Carrabba Michele, Vichi Alessandro, Tozzi Gianluca, Louca Chris, Ferrari Marco
Department of Medical Biotechnologies, Division of Fixed Prosthodontic, University of Siena, Siena, Italy.
Dental Academy, University of Portsmouth, Portsmouth, UK.
J Esthet Restor Dent. 2022 Mar;34(2):423-429. doi: 10.1111/jerd.12587. Epub 2020 Apr 13.
To investigate the influence of opacity and color of luting cements on the final shade of metal-free restorations.
Five resin cement colors in combination with four different thicknesses of CAD/CAM ceramic materials were tested, and a composite substrate was used as dentin color reference (n = 3). Specimen color was measured with a spectrophotometer equipped with an integrating sphere before and after cementation (CIELAB). Cement and ceramic color and opacity (TP) were assessed by measuring the tested ceramic thickness as a 1-mm thick disk for each of the cement shades. The differences in color were evaluated (ΔE ). Data were statistically analyzed by a Two-Way ANOVA followed by the Tukey Test for post-hoc comparison (P < .05) and multiple comparison Pearson's test (P < .05); the acceptability and perceptibility threshold were evaluated.
Statistically significant influence was found for factors ceramic thickness and cement shade (P < .001). Perceptible and unacceptable color changes were induced on the final restoration by resin cements (ranging from ΔE = 0.69 ± 0.54 to ΔE = 5.53 ± 0.46), the correlation between factors became strong (r > 0.6) in case of mismatch between color and translucency of cement and ceramic. Only the clear shade in combination with the thickest ceramic, resulted in an imperceptible color change (ΔE = 0.69 ± 0.54).
The final shade of ceramic restorations can be influenced by resin cements; the magnitude of influence is related to the cement optical properties.
In order to influence the final shade of a ceramic restoration, a cement more opaque than the restorative material should be used. Conversely, in the case of a fitting shade of the restoration, a cement more translucent than the restoration should be used to avoid undesired changes.
研究粘结水门汀的不透明度和颜色对无金属修复体最终色泽的影响。
测试了五种树脂水门汀颜色与四种不同厚度的CAD/CAM陶瓷材料的组合，并使用复合基底作为牙本质颜色参考（n = 3）。在粘结前后用配备积分球的分光光度计测量样本颜色（CIELAB）。通过将测试的陶瓷厚度测量为每种水门汀色度的1毫米厚圆盘来评估水门汀和陶瓷的颜色及不透明度（TP）。评估颜色差异（ΔE）。数据采用双向方差分析，随后进行Tukey检验进行事后比较（P < 0.05）和多重比较Pearson检验（P < 0.05）；评估可接受性和可察觉阈值。
发现陶瓷厚度和水门汀色度因素有统计学意义的影响（P < 0.001）。树脂水门汀在最终修复体上引起了可察觉和不可接受的颜色变化（ΔE范围为0.69±0.54至5.53±0.46），当水门汀和陶瓷的颜色与半透明度不匹配时，因素之间的相关性变强（r > 0.6）。只有最透明的色度与最厚的陶瓷组合，才导致不可察觉的颜色变化（ΔE = 0.69±0.54）。
树脂水门汀可影响陶瓷修复体的最终色泽；影响程度与水门汀的光学性能有关。
为了影响陶瓷修复体的最终色泽，应使用比修复材料更不透明的水门汀。相反，在修复体色泽匹配的情况下，应使用比修复体更透明的水门汀以避免不期望的变化。
