Fracture resistance of three different all-ceramic crowns: In vitro study

Alarwali, Ammar M. and Kutty, Muralithran Govindan and Al-Haddad, Afaf Y. and Gonzalez, Maria Angela G. (2018) Fracture resistance of three different all-ceramic crowns: In vitro study. American Journal of Dentistry, 31 (1). pp. 39-44. ISSN 0894-8275,

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Purpose: To evaluate the fracture resistance and failure mode of three different all-ceramic crowns; CEREC Bloc, IPS e.Max Press and Cercon in a simulated clinical situation. Methods: 30 extracted maxillary premolars were prepared and randomly assigned to three groups equally according to the type of crown used. The first was the CEREC group: monolithic feldspathic crowns (CEREC Blocs). The second was the E.Max group: monolithic lithium disilicate crowns (IPS e.Max Press). The third group was the Cercon group: bilayered partially stabilized zirconia crowns (Cercon). All crowns were cemented using dual-cured resin cement (ParaCore). The specimens were then subjected to thermocycling (5-55°C/500 cycles) and loaded to failure at an angle of 45° to the occlusal surface of the crown. Failure data was statistically analyzed using one-way ANOVA and Tukey's HSD post hoc test at a= 0.05. Fractographic analysis was performed to determine the fracture modes of the failed specimens. Results: The mean fracture values for CEREC, E.Max and Cercon groups were 387 ± 60 N, 452 ± 86 N, and 540 ± 171 N, respectively. Significant differences were found between CEREC and Cercon groups (P< 0.05). Catastrophic fracture within the ceramic crown was the major failure mode of the CEREC group. For E.Max and Cercon groups, the major failure mode was exhibiting severe tooth fracture while the ceramic crown remained intact.

Item Type: Article
Uncontrolled Keywords: Crowns; Dental Porcelain; Dental Restoration Failure; Dental Stress Analysis; Materials Testing; Random Allocation; Tooth Fractures
Subjects: R Medicine > RK Dentistry
Divisions: Faculty of Dentistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 26 Sep 2019 07:39
Last Modified: 26 Sep 2019 07:39

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