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Journal of Dental Research
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Interactive Effect of Stress and Temperature on Creep of PFM Alloys

K.J. Anusavice

Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville, Florida 32610

C. Shen

Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville, Florida 32610

D. Hashinger

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

S.W. Twiggs

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

The creep rates of six alloys for porcelain-fused-to-metal (PFM) restorations were determined as a function of flexural stress and temperature. Although two Pd-Cu alloys demonstrated excellent resistance to creep at low-stress, high-temperature conditions, they were especially susceptible to deformation at high stresses and temperatures near the glass transition temperature of dental porcelains. In comparison, a Ni-Cr alloy and a Pd-Co alloy demonstrated superior creep resistance at high-stress, low-temperature conditions. This indicates a relatively low potential for deformation due to stresses which may result from a thermal contraction differential between these two alloys and incompatible dental porcelains.

Journal of Dental Research, Vol. 64, No. 8, 1094-1099 (1985)
DOI: 10.1177/00220345850640081501
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K.J. Anusavice and J.E. Carroll
Effect of Incompatibility Stress on the Fit of Metal-Ceramic Crowns
Journal of Dental Research, August 1, 1987; 66(8): 1341 - 1345.
[Abstract] [PDF]