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High-temperature Behavior of a Pd-Ag Alloy for Porcelain

J.R. Mackert, Jr

Dental Materials Division, Department of Restorative Dentistry, School of Dentistry, Medical College of Georgia, Augusta, Georgia 30912

R.D. Ringle

Dental Materials Division, Department of Restorative Dentistry, School of Dentistry, Medical College of Georgia, Augusta, Georgia 30912

C.W. Fairhurst

Dental Materials Division, Department of Restorative Dentistry, School of Dentistry, Medical College of Georgia, Augusta, Georgia 30912

The mechanism of formation of nodular material on the surface of a Pd-Ag-based alloy for porcelain during pre-porcelainization heat treatment was investigated using scanning electron microscopy, x-ray diffraction, quantitative metallography, and Auger electron spectroscopy. The nodules were found to form by a Nabarro-Herring creep mechanism driven by the internal oxidation of tin and indium. Implications of this process with regard to porcelain bonding and discoloration are discussed.

Journal of Dental Research, Vol. 62, No. 12, 1229-1235 (1983)
DOI: 10.1177/00220345830620121201
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