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Materials 2016, 9(5), 339; doi:10.3390/ma9050339

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
Received: 16 February 2016 / Revised: 25 April 2016 / Accepted: 29 April 2016 / Published: 5 May 2016
(This article belongs to the Section Biomaterials)
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Abstract

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
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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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