The effects of heating rate and sintering time on the biaxial flexural strength of monolithic zirconia ceramics
- 27 February 2023
- journal article
- research article
- Published by Walter de Gruyter GmbH in Biomedizinische Technik/Biomedical Engineering
- Vol. 68 (4), 437-443
- https://doi.org/10.1515/bmt-2022-0338
Abstract
The strength of zirconia ceramic materials used in restorations is dependent upon sintering. Varying sintering protocols may affect the biaxial flexural strength of zirconia materials. This in vitro study was conducted to investigate the effects of sintering parameters on the biaxial flexural strength of monolithic zirconia. Two different monoblock zirconia ceramics were used. Following coloration, samples of both types of ceramics were divided into groups according to whether or not biaxial flexural strength testing was performed directly after sintering or following thermocycling. Biaxial flexural strength data was analysed with a Shapiro Wilk normality test, followed by 1-way ANOVA, Tukey post hoc tests for inter-group comparisons, and paired samples t-tests for intra-group comparisons. A significant difference was found between the biaxial flexural strengths of Zircon X and Upcera ceramics before thermocycling (p<0.05). In both Zircon X and Upcera ceramic groups, the thermocycling process created a significant difference in the biaxial flexural strength values of the ceramic samples in Group 6 (p<0.05) which had the slowest heating rate and longest holding time. The zirconia ceramics have higher BFS at higher heating rates either before or after thermocycling. The holding time has significant effects on thermocycling and flexural strength. The zirconia achieved its optimum strength when it sintered at longer time regardless of heating rates.Keywords
This publication has 37 references indexed in Scilit:
- Surface structure and mechanical properties of impaction-modified Y-TZPDental Materials, 2014
- Influence of sintering conditions on low-temperature degradation of dental zirconiaDental Materials, 2014
- Effects of the sintering conditions of dental zirconia ceramics on the grain size and translucencyThe Journal of Advanced Prosthodontics, 2013
- Effects of sintering temperature and particle size on the translucency of zirconium dioxide dental ceramicJournal of Materials Science: Materials in Medicine, 2011
- Effect of sintering time on biaxial strength of zirconium dioxideDental Materials, 2009
- Effect of coloring with various metal oxides on the microstructure, color, and flexural strength of 3Y‐TZPJournal of Biomedical Materials Research Part B: Applied Biomaterials, 2008
- Effect of shading the zirconia framework on biaxial strength and surface microhardnessActa Odontologica Scandinavica, 2008
- What future for zirconia as a biomaterial?Biomaterials, 2006
- Influence of surface and heat treatments on the flexural strength of Y-TZP dental ceramicJournal of Dentistry, 2005
- A quantitative assessment of cavities in 3 mol% yttria-stabilized tetragonal zirconia specimens containing various grain sizeCeramics International, 2002