Chipping behaviour of all-ceramic crowns with zirconia framework and CAD/CAM manufactured veneer

• Verfasst von: Schmitter, Marc [VerfasserIn]
• Verfasst von: Müller, Denise [VerfasserIn]
• Verfasst von: Rues, Stefan [VerfasserIn]
• Titel: Chipping behaviour of all-ceramic crowns with zirconia framework and CAD/CAM manufactured veneer
• Verf.angabe: M. Schmitter, D. Mueller, S. Rues
• Jahr des Originals: 2011
• Umfang: 9 S.
• Fussnoten: Available online 14 December 2011 ; Gesehen am 13.06.2018
• Titel Quelle: Enthalten in: Journal of dentistry
• Jahr Quelle: 2012
• Band/Heft Quelle: 40(2012), 2, S. 154-162
• ISSN Quelle: 1879-176X
• DOI: doi:10.1016/j.jdent.2011.12.007
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1576310701

Abstract

Objectives: The aim of this in vitro study was to assess the ultimate load to failure of zirconia based crowns veneered with CAD/CAM manufactured ceramic. Methods: 32 identical, anatoform zirconia (Sirona inCoris ZI, mono L F1) frameworks (thickness 0.6mm) were constructed (Sirona inLab 3.80). Afterwards, 16 crowns were completed using a CAD/CAM manufactured lithium disilicate ceramic veneer (IPS e.max CAD, Ivoclar Vivadent). The remaining 16 frames were veneered using conventional manual layering technique. For the CAD/CAM manufactured veneers, the connection between framework and veneer was accomplished via a glass fusion ceramics. Before fracture tests, half of the specimens underwent thermocycling and chewing simulation (1.2 million chewing cycles, force magnitude Fmax=108N). To further investigate the new technique, finite element computations were carried out on the basis of the original geometry. Results: Nearly all (87.5%) conventionally veneered crowns failed alreadyduring chewing simulation, whereas crowns with CAD/CAM manufactured veneers were non-sensitive to artificial ageing. Crowns veneered with lithium disilicate ceramic displayed ultimate loads to failure of about 1600N. Conclusion: The CAD/CAM production of veneers for restorations with zirconia framework is a promising way to reduce failures originating from material fatigue.