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Impression materials.. and electrodeposits. Part I: Impression materials.

J A Stackhouse

    The Journal of Prosthetic Dentistry
    |January 1, 1981
    PubMed
    Summary
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    Impression materials exhibit minor shrinkage, affecting electrodeposit dimensions. Temperature influences polymerization shrinkage and stability, with Polyjel expanding in plating baths.

    Area of Science:

    • Materials Science
    • Dental Materials Science

    Background:

    • Accurate dental impressions are crucial for prosthodontic restorations.
    • Understanding the dimensional stability of impression materials is vital for predictable outcomes.

    Purpose of the Study:

    • To evaluate the dimensional stability of two dental impression materials (President and Polyjel) after polymerization.
    • To assess the impact of polymerization temperature and environmental exposure on material dimensions.

    Main Methods:

    • Specimens of President and Polyjel were polymerized under different temperature conditions.
    • Dimensional changes were measured after polymerization and during a 3-week bench set.
    • Material stability was tested during immersion in acid and alkaline electroplating baths.

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    Main Results:

    • All impression materials showed shrinkage between 0.07% and 0.23% compared to the master die.
    • Room temperature polymerization resulted in slight initial shrinkage, followed by stability.
    • Higher temperature polymerization led to significant initial dimensional changes upon cooling, then stability.
    • President demonstrated minimal change in an acid electroplating bath.
    • Polyjel exhibited expansion in both acid and alkaline electroplating baths.

    Conclusions:

    • Dental impression materials undergo measurable shrinkage, influencing subsequent fabrication processes like electrodeposition.
    • Polymerization temperature significantly impacts the initial dimensional stability of impression materials.
    • Polyjel shows dimensional instability when exposed to electroplating baths, potentially affecting electrodeposit accuracy.