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Related Experiment Videos

Behavior of three high-Cu amalgams.

D B Mahler

    Journal of Biomedical Materials Research
    |September 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    High-copper dental amalgams exhibit a distinct creep behavior linked to mercury content. One alloy

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    Operative dentistry·1996

    Area of Science:

    • Dental Materials Science
    • Materials Engineering

    Background:

    • Dental amalgams are widely used restorative materials.
    • High-copper amalgams offer improved corrosion resistance and mechanical properties.
    • Understanding creep behavior is crucial for long-term restoration success.

    Purpose of the Study:

    • To investigate the creep behavior of high-copper dental amalgams.
    • To determine the relationship between final mercury content and creep.
    • To identify potential differences in creep initiation among similar alloys.

    Main Methods:

    • Three single-composition high-copper alloys were prepared.
    • Creep was measured as a function of final mercury content.
    • Phase analysis was correlated with creep data.

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    Main Results:

    • All alloys demonstrated a significant increase in creep at approximately 46% final mercury content.
    • This creep jump is associated with the formation of the tin-mercury (gamma 2) phase.
    • Two alloys are expected to have final mercury content below this threshold in clinical use, while one is expected to exceed it.

    Conclusions:

    • The formation of the gamma 2 phase significantly impacts amalgam creep.
    • Clinical mercury content relative to the creep jump threshold is a critical factor for restoration longevity.
    • Further investigation is needed to understand the clinical implications of expected gamma 2 phase formation in certain high-copper amalgams.