ArticleBrazilian dental journal2025
Effect of thickness and surface finish on light transmission through zirconia-reinforced lithium silicate and lithium disilicate dental ceramics.
Article in Brazilian dental journal, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study evaluated the influence of thickness and surface finish on the light transmission of specific wavelengths of light through ceramics. Blocks of a zirconia-reinforced lithium silicate (Celtra Duo, Dentsply Sirona) and lithium disilicate glass-ceramic (IPS e.max CAD, Ivoclar Vivadent) were sectioned into slices (0.25 - 3.30 mm thick) and prepared following their manufacturers' instructions. The surface gloss and light transmission through the Celtra Duo were measured: first without treatment, then after polishing, after polishing with diamond paste, and finally after glazing. Transmission through e.max was measured only after glazing. The % transmission and light attenuation coefficients were measured through each thickness at: 396, 406, 447, 454, 465, and 476 nm using a spectrometer. The beam profiles were measured and qualitatively analyzed. Data were subjected to 1-way ANOVA and Tukey HSD test (α = 0.05). Only 6% of the light at 396 nm and 21 to 26% at 476 nm passed through 1.5 mm of both ceramics. Almost none of the violet light and only 6% and 9% of the blue light could be detected through 3.0 mm of each ceramic. At the longer wavelengths, more light was transmitted through Celtra Duo. When glazed, Celtra Duo had higher surface gloss compared to e.max. As the ceramic thickness increased, there was a logarithmic decrease in light transmission. The violet light was more attenuated than the blue light. No correlation was found between the surface gloss and the amount of light transmitted, irrespective of the glass ceramic type.
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