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Effect of different surface treatments on optical, colorimetric, and surface characteristics of a lithium disilicate glass–ceramic
- Source :
- 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
- Publication Year :
- 2021
- Publisher :
- Wiley-Blackwell, 2021.
-
Abstract
- © 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.
- Subjects :
- Ceramics
Materials science
Surface Properties
0206 medical engineering
Polishing
02 engineering and technology
Surface finish
engineering.material
03 medical and health sciences
0302 clinical medicine
Materials Testing
Transmittance
Ceramic
Composite material
General Dentistry
Glaze
Diamond
030206 dentistry
020601 biomedical engineering
Dental Porcelain
Grinding
Dental Polishing
Glazing
visual_art
visual_art.visual_art_medium
engineering
Colorimetry
Subjects
Details
- Language :
- English
- ISSN :
- 17088240 and 14964155
- Volume :
- 33
- Issue :
- 7
- Database :
- OpenAIRE
- Journal :
- Journal of Esthetic and Restorative Dentistry
- Accession number :
- edsair.doi.dedup.....1ebef6fcccda1a0c361098dae58fead9