A photoelastic assessment of residual stresses in zirconia-veneer crowns

Belli R, Monteiro S, Baratieri LN, Katte H, Petschelt A, Lohbauer U (2012)

Publication Type: Journal article

Publication year: 2012

Journal

Journal of Dental Research SAGE Publications (UK and US)

Book Volume: 91

Pages Range: 316-320

Journal Issue: 3

DOI: 10.1177/0022034511435100

Abstract

Residual stresses within the veneer are linked to the high prevalence of veneer chipping observed in clinical trials of zirconia prostheses. We hypothesized that the thermal mismatch between the zirconia infrastructure and the veneer porcelain, as well as the rate used for cooling zirconia-veneer crowns, would be directly proportional to the magnitude of residual stresses built within the veneer layer. Two porcelains with different coefficients of thermal expansion were used to veneer zirconia copings, to create high or low thermal mismatches. The crowns were cooled according to a fast- or a slow-cooling protocol. The retardation of polarized light waves was used to calculate the residual stress magnitude and distribution across the veneer, according to the photoelasticity principle, in 1.0-mm-thick crown sections. While thermal mismatch was an important factor influencing the maximum stress development in the veneer, cooling rate had a minor role. Curved surfaces were preferential sites for stress concentration regardless of thermal mismatch or cooling rate. © 2012 International & American Associations for Dental Research.

Authors with CRIS profile

Anselm Petschelt Lehrstuhl für Zahn-,Mund- und Kieferheilkunde, insbesondere Zahnerhaltung, Parodontologie und Kinderzahnheilkunde Ulrich Lohbauer Lehrstuhl für Zahn-,Mund- und Kieferheilkunde, insbesondere Zahnerhaltung, Parodontologie und Kinderzahnheilkunde

Involved external institutions

ilis gmbh DE Germany (DE) Federal University of Santa Catarina / Universidade Federal de Santa Catarina (UFSC) BR Brazil (BR)

How to cite

APA:

Belli, R., Monteiro, S., Baratieri, L.N., Katte, H., Petschelt, A., & Lohbauer, U. (2012). A photoelastic assessment of residual stresses in zirconia-veneer crowns. Journal of Dental Research, 91(3), 316-320. https://doi.org/10.1177/0022034511435100

MLA:

Belli, Renan, et al. "A photoelastic assessment of residual stresses in zirconia-veneer crowns." Journal of Dental Research 91.3 (2012): 316-320.

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