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Related Experiment Videos

Custom impression trays. Part III: A stress distribution model

J P Moseley1, D L Dixon, L C Breeding

  • 1Department of Restorative Dentistry, School of Dentistry, University of Alabama, Birmingham.

The Journal of Prosthetic Dentistry
|May 1, 1994
PubMed
Summary

Custom dental impression trays made from various resins are unlikely to permanently deform under typical use. Stress analysis confirmed that forces during impression removal remain below the plastic deformation threshold for common tray materials.

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Area of Science:

  • Materials Science in Dentistry
  • Biomaterials Engineering
  • Dental Prosthodontics

Background:

  • Custom impression trays are essential in prosthodontics for accurate dental impressions.
  • Resins used for trays can undergo plastic deformation, potentially affecting tray integrity.
  • Understanding material properties under functional stress is crucial for clinical performance.

Purpose of the Study:

  • To mathematically model and experimentally validate stress distribution in custom dental impression trays.
  • To compare predicted stresses during impression removal with the yield stress of common tray resins.
  • To assess the risk of permanent deformation in thermoplastic and other custom tray materials.

Main Methods:

  • Development of a simplified mathematical model for custom tray stress analysis.

Related Experiment Videos

  • Experimental stress analysis to validate the predictive accuracy of the mathematical model.
  • Calculation of maximum stresses experienced by the tray during clinical impression removal.

    • Main Results:

    • The mathematical model accurately predicted stress distributions within the custom tray.
    • Predicted stresses during impression removal were significantly lower than the yield stress for polymethyl methacrylate and light-polymerized resins.
    • Experimental stresses approached yield stress values for thermoplastic resins, but remained within safe limits.

    Conclusions:

    • Commonly used resins in custom impression trays are unlikely to experience permanent deformation under typical clinical forces.
    • The study provides evidence supporting the use of thermoplastic and other tested resins for custom tray fabrication.
    • Further investigation into specific thermoplastic resins under high-stress conditions may be warranted.