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Dimensional changes of a high-tin content amalgam

G C Paffenbarger, N W Rupp, P R Patel

    Journal of Dental Research
    |December 1, 1982
    PubMed
    Summary
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    Brewster amalgam showed minimal dimensional change initially. However, over five years, it expanded significantly when stored in air at various temperatures, approaching stability around 50 months.

    Area of Science:

    • Dental Materials Science
    • Metallurgy
    • Materials Science

    Background:

    • Dental amalgam is a widely used restorative material.
    • Understanding the long-term dimensional stability of dental alloys is crucial for clinical success.
    • Brewster Alloy is a specific dental amalgam composition.

    Purpose of the Study:

    • To evaluate the initial dimensional stability of Brewster Alloy amalgam.
    • To assess the long-term dimensional changes of Brewster Alloy amalgam when stored in air at different temperatures.

    Main Methods:

    • Brewster Alloy (62% Ag, 33% Sn, 5% Cu, 0.2% Zn) was prepared into amalgam.
    • Amalgam specimens were stored for 24 hours at 23°C to measure initial dimensional change.
    • Further specimens were stored in air for five years at 60°C, 37°C, and 23°C to measure expansion.

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    Main Results:

    • Amalgam made with Brewster Alloy exhibited minimal dimensional change within 24 hours at 23°C.
    • Over a five-year storage period in air, Brewster amalgam showed significant expansion: 186 microns/cm at 60°C, 68 microns/cm at 37°C, and 14 microns/cm at 23°C.
    • The material approached a "stable" condition after approximately 50 months of storage.

    Conclusions:

    • Brewster Alloy amalgam demonstrates good initial dimensional stability.
    • Long-term storage in air leads to significant expansion, with higher temperatures accelerating the process.
    • Clinical implications regarding the long-term behavior of this amalgam in oral environments warrant further investigation.