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Surface analysis of dental amalgams by X-ray photoelectron spectroscopy and X-ray diffraction

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Title: Surface analysis of dental amalgams by X-ray photoelectron spectroscopy and X-ray diffraction
Authors: Uo, Motohiro Browse this author →KAKEN DB
Berglund, Anders Browse this author
Cardenas, Juan Browse this author
Pohl, Lars Browse this author
Watari, Fumio Browse this author →KAKEN DB
Bergman, Maud Browse this author
Sjöberg, Staffan Browse this author
Keywords: Amalgam
Surface analysis
X-ray photoelectron spectroscopy
X-ray diffraction
Issue Date: Nov-2003
Publisher: Elsevier Science
Journal Title: Dental Materials
Volume: 19
Issue: 7
Start Page: 639
End Page: 644
Publisher DOI: 10.1016/S0109-5641(03)00007-1
PMID: 12901989
Abstract: 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.
Type: article (author version)
Appears in Collections:歯学院・歯学研究院 (Graduate School of Dental Medicine / Faculty of Dental Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 宇尾 基弘

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