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Journal of Dental Research
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Tarnish Evaluation of Gold-based Dental Alloys

P.P. Corso, Jr

Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, New York 12181

R.M. German

Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, New York 12181

H.D. Simmons, Jr

Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, New York 12181

Three commercial gold dental alloys and three ternary (Au-Ag-Cu) alloys of constant nobility were subjected to a standardized test battery for tarnish. The tests included sodium sulfide and artificial saliva solutions, both at 37°C, in sealed containers. Quantitative measurements of tarnish were made from the alloy color change during a three-day exposure. Alloy nobility is a relatively important factor in determining tarnish resistance; however, microstructure can have a negative effect on tarnish resistance. Alloys with a two-phase microstructure produce microgalvanic conditions which lead to either silver chloride or silver sulfide tarnish products. A solution heat treatment improves tarnish resistance by eliminating microstructural inhomogeneities.

Journal of Dental Research, Vol. 64, No. 5, 848-853 (1985)
DOI: 10.1177/00220345850640051301
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M.M.A. Vrijhoef, P.R. Mezger, J.M. Van der Zel, and E.H. Greener
Corrosion of Ferromagnetic Alloys used for Magnetic Retention of Overdentures
Journal of Dental Research, September 1, 1987; 66(9): 1456 - 1459.
[Abstract] [PDF]