アブストラクト（26巻2号：The Bulletin of Kanagawa Dental College）

The Bulletin of Kanagawa Dental College

English

Title　： Corrosion and Tarnish of Dental Ag-based Alloys
Subtitle　： BKDC CLINICAL AND RESEARCH TOPICS : Bioadaptives of Dental Materials
Authors　： Kazuhiko Endo, Masahiro Suzuki, Hiroki Ohno, Koichi Matsuda1)
Authors（kana）　：
Organization　： Department of Dental Materials Science, School of Dentistry, Health Sciences University of Hokkaido, 1)Department of Operative Dentistry, School of Dentistry, Health Sciences University of Hokkaido
Journal　： The Bulletin of Kanagawa Dental College
Volume　： 26
Number　： 2
Page　： 114-120
Year/Month　： 1998 / 9
Article　： Report
Publisher　： Kanagawa Odontological Society
Abstract　： [Abstract] This paper reviews the corrosion characteristics of two types of Ag-based alloy, Ag-Pd-Cu-Au and Ag-In-Zn alloys. The corrosion products on Ag-based alloy restorations analyzed by X-ray photoelectron spectroscopy (XPS) are summarized and the factors affecting the in vivo corrosion behavior of these alloys are discussed. The corrosion of Ag-Pd-Cu-Au alloy proceeds in the oral cavity through the formation of metal sulfides in the presence of hydrogen sulfide ions (HS-), and an increase of Pd content is effective in improving the corrosion resistance. In contrast, the corrosion of Ag-In-Zn alloy in the oral cavity takes place through the formation of oxides of non-precious metals, such as In and Zn. Chloride ions (Cl-) contained in saliva significantly enhance the corrosion reaction to form In and Zn oxides on the alloy surface. Corrosion resistance and corrosion reactions of Ag-based alloys in the oral environment are very different depending on the chemical composition.
Practice　： Dentistry
Keywords　： Ag-based alloy, Corrosion, Tarnish, X-ray potoelectron spectroscopy