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Related Experiment Videos

Comparative elasticity tests for elastomeric (non putty) impression materials.

P A Blomberg1, S Mahmood, R J Smales

  • 1University of Adelaide.

Australian Dental Journal
|October 1, 1992
PubMed
Summary
This summary is machine-generated.

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This study evaluated methods for measuring elastic recovery in elastomeric impression materials. Results indicate a single test method can effectively determine deformation set percentage across different material types.

Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Materials Science

Background:

  • Accurate measurement of elastic recovery is crucial for evaluating elastomeric impression materials.
  • Various testing methods exist, but their comparability and reliability across different material types require investigation.
  • Understanding material deformation set is essential for clinical performance and material selection.

Purpose of the Study:

  • To evaluate and compare different methods for measuring the elastic recovery of elastomeric impression materials.
  • To determine the influence of mould material and testing apparatus on deformation set measurements.
  • To establish the optimal testing duration for accurate elastic recovery assessment.

Main Methods:

  • Selected one brand from each chemical group (polysulphide, silicone, polysiloxane, polyether) for testing.

Related Experiment Videos

  • Employed compression tests using both metal and acrylic moulds.
  • Utilized BSI balanced beam method and an optical method for compression testing.
  • Conducted tensile, bend, and torsion tests to assess elastic recovery over time.

    • Main Results:

    • Mould material significantly affected deformation set in polysulphide and silicone specimens but not polysiloxane or polyether.
    • Compression testing method influenced set percentage for polysulphide and polyether, but not silicone or polysiloxane.
    • Elastic recovery stabilized within ten minutes for most tests, except tensile tests which required twenty minutes.
    • Rank ordering of deformation set showed correlation across compression, tensile, bend, and torsion methods.

    Conclusions:

    • The choice of mould material and testing method can influence the measured elastic recovery of elastomeric impression materials.
    • A consistent strain release period is necessary, with tensile tests requiring longer durations.
    • A single, standardized testing method appears sufficient for determining the deformation set percentage across various elastomeric impression materials.