Effect of different surface treatments on optical, colorimetric, and surface characteristics of a lithium disilicate glass–ceramic

Autor: Gabriel Kalil Rocha Pereira, Cornelis J. Kleverlaan, Felipe Nascimento Brescansin, Catina Prochnow, Ataís Bacchi, Luiz Felipe Valandro, Luís Felipe Guilardi
Přispěvatelé: Dental Material Sciences, Oral Regenerative Medicine (ORM)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Journal of Esthetic and Restorative Dentistry, 33(7), 1017-1028. Wiley-Blackwell
Brescansin, F N, Prochnow, C, Guilardi, L F, Kleverlaan, C J, Bacchi, A, Valandro, L F & Pereira, G K R 2021, ' Effect of different surface treatments on optical, colorimetric, and surface characteristics of a lithium disilicate glass–ceramic ', Journal of Esthetic and Restorative Dentistry, vol. 33, no. 7, pp. 1017-1028 . https://doi.org/10.1111/jerd.12793
ISSN: 1708-8240
1496-4155
Popis: © 2021 Wiley Periodicals LLC.Objective: To evaluate the effect of surface treatments on optical, colorimetric, and surface characteristics of lithium disilicate glass–ceramic. Materials and Methods: Specimens (n = 5, IPS e.max CAD) were randomly allocated to the following treatments: mirror-polished: SiC papers; as-cut: mimicking CAD-CAM milling; ground: 90-120 μm-grit diamond bur; ground polished: ground, finished (46-30 μm-grit diamond bur), polished (diamond cups, brush and diamond paste); ground glazed: ground, glazed; ground polished glazed: association of methods. CIELAB color coordinates were obtained by a spectrophotometer. CIEDE2000 color differences (ΔE00) and the translucency parameter (TP00) were calculated. Light transmittance was assessed with a colorimeter. Surface characteristics (topography and roughness) were analyzed. Statistical differences for each condition and outcome were detected using one-way ANOVA with Tukey's post-hoc test (α = 0.05). Results: TP00 data show statistical reduction after grinding (p < 0.05), which was only restored with polishing (solely or with glazing). ΔE00 shows that grinding results in perceptible variations in color (above 0.81), which were restored after all post-processing protocols (exception to only glaze application in contact with a black background). Light transmittance data corroborated such performance. Polishing and glazing reduced roughness and improved surface topography. Conclusion: Grinding statistically increased roughness, reduced translucency, light transmittance through the ceramic, and resulted on color differences. On contrary, polishing (followed or not by glazing) reduced roughness and enhanced ceramic translucency and light transmittance. Glaze also reduced roughness, but it still presented reduced translucency. The positioning (facing up or down) of the ceramic treated surface influenced the considered outcomes. Clinical Significance: Grinding with diamond burs results in a deleterious impact to the optical, colorimetric and surface characteristics of lithium disilicate ceramic. Thus, polishing (followed or not by glazing) is recommended for optical and topographical enhancements when lithium disilicate monolithic restorations require occlusal adjustments.
Databáze: OpenAIRE
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