Effect of firing protocols on cohesive failure of all-ceramic crowns
Objectives - The mechanical properties of veneering material in all-ceramic restorations are inferior to those of high-strength ceramics. The objective of this study was to assess the effect of three different firing protocols (different cooling times) on cohesive failure of veneered all-ceramic cro...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
27 August 2010
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| In: |
Journal of dentistry
Year: 2010, Volume: 38, Issue: 12, Pages: 987-994 |
| ISSN: | 1879-176X |
| DOI: | 10.1016/j.jdent.2010.08.014 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.jdent.2010.08.014 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0300571210002162 
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| Author Notes: | Stefan Rues, Elke Kröger, Denise Müller, Marc Schmitter |
| Summary: | Objectives - The mechanical properties of veneering material in all-ceramic restorations are inferior to those of high-strength ceramics. The objective of this study was to assess the effect of three different firing protocols (different cooling times) on cohesive failure of veneered all-ceramic crowns using a newly developed in vitro test design. - Methods - A prepared anterior maxillary incisor was used to produce geometrically identical crowns (n=68) with a zirconia framework 0.4mm thick veneered with two different ceramics and prepared by use of three different firing protocols. Twenty crowns were loaded until fracture without artificial ageing; the other crowns underwent thermocycling and chewing simulation before ultimate-load testing. Statistical analysis was performed using non-parametric tests. - Results - The results showed that a reduced temperature decrease after firing led to better performance of all-ceramic anterior crowns in the in vitro tests. A significant difference with regard to firing protocol (p=0.006) was observed for one veneering ceramic material only, however. - Conclusion - It can therefore be concluded that the test design presented enabled sensitive measurement of the effect of firing protocol on cohesive failure of all-ceramic crowns. The modified firing protocol with 6min additional cooling time resulted in greater resistance. |
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| Item Description: | Gesehen am 22.06.2023 |
| Physical Description: | Online Resource |
| ISSN: | 1879-176X |
| DOI: | 10.1016/j.jdent.2010.08.014 |