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

• Verfasst von: Rues, Stefan [VerfasserIn]
• Verfasst von: Kröger, Elke [VerfasserIn]
• Verfasst von: Müller, Denise [VerfasserIn]
• Verfasst von: Schmitter, Marc [VerfasserIn]
• Titel: Effect of firing protocols on cohesive failure of all-ceramic crowns
• Verf.angabe: Stefan Rues, Elke Kröger, Denise Müller, Marc Schmitter
• E-Jahr: 2010
• Jahr: 27 August 2010
• Umfang: 8 S.
• Fussnoten: Gesehen am 22.06.2023
• Titel Quelle: Enthalten in: Journal of dentistry
• Ort Quelle: Amsterdam [u.a.] : Elsevier Science, 1972
• Jahr Quelle: 2010
• Band/Heft Quelle: 38(2010), 12 vom: Dez., Seite 987-994
• ISSN Quelle: 1879-176X
• DOI: doi:10.1016/j.jdent.2010.08.014
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Ageing
• Sach-SW: All-ceramic crowns
• Sach-SW: Cohesive failure
• Sach-SW: Firing protocol
• Sach-SW: In vitro test
• K10plus-PPN: 1850852847

Abstract

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.