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Development of a hoop-strength test for model sphero-cylindrical dental ceramic crowns : FEA and fractography

Title data

Belli, Renan ; Völkl, Harald ; Csato, Stefan ; Tremmel, Stephan ; Wartzack, Sandro ; Lohbauer, Ulrich:
Development of a hoop-strength test for model sphero-cylindrical dental ceramic crowns : FEA and fractography.
In: Journal of the European Ceramic Society. Vol. 40 (November 2020) Issue 14 . - pp. 4753-4764.
ISSN 0955-2219
DOI: https://doi.org/10.1016/j.jeurceramsoc.2020.01.064

Abstract in another language

Here we describe the development of a mechanical test that simulates a circumferential “hoop-stress” at the margins of model dental ceramic crowns. A simplified sphero-cylindrical geometry was modelled in two thicknesses and machined out of two glass-ceramic materials. The specimens were loaded by a conical metallic piston to induce circumferential hoop-stresses at the margins until fracture. Broken specimens were fractographically analyzed to determine the location of the fracture origin and to measure the dimensions of the critical defect, allowing the calculation of the stress at failure from fracture mechanics relations. For thick specimens, machining defects at the outer margins barely played a role in fracture initiation. For thin specimens, outer defects started to dominate the failure mode. CAD/CAM machining showed to predispose thinner margins to early fracture. Crowns should be designed with increased thickness in order to minimize the effect of marginal damage in the circumferential stress field inducing fracture.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Fractography; Finite Element Analysis; Dental Mechanical Test; Glass-Ceramic
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Engineering Design and CAD
Faculties > Faculty of Engineering Science > Chair Engineering Design and CAD > Chair Engineering Design and CAD - Univ.-Prof. Dr.-Ing. Frank Rieg
Profile Fields > Advanced Fields > Advanced Materials
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Result of work at the UBT: No
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 14 Sep 2020 10:09
Last Modified: 14 Sep 2020 10:09
URI: https://eref.uni-bayreuth.de/id/eprint/56952