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Related Experiment Videos

The tooth-denture base bond: stress analysis using the finite element method

U R Darbar1, R Huggett, A Harrison

  • 1Department of Prosthetic Dentistry & Dental Care of the Elderly, University of Bristol Dental School.

The European Journal of Prosthodontics and Restorative Dentistry
|March 1, 1993
PubMed
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Acrylic resin teeth in dentures often fracture at the interface. Finite element analysis revealed maximum tensile stresses occur within the tooth body, not at the interface, explaining denture tooth failures.

Area of Science:

  • Biomaterials Science
  • Dental Materials Science
  • Mechanical Engineering

Background:

  • Acrylic resin teeth are widely used in dentures.
  • Fracture at the tooth-denture base interface is a common failure mode.
  • Localized tensile stresses are hypothesized to cause this fracture.

Purpose of the Study:

  • To investigate the stress distribution in artificial teeth during loading.
  • To determine the location of maximum tensile stresses in acrylic resin denture teeth.
  • To evaluate the role of the tooth-denture base interface in denture tooth fracture.

Main Methods:

  • Utilized the finite element method (FEM) for stress analysis.
  • Simulated load application on upper incisors of artificial teeth.

Related Experiment Videos

  • Analyzed stress concentrations at the tooth-denture base interface and within the tooth body.

    • Main Results:

    • Maximum tensile stresses were concentrated within the body of the acrylic resin tooth.
    • Stresses at the tooth-denture base interface were relatively low.
    • Introducing a crack at the interface did not significantly alter stress magnitudes.

    Conclusions:

    • The common failure of acrylic resin denture teeth is likely due to stresses within the tooth body, not at the interface.
    • The tooth-denture base interface is not the primary site of stress concentration leading to fracture.
    • Rethinking denture tooth design may be necessary to prevent fractures.