Modelagem do comportamento estrutural de uma mandíbula edêntula com implantes vertical e angulado

Abstract

In this work, the mechanical behavior of two alternative designs for dental implants, part of the BIOFORM® system and manufactured by MAXTRON (Juiz de Fora, MG), were evaluated. The considered pieces were the vertical and the frontal angled implant. The stress distribution in these implants was analyzed using a finite element model of anedentulous mandible. The geometric model of mandible was obtained from a computerized tomography scan, while geometric models of implants were provided by manufacturer. Using Boolean operation tools available in the ANSYS® code, the geometric model for each implanttype was obtained through the intersection of bone mandible and implant volumes. The implants were positioned in the left first molar region. The change in the stress distribution was evaluated varying the displacement boundary condition in the condyles. The comparison between models including the complete mandibular and a model considering just the region where the implant was placed was then performed. Another consideration was the effect of including a layer of trabecular bone at the implant osseous contour, simulating the situation after the implant is consolidated. Finally, the evaluation of two geometric designs undervertical and horizontal loading was performed. As in previous works, in all evaluated cases the higher stress concentration occurred in the cervical portion. The angled implant demonstrated to be as efficient as the vertical implant, judging by the stress levels, an important result for a new proposed design.