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Related Experiment Videos

Stress concentration in all-ceramic posterior fixed partial dentures

P Kamposiora1, G Papavasiliou, S C Bayne

  • 1Department of Prosthodontics, University of North Carolina at Chapel Hill, USA.

Quintessence International (Berlin, Germany : 1985)
|October 1, 1996
PubMed
Summary

This study found that 4.0 mm connectors significantly reduced stress in three-unit fixed partial dentures. In-Ceram material demonstrated the lowest stress levels, making it ideal for posterior dental prostheses.

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Area of Science:

  • Biomaterials Science
  • Dental Engineering
  • Computational Mechanics

Background:

  • Fixed partial dentures (FPDs) are common dental prostheses.
  • Material selection and connector design influence FPD longevity.
  • Understanding stress distribution is crucial for optimizing FPD performance.

Purpose of the Study:

  • To analyze stress distribution in three-unit FPDs using finite-element analysis.
  • To compare stress levels in FPDs made from Type III gold alloy, Dicor, and In-Ceram.
  • To evaluate the impact of connector height (3.0 mm vs. 4.0 mm) on stress patterns.

Main Methods:

  • Two-dimensional finite-element analysis (FEA) was employed.
  • Computer models simulated three-unit FPDs (mandibular first premolar to first molar).

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  • A central load of 10 MPa was applied to the prosthesis models.

    • Main Results:

    • Von Mises stresses concentrated in the connectors, particularly at the axial location.
    • 4.0 mm connectors exhibited 40% to 50% lower stress levels compared to 3.0 mm connectors.
    • In-Ceram models showed lower stress levels and a smaller percentage of material ultimate strength compared to gold alloy and Dicor.

    Conclusions:

    • Increasing connector height to 4.0 mm effectively reduces stress in posterior FPDs.
    • In-Ceram appears to be a superior material choice for posterior fixed partial dentures due to lower stress.
    • FEA is a valuable tool for optimizing dental prosthesis design and material selection.