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Related Experiment Videos

Apparent viscosities of setting elastomers.

S G Vermilyea, E F Huget, L B de Simon

    Journal of Dental Research
    |July 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    Five elastomeric impression materials were studied for their flow behavior using extrusion viscometry. All materials exhibited non-Newtonian properties and increased viscosity over time.

    Area of Science:

    • Materials Science
    • Rheology
    • Biomaterials Engineering

    Background:

    • Elastomeric impression materials are crucial in dentistry for accurate prosthodic and restorative work.
    • Understanding their rheological properties, such as viscosity and flow behavior, is essential for clinical success.
    • Previous studies have explored various aspects, but a comprehensive comparison of flow dynamics under specific conditions is needed.

    Purpose of the Study:

    • To characterize and compare the flow behavior of five different elastomeric impression materials.
    • To determine the initial viscosity and shear-thinning characteristics of these materials.
    • To investigate the time-dependent viscosity changes (thixotropy) in elastomeric impression materials.

    Main Methods:

    • Extrusion viscometry was employed to measure the flow properties of five elastomeric impression materials.

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  • Viscosity measurements were taken at a consistent shear rate of 2.2 reciprocal seconds.
  • The study recorded initial viscosity and monitored changes over time to assess time-dependent behavior.

    • Main Results:

    • Initial viscosity varied significantly across the five materials, ranging from 400 to 5,100 poise.
    • All tested elastomers demonstrated non-Newtonian flow behavior, indicating shear-dependent viscosity.
    • A consistent increase in viscosity over time was observed for all materials, suggesting a thixotropic or similar time-dependent effect.

    Conclusions:

    • The rheological properties of elastomeric impression materials are complex and material-dependent.
    • Non-Newtonian behavior and time-dependent viscosity changes are significant factors influencing the handling and performance of these dental materials.
    • Further research into optimizing the flow characteristics of impression materials could enhance clinical predictability and patient outcomes.