Microstructural and flexural strength of various CAD-CAM lithium disilicate ceramics.

Autor: Zaniboni JF; Department of Restorative Dentistry, School of Dentistry, Araraquara, São Paulo State University (UNESP), Araraquara, São Paulo, Brazil.; School of Dentistry (FAODO), Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Mato Grosso do Sul, Brazil., Silva AS; Department of Restorative Dentistry, School of Dentistry, Araraquara, São Paulo State University (UNESP), Araraquara, São Paulo, Brazil., Silva AM; Department of Restorative Dentistry, Federal University of Piauí (UFPI), Teresina, Piauí, Brazil., Besegato JF; School of Dentistry (FAODO), Federal University of Mato Grosso do Sul (UFMS), Campo Grande, Mato Grosso do Sul, Brazil., Muñoz-Chávez OF; Department of Restorative Dentistry, School of Dentistry, Araraquara, São Paulo State University (UNESP), Araraquara, São Paulo, Brazil., de Campos EA; Department of Restorative Dentistry, School of Dentistry, Araraquara, São Paulo State University (UNESP), Araraquara, São Paulo, Brazil.
Jazyk: angličtina
Zdroj: Journal of prosthodontics : official journal of the American College of Prosthodontists [J Prosthodont] 2024 Sep 04. Date of Electronic Publication: 2024 Sep 04.
DOI: 10.1111/jopr.13938
Abstrakt: Purpose: To analyze the microstructural and mechanical properties of various commercial trademarks of lithium disilicate ceramics for CAD-CAM systems.
Materials and Methods: Specimens of different lithium disilicate ceramics were obtained and randomized into 5 groups (n = 14): EM: e.max CAD; RT: Rosetta SM; EV: Evolith; PM: Smile-Lithium CAD; and, HS: HaHaSmile. The microstructural analysis was performed by X-ray diffraction (XRD) and scanning electron microscopy (SEM); for flexural strength, the three-point bending flexure test was used. XRD and SEM data were qualitatively evaluated. Data from flexural strength were assessed with one-way ANOVA test (α = 0.05) and Weibull analysis.
Results: High peaks corresponding to the lithium metasilicate and lithium disilicate pattern with similar intensities were observed in all ceramics in the XRD analysis. SEM images showed similar patterns of crystalline structure in the EM and RT ceramics, while the other three groups presented different crystal morphologies than the previous ones and were similar to each other. No differences were found in flexural strength among the groups (p = 0.28).
Conclusions: The CAD-CAM lithium disilicate ceramics showed comparable crystalline intensities. The microstructure of the EM and RT ceramics were different from the other groups. Flexural strength was similar among all ceramics.
(© 2024 by the American College of Prosthodontists.)
Databáze: MEDLINE
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