Mechanical Analysis of Overdenture Fixation

E. Blangino, C. Araoz, and M. Barba (Argentina)


Dental implant, numerical tests, implant, transversal isotropy.


In this study we show the results of some numerical tests performed on the fixation of a prosthesis on implants for complete mandible when the loads are similar to those expected in the masticatory action. The numerical simulation was performed by finite elements. The model, an axisymmetrical one, was built with elements that support axisymmetric and non-axisymmetric loads to simulate real loads. Several scenarios were analyzed. The results presented here are related with the behavior of the system, tested at static loads, for two type of implants (short and long) and two type of cortical bone (thick and thin). For short implants in thin cortical, the peak values for stresses in bone at the applied loads (both in tension and in compression) do not follow the same tendency as the other three cases, being, in this case, the screw who bears the greater stresses. This situation agrees with the response observed in clinical practice. The part of the implant inserted in the bone only supports significant loads at the cortical level, being the peak equivalent stress corresponding to horizontal loads five times greater than that one for vertical loads. These effects are totally hidden if a non realistic isotropic model is taken for the bone.

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