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Journal of Dental Research
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Crevice Corrosion Products of Dental Amalgam

E.J. Sutow

Division of Dental Biomaterials Science, Faculty of Dentistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5

D.W. Jones

Division of Dental Biomaterials Science, Faculty of Dentistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5

G.C. Hall

Division of Dental Biomaterials Science, Faculty of Dentistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5

C.G. Owen

Division of Dental Biomaterials Science, Faculty of Dentistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5

The objective of this study was to determine the in vitro corrosion products that resulted from crevice corrosion of low-and high-copper dental amalgams. Specimens were potentiostatically polarized in a chloride-containing electrolyte while set against a PTFE surface to form a crevice. After 16 h, corrosion products were examined by light microscopy, SEM, EDS, and XRD. Analysis showed the presence of three previously reported products [Sn4(OH)6Cl2, SnO, and Cu2O] and a new product, CuCl, which formed on high-copper, {gamma}2-free amalgams. Thermodynamic considerations show that CuCI is stable for the reported in vivo potentials of amalgam restorations and the high acidity and high chloride ion concentration associated with crevice corrosion.

Journal of Dental Research, Vol. 70, No. 7, 1082-1087 (1991)
DOI: 10.1177/00220345910700071301
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