Abstract

ROLDAN VALENCIA, Frank Marcel; ESCOBAR RESTREPO, Julio César; LATORRE CORREA, Federico  and  VILLARRAGA OSSA, Junes. LINEAR AND NONLINEAR ANALYSIS EFFORTS IN ABUTMENTS OF PREFORMED ZIRCONIUM. FINITE ELEMENT. Rev. ing. biomed. [online]. 2014, vol.8, n.16, pp.39-50. ISSN 1909-9762.

The purpose of this study was to determine the mechanical behavior between Zimmer® zirconium implant abutments with and without a titanium washer at their base, by using the finite element analysis (FEA). Materials and Methods: two models of a zirconium abutment on implants were designed, composed of a Zimmer® titanium implant a fixation screw, cortical and cancellous bone, and the ceramic crown of an upper central incisor. An oblique force was applied with a magnitude of 200N, ascending in a scale of 200N until any of the components of the model exhibited a nonlinear behavior. Von Mises stresses were calculated for each element. Results: No significant differences on von Mises stresses were observed between the abutments with and without a titanium washer (280, 1MPa with a titanium washer, and 280, 4 MPa without it) but differences were found at the fixation screw and the implant: the stresses were lower in the model with a titanium washer (474MPa vs 576,7MPa). Both the bone and the crown exhibited non linearity at 600N, the implant and the screw at 1000N, and both zirconium abutments at 1400N. Conclusions: When the preload stress applied to both models is the adequate, no mechanical behavior differences between the abutments occur.

Keywords : Mechanical behavior; Zirconium abutment; Finite element method; Non linear.

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