at Google ScholarTitle 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
(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 > Former Professors > 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 Faculties Faculties > Faculty of Engineering Science Profile Fields Profile Fields > Advanced Fields Profile Fields > Emerging Fields Faculties > Faculty of Engineering Science > Former Professors |
| 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: | 26 Jul 2022 10:24 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/56952 |