Abstract
Background. Effects of veneering porcelain thickness and background shade on the shade match of zirconia-based restorations are unclear. The aim of this study was to evaluate the impacts of veneering porcelain thickness and background shade on the shade match of zirconia-based restorations. Methods. Forty A2 shade veneered zirconia disk specimens (10 mm in diameter) were fabricated, with veneering porcelain thicknesses of 1.6, 1.8, 2.0 and 2.2 mm. Three backgrounds were made of A2 shade composite resin (A2), nickel-chromium alloy (NC) and amalgam (AM). The veneered zirconia specimens were placed on the backgrounds. CIELab values were measured with a spectrophotometer. ΔE values were measured to determine color differences between the specimens and the A2 VITA classical shade (target shade). ΔE values were compared with an acceptability threshold (ΔE=3.7). Repeated measures ANOVA, Bonferroni, and 1-sample t-test were used to analyze data (P<0.05). Results. Mean ΔE values ranged between 1.9 and 5.0. The veneering porcelain thickness, the background shade and their interaction affected the ΔE (P<0.0001). The minimum veneering porcelain thickness for the shade match was 2 mm for NC and 1.8 mm for AM. Conclusion. Veneering porcelain thickness and background shade affected the shade match of zirconia-based restorations. With dark-shaded backgrounds, the amount of veneering porcelain thickness needed for the shade match might be beyond acceptable clinical limits. Tooth-shaded backgrounds are esthetically advocated rather than dark-shaded backgrounds in zirconia-based restorations.
Highlights
Zirconia-based restorations are an acceptable treatment option in restorative dentistry because of their appropriate strength and esthetics.[1,2,3] Zirconia-JODDD, Vol 13, No 1 Winter 2019 based restorations have two components, including a zirconia coping and a veneering porcelain
The aim of this study was to evaluate the impacts of veneering porcelain thickness and background shade on the shade match of zirconia-based restorations
With dark-shaded backgrounds, the amount of veneering porcelain thickness needed for the shade match might be beyond acceptable clinical limits
Summary
Zirconia-based restorations are an acceptable treatment option in restorative dentistry because of their appropriate strength and esthetics.[1,2,3] Zirconia-JODDD, Vol 13, No 1 Winter 2019 based restorations have two components, including a zirconia coping and a veneering porcelain. Zirconia copings represent benefits of high fracture strength,[4] proper optical properties[5] and a white-to-ivory color.[6] Veneering porcelains create a tooth-like appearance due to their proper shade, translucency and tooth-like appearance.[7] zirconia-based restorations have become popular in dentistry.[8]. One of the most commonly applied color systems in dentistry is CIELab, in which L*, a* and b* denote lightness, redness-greenness, and yellowness-blueness, respectively.[9,10] the CIELab is used to determine the color difference between two objects. Effects of veneering porcelain thickness and background shade on the shade match of zirconia-based restorations are unclear. The aim of this study was to evaluate the impacts of veneering porcelain thickness and background shade on the shade match of zirconia-based restorations
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