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Related Experiment Videos

Viscosity of elastomeric impression materials.

T W Herfort, W W Gerberich, C W Macosko

    The Journal of Prosthetic Dentistry
    |October 1, 1977
    PubMed
    Summary
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    Elastomeric impression materials with shear thinning properties are versatile for dental applications. Their viscosity changes with shear rate, making them suitable for syringing, contrary to initial assumptions.

    Area of Science:

    • Materials Science
    • Biomaterials Engineering
    • Dental Materials Science

    Background:

    • Elastomeric impression materials are crucial in dentistry for accurate prosthodontic and orthodontic restorations.
    • Understanding the rheological properties of these materials is essential for optimizing their clinical application and performance.
    • Previous research has not fully explored the shear-thinning behavior and its implications for syringing applications.

    Purpose of the Study:

    • To investigate the shear-thinning properties of elastomeric impression materials.
    • To correlate viscosity characteristics with filler content and cross-linking behavior.
    • To evaluate the suitability of these materials for syringing applications based on their rheological profiles.

    Main Methods:

    • Rheological measurements were performed on various elastomeric impression materials, including Omniflex and Impregum.

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  • Viscosity was assessed at different shear rates to identify shear-thinning behavior.
  • The viscosity rise during the cross-linking (setting) phase was monitored over time.
  • Filler content was analyzed in relation to observed viscosity characteristics.

    • Main Results:

    • Certain materials, like Omniflex and Impregum, demonstrated significant shear-thinning properties, indicating potential as all-purpose materials.
    • A tenfold viscosity reduction with increasing shear rate was observed in several tested materials, suggesting suitability for syringing.
    • A correlation was established between the viscosity characteristics of impression rubbers and their filler content.
    • Monitoring viscosity during cross-linking confirmed the general accuracy of manufacturer-specified syringing times.

    Conclusions:

    • Shear-thinning behavior in elastomeric impression materials enhances their versatility and suitability for syringing.
    • Viscosity is influenced by filler content, providing insights for material formulation.
    • The study validates the clinical applicability of these materials, particularly for syringing, challenging previous assumptions about viscosity limitations.