Comparative finite element analysis of stress distribution in pilars of fixed dentures supported with tilted versus nontilted posterior implants

Liliane Pacheco de Carvalho, Bruno Sotto Maior, Pedro Paulo Feltrin, Artemio Luiz Zanetti, Raquel Virginia Zanetti, Alexandre Marcelo de Carvalho

Introduction: According to the all-on-four treatment concept, tilted posterior implants reduce distal cantilever length. Objective: By means of three-dimensional finite element analysis, to elucidate the biomechanics of these devices and evaluate the use of tilted versus nontilted posterior implants and angled abutments in the treatment of the edentulous jaws. Methods: Four three-dimensional mandible models were created to simulate cortical and cancellous bone. The models received four parallel implants with straight abutments, or two vertical implants and two posterior implants titled at 17 or 30 degrees with straight or angled abutments. All models received axial loading or off-axis loading on one or both sides of the prosthesis. Results: The greatest stress concentrations were found for vertical implants and angled abutments. Tilted posterior implants favored stress distribution. Conclusion: The all-on-four treatment concept and the use of straight abutments favored the biomechanics of implant-supported full dentures.

Keywords: Vertical implants. Tilted implants. Finite element analysis.

How to cite: Carvalho LP, Maior BS, Feltrin PP, Zanetti AL, Zanetti RV, Carvalho AM. Comparative analysis by means of finite elements of tension distribution in implant supported fixe prosthesis pilars by straight and inclined distal implants. Dental Press Implantol. 2013 Jan-Mar;7(1):95-104.

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