Medical Engineering & Physics
Volume 30, Issue 2 , Pages 218-225, March 2008

A complete finite element model of a mandibular implant-retained overdenture with two implants: Comparison between rigid and resilient attachment configurations

  • M. Daas

      Affiliations

    • Faculty of Dental Surgery, René Descartes University, Paris V, 92000 Montrouge, France
    • ,
  • G. Dubois

      Affiliations

    • Laboratory of Physics and Mechanics of Materials, Ecole Nationale d’Ingénieurs de Metz, Ile du Saulcy, 57045 Metz Cedex, France
    • Orthopédie Biomécanique Locomotion, 92320 Châtillon, France.
    • ,
  • A.S. Bonnet

      Affiliations

    • Laboratoire de Fiabilité Mécanique, Ecole Nationale d’Ingénieurs de Metz, Ile du Saulcy, 57045 Metz Cedex, France
    • Corresponding Author InformationCorresponding author. Tel.: +33 387344264
    • ,
  • P. Lipinski

      Affiliations

    • Laboratoire de Fiabilité Mécanique, Ecole Nationale d’Ingénieurs de Metz, Ile du Saulcy, 57045 Metz Cedex, France
    • ,
  • C. Rignon-Bret

      Affiliations

    • Faculty of Dental Surgery, René Descartes University, Paris V, 92000 Montrouge, France

Received 14 March 2006; received in revised form 9 February 2007; accepted 12 February 2007. published online 31 March 2007.

Abstract 

Purpose

The aim of this study was to evaluate the influence of the retention mechanism on the behavior of a mandibular implant-retained overdenture (IRO) during the simulation of mastication. Therefore, a complete three-dimensional finite element model of a mandible with its IRO was developed.

Materials and methods

The geometry of the edentulous mandible and overdenture was generated from computed tomography. Two MKIII® implants (Nobel Biocare) with ball abutments and Dalbo Plus® (Cendres et Métaux) attachments were placed in the canine areas. Three foodstuff positions were analyzed for two retention mechanisms, “resilient” or “rigid”. Special attention was given to the modeling of the mandibular environment and of the existing contact between the different components. A probable muscular action was determined following the minimal work principle.

Results

The food-crushing force was provided by masseters with a two-third/one-third ratio between working and non-working sides. The “resilient” configuration provided a wider contact area between the mucosa of the denture bearing area and the prosthesis. An increase of the mastication force transiting through the mucosa was also noted and lower stresses were observed in the bone surrounding implants.

Conclusion

Resilient attachments allowed for an increase of the mastication load transiting through denture bearing surface. Furthermore, this study proposed an accurate model of the mandibular IRO, including its environment and faithful behavior reproduction.

Keywords: Biomechanics, Dental implants, Mandible, Overdenture attachment, Finite element model

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PII: S1350-4533(07)00037-9

doi:10.1016/j.medengphy.2007.02.005

Medical Engineering & Physics
Volume 30, Issue 2 , Pages 218-225, March 2008

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