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Effect of vertical misfit and clip material on stress distribution of overdentures under masticatory loading

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Abstract

Framework misfit is a common problem observed in overdentures, which might result in prosthetic and biological complications. The aim of this study was to evaluate the influence of vertical misfit and clip material on the stress distribution in an overdenture-retaining bar system under masticatory loading. A 3-D finite element model of a resorbed jaw was created, including two implants and a bar-clip retained overdenture. A pressure of 100 MPa was applied to the right mandibular first molar. Different vertical misfit levels (50, 100, and 200 µm) and clip materials (plastic or gold) were evaluated. Data were evaluated using von Mises stress and microstrain. Vertical misfit amplification caused an increase in the microstrain values in the peri-implant bone tissue next to the ill-fitted component and increased the stresses in the prosthetic screws. The clip material influenced the stress and microstrain distribution in the prosthetic components and bone tissue. The levels of vertical misfit seem to be closely linked with the stress values in the prosthetic screws, mainly to that of the ill-fitted component. The gold clip presented an increase in the stress compared to the plastic clip.

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Authors and Affiliations

  1. Restorative Dentistry Department, School of Dentistry, Federal University of Pelotas, Pelotas, RS, Brazil

    Mateus Bertolini Fernandes dos Santos

  2. Prosthodontics and Periodontics Department, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil

    Bruno Massucato Zen

  3. Prosthodontics Department, Meridional Faculty – IMED, Rua Senador Pinheiro, 302, 99070-220, Passo Fundo, RS, Brazil

    Atais Bacchi

Authors
  1. Mateus Bertolini Fernandes dos Santos
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  2. Bruno Massucato Zen
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  3. Atais Bacchi
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Correspondence to Atais Bacchi.

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dos Santos, M.B.F., Zen, B.M. & Bacchi, A. Effect of vertical misfit and clip material on stress distribution of overdentures under masticatory loading. Med Biol Eng Comput 54, 1515–1521 (2016). https://doi.org/10.1007/s11517-015-1426-0

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  • DOI: https://doi.org/10.1007/s11517-015-1426-0

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