AI Article Synopsis
- Aesthetic restorations aim to replicate the natural color of teeth, influenced by various factors such as material properties, with little research available on how cement shade and thickness affect zirconia veneers.
- This study assessed the impact of ceramic thickness (0.5mm and 0.7mm) and resin cement shade on the color of ultratranslucent multilayered zirconia veneers using 90 specimens and spectrophotometric measurements.
- Results indicated that thicker veneers showed less color change, with the opaque and brown cement shades causing the most significant color differences compared to other shades, suggesting that both thickness and cement shade are crucial for achieving desired aesthetic outcomes.
Article Abstract
Background: Aesthetic restorations should be able to mimic the natural colour depth of teeth, affected by several factors including material properties. There is a lack of information regarding the effect of cement shade and material thickness on the final colour of ultratranslucent multilayered zirconia veneers.
Objectives: This study evaluated the effect of ceramic thickness and resin cement shade on the final colour of different layers of ultratranslucent multilayered (UTML) zirconia veneers.
Methods: This in vitro study produced 90 rectangular-shaped specimens with nonsintered Katana UTML monolithic zirconia (Kuraray Noritake Dental, Tokyo, Japan), shade A1 blocks. Ceramic samples were prepared in two groups of 0.7 mm and 0.5 mm thicknesses, 45 of each (a: 8 × 11 × 0.5 mm; b: 8 × 11 × 0.7 mm). Specimens of each thickness were further divided into 5 groups: universal, clear, brown, white, and opaque ( = 9). Each adhesive resin cement (Panavia V5) was applied between the ceramic samples and composite substrate. The colour values were measured using a spectrophotometer in baseline and after resin cement application according to the CIELab system. For all samples, ΔE00 values were obtained. Data were evaluated with SPSS 25 using the three-way ANOVA test ( < 0.05).
Results: The factors of cement shade, ceramic thickness, and ceramic layers have statistically significant effect on ΔE00 values ( < 0.001). The results showed lower ΔE00 values with thicker ceramic veneers. Tukey test results showed that the opaque and brown shade had a significantly greater ΔE00 values comparing to universal ( = 0.004), clear, and white shades ( < 0.001).
Conclusion: The colour change was greater in lower ceramic thickness. Different shades of resin cement and layers of UTML zirconia differently affected the final colour.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9177338 | PMC |
| http://dx.doi.org/10.1155/2022/2555797 | DOI Listing |
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