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Related Experiment Videos

Rigidity of elastomeric impression materials.

K D Jamani1, E Harrington, H J Wilson

  • 1Department of Dental Prosthetics and Periodontics, University of Birmingham, U.K.

Journal of Oral Rehabilitation
|May 1, 1989
PubMed
Summary
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Dental impression materials need optimal rigidity for accurate casts. This study measures elastic modulus during setting, finding values increase significantly within 30 minutes for elastomeric materials.

Area of Science:

  • Materials Science
  • Dental Materials Science
  • Polymer Science

Background:

  • Dental impression materials require a balance of flexibility for undercuts and rigidity for cast pouring.
  • Inadequate rigidity can lead to impression distortion and inaccurate dental prosthetics.
  • Understanding the setting process and mechanical properties is crucial for material selection.

Purpose of the Study:

  • To develop and present a method for determining the elastic modulus of dental impression materials during their setting phase.
  • To quantify the change in elastic modulus over time, from initial setting to 30 minutes post-mixing.
  • To provide elastic modulus data for a range of elastomeric impression materials.

Main Methods:

  • A novel method was employed to measure the elastic modulus of impression materials at various time points after mixing.

Related Experiment Videos

  • Measurements were taken starting from the initial setting time and continued up to 30 minutes.
  • The study focused on elastomeric impression materials commonly used in dentistry.

    • Main Results:

    • The elastic modulus of the tested impression materials significantly increased from the initial setting time up to 30 minutes post-mixing.
    • This increase indicates a progressive stiffening of the material as it cures.
    • Specific elastic modulus values at different time points were recorded for representative materials.

    Conclusions:

    • The elastic modulus of elastomeric impression materials increases substantially during the first 30 minutes after mixing.
    • The developed method allows for early assessment of material rigidity, crucial for clinical application.
    • These findings aid in selecting appropriate impression materials based on their setting characteristics and mechanical properties.