Evaluation using FEM on the stress distribution on the implant, prosthetic components and crown, with Cone Morse, external and internal hexagon connections

Márcio de Carvalho Formiga, Ricardo Tatsuo Inoue, Raquel Virginia Zanetti, Artemio Luiz Zanetti, Marcelo Luchesi Teixeira, Flávio Takamatsu

Objective: The aim of this study was to compare the stress distribution between implant systems with different types of connections, i.e., external hexagon, internal hexagon and morse taper, by applying the Two-Dimensional Finite Element Method. Methods: A 100-N load was applied to the buccal cusp of an inferior second premolar in the axial direction and thereafter at an inclination of 45o on each system. Analysis was performed by means of the von Mises stresses criteria. Results: The results showed that in, all systems, the highest stress concentration occurred in the neck of the implant in contact with the cortical bone, except for the morse taper models, where the stress was concentrated in the inner portion of the implant in contact with the abutment. It also became apparent that oblique forces resulted in higher stress values than those obtained with axial loads. Conclusion: It could be concluded that abutment screws are the most fragile portion of the systems. Internal connection implant systems exhibited a more uniform distribution of stresses than external connection implant systems.

Keywords: Finite element method. Bone/implant connection. Von Mises stresses.

How to cite: Formiga MC, Inoue RT, Zanetti RV, Zanetti AL, Teixeira ML, Takamatsu F. Evaluation using FEM on the stress distribution on the implant, prosthetic components and crown, with Cone Morse, external and internal hexagon connections. Dental Press Implantol. 2013 July-Sept;7(3):67-75.

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