Journal of Dental Research, Vol 62, 585-589, Copyright © 1983 by International & American Associations for Dental Research Online Journals
Effects of porcelain/alloy interfacial diffusion zones on thermo-mechanical strain
J. A. Tesk, R. W. Hinman, G. E. Widera, A. D. Holmes and J. M. Cassel
Chemical bonding between dental porcelains and alloys results from
interdiffusion of porcelain and metal ions. An interfacial diffusion zone
is created which, most likely, has properties different from those of bulk
materials. The changed interface might affect experimental measurements of
thermo-mechanical strain. To determine the magnitude and conditions under
which this would occur, the interface was modeled as the intermediate layer
of a three-layered porcelain-veneered split-metal ring. Layer thicknesses
and coefficients of thermal expansion were varied, and the effects on gap
change after cooling through 500 degrees C were calculated. Results are
presented in a series of 14 Figs., ten curves each, which depict not only
interfacial effects, but are extended for use in interpretation of the
effects of properties of opaques and glazes as well. Under most conditions,
the interface will not affect experimental measurements; some special
exceptions are noted.
