Surface analysis of dental amalgams by X-ray photoelectron spectroscopy and X-ray diffraction
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概要
- 論文の詳細を見る
Objectives: It is important to characterize the surface of dental amalgam in order to understand the process of mercury release from amalgam restorations in the oral cavity. The mercury evaporation occurs not only from the newly made restoration but also from the set material. Methods: The surfaces of four different types of amalgams, which had been well set, were analyzed with X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) and the relationship between surface compositions and mercury release was studied. Fresh amalgam surfaces as well as aged surfaces, which were stored for 30 days in air, were investigated using XPS and the chemical states of amalgam components and oxygen were studied. The aged surfaces were also characterized with XRD and grazing angle XRD. Results: With increased oxidation, the surface contents of tin and oxygen were increased in all amalgams. In contrast, the surface contents of copper and mercury were decreased. An increase of zinc or indium content were observed in zinc or indium containing amalgams, respectively. A surface layer enriched with indium and oxygen was clearly detected by XPS but not with grazing angle XRD. Significance: The thickness of the enriched surface layer is estimated to be in the order of few nanometer, which is approximately equal to the analysis depth of XPS. In addition, the presence of metallic elements, like tin and zinc, that readily form a stable oxide layer at the surface suppress the release of mercury.
- Elsevier Scienceの論文
著者
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Watari Fumio
Dep. Of Biomedical Dental Materials And Engineering Graduate School Of Dental Medicine Hokkaido Univ
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Watari Fumio
Hokkaido Univ. Sapporo Jpn
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Watari Fumio
Department Of Biomedical Materials And Engineering Graduate School Of Dentistry Hokkaido University
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Uo M
Hokkaido Univ. Sapporo Jpn
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Uo Motohiro
Department Of Biomedical Materials And Engineering Graduate School Of Dentistry Hokkaido University
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Bergman Maud
Department Of Dental Materials Science Faculty Of Medicine Umea University
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Uo Motohiro
Dep. Of Biomedical Materials And Engineering Graduate School Of Dental Medicine Hokkaido Univ.
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Watari Fumio
Dep. Of Biomedical Materials And Engineering Graduate School Of Dental Medicine Hokkaido Univ.
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