Sorrentino, R, Triulzio, C, Tricarico, MG et al. (3 more authors) (2016) In vitro analysis of the fracture resistance of CAD-CAM monolithic zirconia molar crowns with different occlusal thickness. Journal of the Mechanical Behavior of Biomedical Materials, 61. pp. 328-333. ISSN 1751-6161
Abstract
Objectives: To compare the fracture resistance and mode of failure of CAD-CAM monolithic zirconia crowns with different occlusal thickness. Material and methods: Forty CAD-CAM monolithic zirconia crowns with different occlusal thickness were randomly distributed into 4 experimental groups: 2.0 mm (group 1), 1.5 mm (group 2), 1.0 mm (group 3) and 0.5 mm (group 4). The restorations were cemented onto human molars with a self-adhesive resin cement. The specimens were loaded until fracture; the fracture resistance and mode of failure were recorded. The data were statistically analyzed with the one-way ANOVA followed by the Fisher's Exact test with Bonferroni's correction (p=0.05). Results: The fracture resistance values of all the specimens exceeded the maximum physiological occlusal loads in molar regions. All the crowns showed cohesive microcracks of the zirconia core; only 1 crown with a thickness of 0.5 mm was interested by a complete fracture. Conclusions: The occlusal thickness of CAD-CAM monolithic zirconia crowns did not influence either the fracture resistance and the mode of failure of the restorations; the occlusal thickness of CAD-CAM monolithic zirconia crowns can be reduced up to a lower bound of 0.5 mm keeping a sufficient strength to withstand occlusal loads; CAD-CAM monolithic zirconia crowns showed sufficient fracture resistance to be used in molar regions, even in a thin configuration (0.5 mm).
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016, Elsevier Ltd. This is an author produced version of a paper published in Journal of the Mechanical Behavior of Biomedical Materials. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Zirconia; Monolithic; Crown; CAD–CAM; Fracture resistance; Occlusal thickness |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Medicine and Health (Leeds) > School of Dentistry (Leeds) > Restorative Dentistry (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 27 May 2016 11:41 |
Last Modified: | 14 Apr 2017 02:33 |
Published Version: | http://dx.doi.org/10.1016/j.jmbbm.2016.04.014 |
Status: | Published |
Identification Number: | 10.1016/j.jmbbm.2016.04.014 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:100216 |