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Corrosion Evaluation of Gold-based Dental Alloys

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-based dental alloys and three constant-nobility ternary alloys (Au-Ag-Cu) were evaluated for corrosion using a quantitative test battery. Integration of the current density, in a de-aerated solution of 1% NaCl along the approximate potential range found in the mouth (-300 m V to +300 m V vs. SCE), yields a quantitative rank ordering of the test alloys. The results are combined with prior findings on other commercial alloys to demonstrate the interaction of nobility and microstructure. Nobility determines the overall corrosion resistance for gold-based alloys. However, because of mutual insolubility, alloying with copper induces silver segregation, resulting in a higher corrosion rate at a given nobility. Thus, microstructure has an influence on corrosion, but heat treatments are largely ineffective in altering the basic corrosion characteristics. The test techniques, in combination with tarnish evaluations, provide a quantitative battery for alloy evaluation. The results indicate the combinations of nobility, microstructure, and environment most likely to avoid corrosion difficulties.

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Journal of Dental Research, Vol. 64, No. 5, 854-859 (1985)
DOI: 10.1177/00220345850640051401


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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Corso, P.P. Articles by Simmons, H.D. Search for Related Content PubMed PubMed Citation Articles by Corso, P.P., Jr Articles by Simmons, H.D., Jr Pubmed/NCBI databases Compound via MeSH Substance via MeSH Hazardous Substances DB SODIUM CHLORIDE Social Bookmarking                         What's this?