Chemical state analysis of rarely contained biological metallic element using X-ray absorption fine structure (XAFS) analysis

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In this study, the chemical state of metallic elements and micro foreign bodies contained in the biological tissues were analyzed using XAFS method and the behavior of dental and medical alloys (e.g.titanium, nickel-titanium alloy, chromium-based alloy) was evaluated. Titanium in the surrounding tissues of dental and medical implants was usually existed as the metallic Ti, but, the titanium oxide was also detected. The titanium oxide was considered as derived from the dissolved and precipitated Ti. Nickel was existed as the ionic state in the surroundings of nickel-based alloy, then, the toxic effect of Ni ion to the surrounding tissues was concerned. In addition, trace element in the tussues (e.g.Se) analysis and micro XAFS analysis were also carried. In conclusion, the possibility of XAFS analysis for the biological tissue was suggested.