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Related Experiment Videos

Rheological properties of elastomers during setting.

J F McCabe1, T E Carrick

  • 1Dental Materials Science Unit, Dental School, Newcastle upon Tyne, United Kingdom.

Journal of Dental Research
|August 1, 1989
PubMed
Summary

Controlled stress rheometry reveals that elastomeric impression materials develop elasticity during setting, a crucial property not evident from viscosity or rigidity alone. This finding cautions against relying solely on simple measurements for evaluating clinical properties like working time.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Biomaterials Engineering

Background:

  • Elastomeric impression materials are vital in dentistry for accurate prosthodontic and orthodontic applications.
  • Understanding the setting process and rheological properties of these materials is crucial for clinical success.
  • Conventional methods may not fully capture the complex changes during material setting.

Purpose of the Study:

  • To investigate the dynamic rheological changes during the setting of elastomeric impression materials.
  • To compare the sensitivity of a controlled stress rheometer with conventional viscometers.
  • To evaluate the development of elasticity and its significance during the setting process.

Main Methods:

  • Utilized a controlled stress rheometer, measuring deformation under controlled torque.

Related Experiment Videos

  • Employed oscillatory mode to monitor viscosity, rigidity, and elasticity.
  • Tested five different polyvinylsiloxane elastomeric impression materials.

    • Main Results:

    • Polyvinylsiloxane impression materials exhibit a significant development of elasticity during setting.
    • This elastic development occurs at a rate not detectable through viscosity or rigidity measurements alone.
    • The controlled stress rheometer provided a more comprehensive understanding of material behavior.

    Conclusions:

    • Simple viscosity or rigidity measurements are insufficient for evaluating the clinically important working time of elastomeric impression materials.
    • The development of elasticity is a critical factor during the setting of these materials.
    • Controlled stress rheometry offers a superior method for characterizing the setting behavior of elastomeric impression materials.