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Related Experiment Videos

High copper alloys for dental amalgam

D R Beech

    International Dental Journal
    |September 1, 1982
    PubMed
    Summary

    High copper dental amalgams reduce the corrosive gamma 2 phase, improving clinical performance. However, alloy choice, not just copper content, is key to durability and preventing marginal breakdown.

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    Area of Science:

    • Dental Materials Science
    • Metallurgy
    • Clinical Dentistry

    Background:

    • Dental amalgams are widely used restorative materials.
    • High copper amalgams (over 6% copper) were developed to improve properties over traditional low copper amalgams.
    • Understanding the relationship between composition, microstructure, and clinical performance is crucial.

    Purpose of the Study:

    • To review the nature, physical properties, and clinical performance of high copper dental amalgams.
    • To analyze the impact of copper content on amalgam microstructure and its clinical implications.
    • To identify factors influencing the clinical durability of dental amalgams.

    Main Methods:

    • Review of existing literature on high copper dental alloys and their amalgams.
    • Analysis of the microstructural changes associated with high copper content, specifically the reduction of the gamma 2 phase.
    • Correlation of physical properties and microstructural characteristics with clinical performance data.

    Main Results:

    • High copper amalgams reduce or eliminate the soft, corrodible gamma 2 (Sn7Hg) phase by forming the eta (Cu6Sn5) phase.
    • Improved clinical performance, characterized by less marginal breakdown, is linked to low creep, minimal gamma 2 phase, and the presence of zinc.
    • Physical properties alone are not reliable predictors of clinical performance; alloy selection is the most significant factor.

    Conclusions:

    • High copper amalgams generally offer superior clinical performance compared to low copper amalgams.
    • The choice of specific high copper alloy, particularly dispersed phase (silver/copper plus lathe-cut) and certain single composition alloys, significantly impacts clinical durability.
    • While high copper content is beneficial, optimal clinical outcomes depend on careful alloy selection and manipulation.

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