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Delayed Crack Development in Porcelain Due to Incompatibility Stress

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

P.H. Dehoff

Department of Mechanical Engineering and Engineering Science, University of North Carolina at Charlotte, Charlotte, North Carolina 28223

A. Gray

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

R.B. Lee

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

Delayed failure of metal-ceramic restorations due to static fatigue can occur when residual tensile stress is present in porcelain, even in the absence of intra-oral forces. Fixed-partial-denture (FPD) specimens and semicircular arch specimens with gapped cross-arch segments were employed to characterize the potential of two incompatible metal-ceramic systems for producing delayed crack development and to determine the relative sensitivity of these test designs as monitors of incompatibility stresses which resulted from thermal contraction differences between a nickel-chromium alloy and three experimental porcelains.

The arch specimens were judged to be more suitable for analysis of residual stresses because of the larger magnitude of gap changes at each procedural change. However, the FPD specimens exhibited earlier evidence of delayed crack growth in porcelain when the thermal contraction coefficient of the metal exceeded that of the porcelain by either 1.7 x 10^-6/°C or 2.2 x 10^-6/°C. For these two states of incompatibility, the agreement between experimental gap values for the arch specimens and the gap values predicted from composite strip equations was excellent.

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Journal of Dental Research, Vol. 67, No. 8, 1086-1091 (1988)
DOI: 10.1177/00220345880670080501


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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Anusavice, K.J. Articles by Lee, R.B. Search for Related Content PubMed PubMed Citation Articles by Anusavice, K.J. Articles by Lee, R.B. Pubmed/NCBI databases Substance via MeSH Medline Plus Health Information Dentures Social Bookmarking                         What's this?