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Effect of firing protocols on cohesive failure of all-ceramic crowns

Objectives - The mechanical properties of veneering material in all-ceramic restorations are inferior to those of high-strength ceramics. The objective of this study was to assess the effect of three different firing protocols (different cooling times) on cohesive failure of veneered all-ceramic cro...

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Hauptverfasser: Rues, Stefan (VerfasserIn) , Kröger, Elke (VerfasserIn) , Müller, Denise (VerfasserIn) , Schmitter, Marc (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 27 August 2010
In: Journal of dentistry
Year: 2010, Jahrgang: 38, Heft: 12, Pages: 987-994
ISSN:1879-176X
DOI:10.1016/j.jdent.2010.08.014
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.jdent.2010.08.014
Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0300571210002162
Volltext
Verfasserangaben:Stefan Rues, Elke Kröger, Denise Müller, Marc Schmitter

MARC

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520 |a Objectives - The mechanical properties of veneering material in all-ceramic restorations are inferior to those of high-strength ceramics. The objective of this study was to assess the effect of three different firing protocols (different cooling times) on cohesive failure of veneered all-ceramic crowns using a newly developed in vitro test design. - Methods - A prepared anterior maxillary incisor was used to produce geometrically identical crowns (n=68) with a zirconia framework 0.4mm thick veneered with two different ceramics and prepared by use of three different firing protocols. Twenty crowns were loaded until fracture without artificial ageing; the other crowns underwent thermocycling and chewing simulation before ultimate-load testing. Statistical analysis was performed using non-parametric tests. - Results - The results showed that a reduced temperature decrease after firing led to better performance of all-ceramic anterior crowns in the in vitro tests. A significant difference with regard to firing protocol (p=0.006) was observed for one veneering ceramic material only, however. - Conclusion - It can therefore be concluded that the test design presented enabled sensitive measurement of the effect of firing protocol on cohesive failure of all-ceramic crowns. The modified firing protocol with 6min additional cooling time resulted in greater resistance. 
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