Distribution analysis and chemical state estimation are important to evaluate the corrosion resistance and biocompatibility of dental alloys. However, the levels of the eroded metallic elements are quite low, and so information on them cannot be obtained with standard analytical methods. In this study, the erosion behavior of four dental alloys implanted in the subcutaneous layer of animal models was investigated using synchrotron radiation X-ray fluorescence spectroscopy and X-ray absorption fine structure analysis. As the results, clear localizations of Ag and Sn were observed in the tissue surrounding Ag-Sn-Zn alloy. Also, slight localizations of the alloy elements of Ag-Pd-Au and Co-Cr alloys were observed. Those localized elements could be estimated as aqueous ions (Co), sulfide (Ag), and oxide (Cr), which were suggested as the origins of alloy erosion.

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