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Influence of Different Framework Designs on the Fracture Properties of Ceria-Stabilized Tetragonal Zirconia/Alumina-Based All-Ceramic Crowns

Section Medical Materials Science & Technology, University Hospital Tübingen, Osianderstrasse 2-8, Tübingen 72076, Germany
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Academic Editor: Nadia Jessel
Materials 2016, 9(5), 339; https://doi.org/10.3390/ma9050339
Received: 16 February 2016 / Revised: 25 April 2016 / Accepted: 29 April 2016 / Published: 5 May 2016
(This article belongs to the Section Biomaterials)
The aim of this study was to evaluate the fracture load and failure mode of all-ceramic crowns with different ceria-stabilized tetragonal zirconia/alumina nanocomposite (Ce-TZP/A) framework designs. Four frameworks (anatomical shape: AS, with a buccal or lingual supporting structure: BS and LS, or buccal and lingual supporting structures: BLS) were fabricated. All frameworks were veneered with porcelain to fabricate all-ceramic crowns followed by cementation to tooth analogs. The fracture load of each crown either without or with pre-loading (1.2 million cycles, 49 N) was measured. The failure mode was classified into partial or complete fracture. Differences were tested for significance (p < 0.05) by a two-way Analysis of Variance (ANOVA), followed by Tukey’s test and by Fisher’s exact test, respectively. Without pre-loading, supporting structures did not influence the fracture load or failure mode. Partial fractures were the most common failure mode. Pre-loading promoted the severity of the failure mode, although the fracture load among the framework designs was not influenced. In the AS group, prefailures were observed during pre-loading, and complete fractures were significantly increased after pre-loading. In contrast, the failure mode of the BLS group remained unchanged, showing only partial fracture even after pre-loading. This Ce-TZP/A framework design, comprised of an anatomical shape with additional buccal and lingual structures, has the potential to reduce the chipping of the veneering porcelain. View Full-Text
Keywords: ceria-stabilized tetragonal zirconia/alumina; framework modification; all-ceramic restoration; zirconia; chipping; porcelain veneer ceria-stabilized tetragonal zirconia/alumina; framework modification; all-ceramic restoration; zirconia; chipping; porcelain veneer
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Sawada, T.; Spintzyk, S.; Schille, C.; Schweizer, E.; Scheideler, L.; Geis-Gerstorfer, J. Influence of Different Framework Designs on the Fracture Properties of Ceria-Stabilized Tetragonal Zirconia/Alumina-Based All-Ceramic Crowns. Materials 2016, 9, 339.

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