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Related Experiment Videos

Dimensional stability of silicone-based impression materials.

V Fano1, P U Gennari, I Ortalli

  • 1Istituto di Scienze Fische, dell'Universita, Parma, Italy.

Dental Materials : Official Publication of the Academy of Dental Materials
|March 1, 1992
PubMed
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Evaporation of constituents, not just polymerization, causes shrinkage in silicone impression materials. Time-dependent analysis reveals distinct polymerization and evaporation shrinkage contributions over time.

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Dental Materials

Background:

  • Silicone-based impression materials are widely used in dentistry.
  • Shrinkage of these materials can affect the accuracy of dental impressions.
  • The primary cause of shrinkage has been attributed to polymerization reactions.

Purpose of the Study:

  • To investigate the contribution of constituent evaporation to the shrinkage of silicone-based impression materials.
  • To differentiate between polymerization shrinkage and evaporation shrinkage.
  • To analyze the time-dependent dimensional changes in different types of silicone impression materials.

Main Methods:

  • Experimental testing of condensation and addition polymerizing silicone impression materials with varying viscosities.

Related Experiment Videos

  • Analysis of time-dependent dimensional changes using chemical kinetics and shrinkage diagrams.
  • Evaluation of time-dependent shrinkage profiles to separate shrinkage contributions.

    • Main Results:

    • Polymerization shrinkage is typically complete within a few hours.
    • Evaporation of constituents can also contribute significantly to material shrinkage.
    • Distinct contributions of polymerization and evaporation shrinkage can be identified through time-dependent analysis.
    • Different viscosities and polymerization types influence the extent and timing of shrinkage.

    Conclusions:

    • Shrinkage in silicone impression materials is influenced by both polymerization and evaporation.
    • Evaporation shrinkage can be a significant long-term factor, independent of polymerization.
    • Time-dependent shrinkage analysis is crucial for understanding and quantifying these different shrinkage mechanisms.