerized models by CATIA software. Within the implant system, finite element method modeling was performed by implementing bonded conditions on the abutment-implant interfaces implementing four different load conditions. The computerized model was transferred to ANSYS software. A statistical analysis was done to compare the groups.

The samples were evaluated using three-dimensional FEA analysis. It was found that stress at 100 N, 100 N with 15° tilt, 300 N, and 300 N with 15° tilt was found to be highest in Sample A followed by Sample C and Sample B, and the difference was statistically insignificant.

Within the limitations of the present study, the tri-channel internal connection showed maximum stresses and least by the internal conical-hex Morse Taper and internal octa-morse taper connection.