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New information on high copper amalgam corrosion.

C W Fairhurst, M Marek, M B Butts

    Journal of Dental Research
    |May 1, 1978
    PubMed
    Summary

    Pure copper-tin (Cu6Sn5) is passive in synthetic saliva, meaning it resists corrosion. Previously observed tin corrosion in copper amalgams likely stems from other phases, not pure Cu6Sn5.

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    Area of Science:

    • Materials Science
    • Electrochemistry
    • Biomaterials Science

    Background:

    • Copper-tin (Cu6Sn5) alloys are used in dental amalgams.
    • Understanding the corrosion behavior of dental materials is crucial for longevity and patient safety.
    • Previous studies reported tin corrosion in high-copper amalgams, but the source was unclear.

    Purpose of the Study:

    • To investigate the anodic polarization and corrosion behavior of pure copper-tin (Cu6Sn5) in a synthetic saliva environment.
    • To clarify the contribution of the Cu6Sn5 phase to the overall corrosion of dental amalgams.

    Main Methods:

    • Anodic polarization scans were performed on pure Cu6Sn5.
    • Electrochemical techniques were employed to assess corrosion resistance.
    • The behavior was studied in a nearly neutral synthetic saliva solution.

    Main Results:

    • Pure Cu6Sn5 exhibited passive behavior in the synthetic saliva.
    • This indicates that Cu6Sn5 itself does not readily corrode under these conditions.
    • The observed passivity suggests Cu6Sn5 is stable in this oral environment.

    Conclusions:

    • The passive nature of pure Cu6Sn5 in synthetic saliva was confirmed.
    • Anodic corrosion previously attributed to high-copper amalgams likely originates from other phases, such as the gamma2 phase or free tin.
    • This finding helps differentiate the corrosion mechanisms of different phases within dental amalgams.

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