Surface of precious dental alloys in artificial saliva observed by in situ specular reflection spectroscopy.

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  • OHE Keiji
    Tokyo University of Pharmacy and Life Science,1432-1,Horinouchi,Hachioji-shi,Tokyo 192-0392
  • KUSU Fumiyo
    Tokyo University of Pharmacy and Life Science,1432-1,Horinouchi,Hachioji-shi,Tokyo 192-0392

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Other Title
  • 人工唾液に接する歯科用貴金属合金の光反射測定法によるｉｎ　ｓｉｔｕ観測
  • ジンコウ ダエキ ニ セッスル シカヨウ キキンゾク ゴウキン ノ ヒカリ ハンシャ ソクテイホウ ニ ヨル in situ カンソク

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Description

In artificial saliva, the surface corrosion of precious dental alloys containing Au, Ag and Cu was studied by in situ specular reflection spectroscopy.The rest potentials of the alloys in contact with artificial saliva were about −0.1V∼0.1V vs.SCE.It was found from the cyclic voltammograms of the alloys, that AgCl and/or CuCl were formed on the alloy at more positive potential than 0.1V.The formation of AgCl and/or CuCl was also observed as a reflectivity-potential change using specular reflection spectroscopy.For an alloy containing a large amount of Au, Cl ion was adsorbed on the alloy surface.Since the formation of AgCl and/or CuCl and the adsorption of Cl ion occurred at a more positive potential than the rest potential of alloy.It seemed that these alloys were stable in the artificial saliva.To confirm the surface corrosion of the dental alloys, this in situ analytical method is thus sufficiently sensitive and useful.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 49 (7), 503-508, 2000

    The Japan Society for Analytical Chemistry

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