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Related Experiment Videos

Custom impression trays: Part I--Mechanical properties

L C Breeding1, D L Dixon, J P Moseley

  • 1Department of Oral Health Practice, University of Kentucky, College of Dentistry, Lexington.

The Journal of Prosthetic Dentistry
|January 1, 1994
PubMed
Summary
This summary is machine-generated.

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Custom impression trays require dimensional stability for accurate dental casts. This study found thermoplastic resins less strong and elastic than polymethyl methacrylate and light-polymerizing resins.

Area of Science:

  • Dental materials science
  • Biomaterials engineering

Background:

  • Dimensional stability of custom impression trays is crucial for master cast accuracy.
  • Trays must resist deformation during impression removal from the oral cavity.
  • Mechanical property measurement aids in comparing tray materials and understanding removal stresses.

Purpose of the Study:

  • To compare the mechanical properties of five different custom impression tray resins.
  • To evaluate the suitability of various resin types for dental applications.

Main Methods:

  • Mechanical properties of five tray resins were recorded and compared.
  • Resins included one autopolymerizing polymethyl methacrylate, one light-polymerizing resin, and three thermoplastic resins.

Main Results:

Related Experiment Videos

  • Thermoplastic resins showed lower strength and elastic modulus compared to other tested resins.
  • Autopolymerizing polymethyl methacrylate and light-polymerizing resins demonstrated superior mechanical properties.

Conclusions:

  • The mechanical properties of thermoplastic resins may limit their use in applications requiring high dimensional stability.
  • Polymethyl methacrylate and light-polymerizing resins appear more suitable for custom impression trays demanding greater strength and rigidity.