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Journal of Dental Research, Vol 67, 61-65, Copyright © 1988 by International & American Associations for Dental Research Online Journals

ARTICLES

Influence of contraction mismatch and cooling rate on flexural failure of PFM systems

J. P. Coffey, K. J. Anusavice, P. H. DeHoff, R. B. Lee and B. Hojjatie
Department of Prosthodontics, College of Dentistry, University of Florida, Gainesville 32610, USA.

The interactive influence of cooling rate and the sign and magnitude of thermal contraction difference between metals and ceramic veneers on bond strength have not been extensively analyzed, although numerous bond-test studies have been reported during the past two decades. A previous analytical study of residual incompatibility stress in bond-test specimens indicated that bond strength values may be of relatively little value if the residual stress state of the metal-ceramic specimens is not considered. The objective of this study was to determine the influence of cooling rate and contraction mismatch on the flexural failure resistance of metal opaque-porcelain strips. Specimens were subjected to four-point loading in an Instron testing machine until crack initiation occurred at the metal-ceramic interface. The residual stress states in the ceramic region were estimated from finite element stress analyses of the bond-test specimens by use of dilatometry data obtained at the cooling rate of 3 degrees C/min. The total stress induced from the residual stress and the applied flexural load was also determined for these specimens. Statistical analyses of the experimental data revealed that the slowly cooled specimens exhibited a significantly lower (p < 0.05) flexural strength compared with rapidly cooled specimens. Regardless of the cooling technique, metal-ceramic specimens with a negative thermal contraction difference (alpha m - alpha p < 0) failed at significantly lower (p < 0.05) flexural loads than did specimens with a positive thermal contraction difference.


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S. Ban and K.J. Anusavice
Influence of Test Method on Failure Stress of Brittle Dental Materials
Journal of Dental Research, December 1, 1990; 69(12): 1791 - 1799.
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