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Related Experiment Videos

Working time of synthetic elastomeric impression material

R J McConnell1, L N Johnson, D R Gratton

  • 1Division of biomaterials science, faculty of dentistry, University of Western Ontario, London.

Journal (Canadian Dental Association)
|January 1, 1994
PubMed
Summary

A new method measures elastomeric impression material working times. Temperature significantly impacts material performance, with polysulfides showing the longest working times and silicones the shortest.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry

Background:

  • Existing methods for evaluating elastomeric impression materials have shortcomings.
  • Accurate measurement of working time is crucial for clinical success.

Purpose of the Study:

  • Introduce a novel method for assessing the working time of elastomeric impression materials.
  • Evaluate the influence of temperature on the working times of common impression materials.

Main Methods:

  • Determined working times of polysulfide, addition silicone, and polyether impression materials.
  • Tested materials at room temperature (20°C), refrigerated (6°C), and mouth temperature (35°C).

Main Results:

  • At 20°C, polysulfides had the longest working times; silicones had the shortest.

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  • Refrigeration (6°C) extended working times for polysulfides and silicones but rendered polyethers unusable.
  • Mouth temperature (35°C) reduced working times for all tested impression materials.

    • Conclusions:

    • Temperature is a critical factor influencing the working time of elastomeric impression materials.
    • The new method provides a more comprehensive evaluation of material performance under varying conditions.
    • Clinical handling and material selection should consider the impact of temperature on working time.