FINITE ELEMENTS ANALYSIS OF STRESS PEAKS IN IMPLANTS WITH DIFFERENT LENGTHS

Aim: the purpose of this study was to evaluate, through the finite elements method, the stress peak values in implants submitted to axial and oblique loads. Methods: from a three-dimensional virtual simulation, an external hexagonal connection implant was modeled with 5.5 mm, 10 mm and 18 mm lengths. The test was conducted under application of axial and oblique loads of 60 N on the occlusal surface of the prosthetic crown from a virtual reconstruction of computed tomography. The simulation was analyzed numerically and qualitatively according to the principal stresses (tensile-compression). Results: the results showed that the oblique load induces higher stress peaks compared to the axial load. Stresses were located in the first threads of the implant and the peri-implant region. The implant of smaller length presented the highest stress peak. The stress peak values decreased an average of 28.3% with the average increase in implant length from 5 to 18 mm, and 7.75% from 10 to 18 mm. Conclusion: although the stress peak values decreased with the increase of the length from 5.5 mm to 18mm, the variations from 10 to 18 mm did not influenced the stress peaks.