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Strength, toughness and aging stability of highly-translucent Y-TZP ceramics for dental restorations
Open accessAbstract
OBJECTIVE The aim was to evaluate the optical properties, mechanical properties and aging stability of yttria-stabilized zirconia with different compositions, highlighting the influence of the alumina addition, Y2O3 content and La2O3 doping on the translucency. METHODS Five different Y-TZP zirconia powders (3 commercially available and 2 experimentally modified) were sintered under the same conditions and characterized by X-ray diffraction with Rietveld analysis and scanning electron microscopy (SEM). Translucency (n=6/group) was measured with a color meter, allowing to calculate the translucency parameter (TP) and the contrast ratio (CR). Mechanical properties were appraised with four-point bending strength (n=10), single edge V-notched beam (SEVNB) fracture toughness (n=8) and Vickers hardness (n=10). The aging stability was evaluated by measuring the tetragonal to monoclinic transformation (n=3) after accelerated hydrothermal aging in steam at 134°C, and the transformation curves were fitted by the Mehl-Avrami-Johnson (MAJ) equation. Data were analyzed by one-way ANOVA, followed by Tukey's HSD test (α=0.05). RESULTS Lowering the alumina content below 0.25wt.% avoided the formation of alumina particles and therefore increased the translucency of 3Y-TZP ceramics, but the hydrothermal aging stability was reduced. A higher yttria content (5mol%) introduced about 50% cubic zirconia phase and gave rise to the most translucent and aging-resistant Y-TZP ceramics, but the fracture toughness and strength were considerably sacrificed. 0.2mol% La2O3 doping of 3Y-TZP tailored the grain boundary chemistry and significantly improved the aging resistance and translucency. Although the translucency improvement by La2O3 doping was less effective than for introducing a substantial amount of cubic zirconia, this strategy was able to maintain the mechanical properties of typical 3Y-TZP ceramics. SIGNIFICANCE Three different approaches were compared to improve the translucency of 3Y-TZP ceramics.
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Cited by
Comparison of the mechanical properties of translucent zirconia and lithium disilicate
Kwon, S. J., Lawson, N. C., McLaren, E. E., Nejat, A. H., & Burgess, J. O. (2018) · The Journal of Prosthetic Dentistry · doi:10.1016/j.prosdent.2017.08.004 · Cited by 299
Revolution of Current Dental Zirconia: A Comprehensive Review
Alqutaibi, A. Y., Ghulam, O., Krsoum, M., Binmahmoud, S., Taher, H., Elmalky, W., & Zafar, M. S. (2022) · Molecules · doi:10.3390/molecules27051699 · Cited by 142
Metadata
- Authors
- Zhang, F., Inokoshi, M., Batuk, M., Hadermann, J., Naert, I., Van Meerbeek, B., & Vleugels, J.
- Venue
- Dental Materials
- Publisher
- Elsevier BV
- Published
- 2016-12
- Volume
- 32
- Issue
- 12
- Pages
- e327-e337
- ISSN
- 0109-5641 (ISSN-L)
- OpenAlex
- W2528183725
- Cited by
- 418
- References
- 0
- FWCI
- 27.10
- Type
- journal article
- Language
- en
- Open access
- green
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- Zhang, F., Inokoshi, M., Batuk, M., Hadermann, J., Naert, I., Van Meerbeek, B., & Vleugels, J. (2016). Strength, toughness and aging stability of highly-translucent Y-TZP ceramics for dental restorations. Dental Materials. https://doi.org/10.1016/j.dental.2016.09.025
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