STP684

    Application of Electrochemical Techniques to Characterize the Corrosion of Dental Alloys

    Published: Oct 1979


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    Abstract

    Electrochemical techniques involving potentiostatic and potentiodynamic (hysteresis) polarization have been employed to evaluate the corrosion resistance of dental amalgams and dental casting alloys in a 1.0 percent sodium chloride solution, Unlike conventional dental amalgams, where corrosion is associated mainly with the presence of the tin-mercury (γ2) phase, the corrosion of γ2-free dental amalgams results from the presence of silver-copper eutectic or copper-tin or both. The corrosion of silver-base and gold-base dental casting alloys stems from the presence of silver-rich microsegregations with a possible minor contribution from a copper-rich phase. These results agree with the results obtained from long-term laboratory and clinical studies and thus demonstrate the usefulness of relatively quick, convenient electrochemical techniques in the evaluation of the corrosion resistance of dental alloys.

    Keywords:

    implant materials, potentiostatic, potentiodynamic, hysteresis, polarization, evaluation, corrosion resistance, dental amalgams, casting alloys, silver-base, gold-base


    Author Information:

    Sarkar, NK
    Assistant professor, School of Dentistry, Louisiana State University, New Orleans, La

    Fuys, RA
    Director and secretary, American Dental Association, Chicago, Ill

    Stanford, JW
    Director and secretary, American Dental Association, Chicago, Ill


    Paper ID: STP35950S

    Committee/Subcommittee: F04.19

    DOI: 10.1520/STP35950S


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