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Finishing technique effect on strength of zirconia-reinforced lithium silicate ceramic.
- Source :
-
European journal of oral sciences [Eur J Oral Sci] 2024 Feb; Vol. 132 (1), pp. e12964. Date of Electronic Publication: 2023 Dec 07. - Publication Year :
- 2024
-
Abstract
- The aim of this study was to evaluate the effect of two finishing techniques, glazing or polishing, in comparison with the as-cut condition, on the biaxial-flexural-strength (BFS) of a zirconia-reinforced lithium silicate ceramic (ZLS). Cylinders were milled from CAD/CAM blocks and sliced to obtain disc-shaped specimens (ISO6872:2015). Polished and glazed specimens were processed following the manufacturer's instructions. Thirty-three specimens were obtained for each condition and microstructural and BFS/fractographic characterizations were performed. BFS and roughness data were analyzed using Weibull statistics and ANOVA one-way with Tukey post-hoc test, respectively. While a rougher surface was observed for as-cut specimens, smoother surfaces were observed for polished and glazed ZLS at microscopical evaluation and confirmed through surface-roughness evaluation. X-ray spectra depicted a glass phase for all groups and characteristic metasilicate, lithium disilicate, and lithium phosphate peaks for the as-cut and polished specimens. Glazed specimens showed higher characteristic strength than polished and as-cut specimens, which did not differ significantly. While higher Weibull-modulus was observed for the polished than for the as-cut specimens, no statistically significant differences were noted between glazed and polished, and between glazed and as-cut specimens. ZLS presents higher strength when glazed, and polishing increases the structural reliability of the material relative to the as-cut condition. Both finishing techniques reduced surface roughness similarly.<br /> (© 2023 Scandinavian Division of the International Association for Dental Research. Published by John Wiley & Sons Ltd.)
Details
- Language :
- English
- ISSN :
- 1600-0722
- Volume :
- 132
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- European journal of oral sciences
- Publication Type :
- Academic Journal
- Accession number :
- 38062529
- Full Text :
- https://doi.org/10.1111/eos.12964