Corrosion resistance evaluation of Pd-free Ag-Au-Pt-Cu dental alloys

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  • FUJITA Takeshi
    Department of Dental and Biomedical Materials Science, Unit of Basic Medical Science, Graduate School of Biomedical Sciences, Nagasaki University
  • SHIRAISHI Takanobu
    Department of Dental and Biomedical Materials Science, Unit of Basic Medical Science, Graduate School of Biomedical Sciences, Nagasaki University
  • TAKUMA Yasuko
    Department of Dental and Biomedical Materials Science, Unit of Basic Medical Science, Graduate School of Biomedical Sciences, Nagasaki University
  • HISATSUNE Kunihiro
    Department of Dental and Biomedical Materials Science, Unit of Basic Medical Science, Graduate School of Biomedical Sciences, Nagasaki University

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Description

The corrosion resistance of nine experimental Pd-free Ag-Au-Pt-Cu dental alloys in a 0.9% NaCl solution was investigated using cyclic voltammetry (CV), optical microscopy, and scanning electron microscopy (SEM). CV measurements revealed that the breakdown potential (Ebd) and zero current potential (Ezc) increased with increasing Au/(Au+Ag) atomic ratio. Thus, the Au/(Au+Ag) atomic ratio, but not the Cu content, influenced the corrosion resistance of Ag-Au-Pt-Cu alloys. After the forward scan of CV, both optical and scanning electron microscope images showed that in all the experimental alloys, the matrix phase was corroded but not the second phase. From corrosion resistance viewpoint, the Ag-Au-Pt-Cu alloys seemed to be suitable for clinical application.

Journal

  • Dental Materials Journal

    Dental Materials Journal 30 (2), 136-142, 2011

    The Japanese Society for Dental Materials and Devices

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