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Type: Artigo de periódico
Title: Effect of bar cross-section geometry on stress distribution in overdenture-retaining system simulating horizontal misfit and bone loss
Author: Spazzin, AO
Costa, AR
Correr, AB
Consani, RLX
Correr-Sobrinho, L
dos Santos, MBF
Abstract: This study evaluated the influence of cross-section geometry of the bar framework on the distribution of static stresses in an overdenture-retaining bar system simulating horizontal misfit and bone loss. Three-dimensional FE models were created including two titanium implants and three cross-section geometries (circular, ovoid or Hader) of bar framework placed in the anterior part of a severely resorbed jaw. One model with 1.4-mm vertical loss of the pen-implant tissue was also created. The models set were exported to mechanical simulation software, where horizontal displacement (10, 50 or 100 mu m) was applied simulating the settling of the framework, which suffered shrinkage during the laboratory procedures. The bar material used for the bar framework was a cobalt-chromium alloy. For evaluation of bone loss effect, only the 50-mu m horizontal misfit was simulated. Data were qualitatively and quantitatively evaluated using von Mises stress for the mechanical part and maximum principal stress and p-strain for pen-implant bone tissue given by the software. Stresses were concentrated along the bar and in the join between the bar and cylinder. In the pen-implant bone tissue, the mu-strain was higher in the cervical third. Higher stress levels and mu-strain were found for the models using the Hader bar. The bone loss simulated presented considerable increase on maximum principal stresses and mu-strain in the pen-implant bone tissue. In addition, for the amplification of the horizontal misfit, the higher complexity of the bar cross-section geometry and bone loss increases the levels of static stresses in the pen-implant bone tissue. (c) 2013 Elsevier Ltd. All rights reserved.
Subject: Implant prosthesis
Bone loss
Finite element analysis
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: Journal Of Biomechanics. Elsevier Sci Ltd, v. 46, n. 12, n. 2039, n. 2044, 2013.
Rights: fechado
Identifier DOI: 10.1016/j.jbiomech.2013.05.025
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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