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Journal of Dental Research, Vol 64, 476-480, Copyright © 1985 by International & American Associations for Dental Research Online Journals

ARTICLES

Thermal stress failure of porcelain bonded to a palladium-silver alloy

T. R. Walton and W. J. O'Brien

Cracking or rupturing, due to thermal stress, of porcelain bonded to a palladium-silver alloy indicated that porcelain-metal thermal compatibility was dependent on: the difference in thermal expansion coefficients of the porcelain and metal; the geometry and dimensions of the samples; and the porcelain-metal thickness ratio. A spherical configuration was more sensitive to thermal expansion coefficient differences than was a disc configuration. A higher incidence of cracking resulted from an increase in both specimen size and porcelain-metal thickness ratio.




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