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Journal of Dental Research, Vol 64, 1094-1099, Copyright © 1985 by International & American Associations for Dental Research Online Journals

ARTICLES

Interactive effect of stress and temperature on creep of PFM alloys

K. J. Anusavice, C. Shen, D. Hashinger and S. W. Twiggs

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.




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