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Related Experiment Videos

Rheological properties of vinyl polysiloxane impression pastes.

J E Martinez1, E C Combe, I J Pesun

  • 1Department of Restorative Sciences, College of Dental Medicine, Nova Southeastern University, Fort Lauderdale, FL, USA.

Dental Materials : Official Publication of the Academy of Dental Materials
|September 25, 2001
PubMed
Summary

Vinyl polysiloxane (VPS) dental impression materials exhibit thixotropy for non-drip properties. Both Imprint II and Examix showed thixotropy, with Imprint II also demonstrating yield stress, enhancing its non-drip performance.

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Area of Science:

  • Dental Materials Science
  • Rheology

Background:

  • Vinyl polysiloxane (VPS) materials are widely used for dental impressions.
  • Thixotropy is a desirable property for VPS materials, providing 'non-drip' characteristics.

Purpose of the Study:

  • To investigate the rheological properties of VPS materials.
  • To determine the flow properties relevant to dental applications.

Main Methods:

  • Assessed rheological characteristics of two low-viscosity VPS materials using a Dynamic Stress Rheometer.
  • Utilized cone and plate geometry for measurements.

Main Results:

  • Both Imprint II pastes exhibited yield stress and thixotropy.
  • Examix pastes lacked yield stress, but the catalyst paste showed significant thixotropy.

Related Experiment Videos

  • Both products demonstrated thixotropic properties.

    • Conclusions:

    • The combination of yield stress and thixotropy in VPS materials prevents material drip.
    • These properties ensure material stability during tray insertion and seating.