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Related Experiment Videos

Permanent set and stress relaxation in elastomeric impression materials

W D Cook

    Journal of Biomedical Materials Research
    |July 1, 1981
    PubMed
    Summary

    The permanent set in dental elastomers depends on polymerization rate during deformation. Bond interchange reactions in specific materials also increase permanent set, while network entanglement allows rapid recovery.

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    Area of Science:

    • Materials Science
    • Polymer Chemistry
    • Dental Materials Science

    Background:

    • Elastomeric impression materials are crucial in dentistry for accurate prosthodontic and orthodontic applications.
    • Understanding the dimensional stability, specifically permanent set, of these materials is vital for clinical success.
    • Factors influencing permanent set, such as material age and deformation parameters, require detailed investigation.

    Purpose of the Study:

    • To investigate the permanent set of various elastomeric dental impression materials.
    • To determine the influence of material age, deformation duration, and deformation level on permanent set.
    • To elucidate the underlying mechanisms contributing to permanent set and recovery in these elastomers.

    Main Methods:

    • Testing a range of elastomeric impression materials.
    • Systematic variation of material age, deformation duration, and deformation level.
    • Utilizing stress relaxation experiments to analyze material behavior.
    • Evaluating the rate of elastic recovery after deformation.

    Main Results:

    • Permanent set is primarily governed by the polymerization rate at the time of deformation.
    • Condensation silicones and polysulfide elastomers exhibit additional permanent set due to bond interchange reactions.
    • Elastomers demonstrated rapid recovery rates from deformation, indicative of network entanglement.

    Conclusions:

    • Polymerization kinetics significantly impact the permanent set of dental elastomers.
    • Chemical reactions like bond interchange contribute to long-term dimensional changes in specific materials.
    • Network entanglement plays a key role in the elastic recovery properties of these dental materials.

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