The effect of a coupling medium on color and translucency of CAD-CAM ceramics
The effect of a coupling medium on color and translucency of CAD-CAM ceramics
复制标题
DOI：
10.1016/j.jdent.2013.02.005
复制
发表时间：
2013-08-01
影响因子：
4.4
通讯作者：
Della Bona, Alvaro
中科院分区：
文献类型：
--
作者：
Nogueira, Audrea Dallazem;Della Bona, Alvaro
目的：评价陶瓷的颜色和透明度以及耦合介质的影响（G -甘油）对这些光学性质的影响，检验甘油影响透明度值的假设，无论评估方法如何。A2着色陶瓷的五个样品（IPS e.max CAD HT和LT，IPS Empress CAD HT和LT，Paradigm C，和Vita Mark II）由陶瓷块制成并抛光至1.0 +/-0.01mm厚。使用分光光度计（Vita Easyshade）测量置于白色和黑色背景上的样品的CIELAB坐标和反射率值（Y）。计算透射参数（TP）和对比度（CR）。另一分光光度计（Lambda 20）用于测量样品的直射光透射率（T%）。使用Vita Easyshade在中性灰色背景上评价颜色和CIELAB坐标，并使用值计算色差（DE）。使用G重复所有评价并记录值。使用Anova、Tukey和Student t检验对数据进行统计分析结果：虽然每种方法的平均透明度值有显著差异，（TP和CR），它们强相关（r（2）= 0.97），即使使用G（r（2）= 0.96）。耦合介质显著影响DE和透明度的平均值。临床意义：如果使用不同的耦合介质（例如空气和液体甘油）进行测量，则无法比较颜色和透明度值。(C)2013爱思唯尔有限公司保留所有权利。
Objectives: To evaluate color and translucency of ceramics and the influence of a coupling medium (G - glycerin) on these optical properties, testing the hypothesis that glycerin influences the translucency values regardless the evaluation method.Methods: Five specimens from A2-shaded ceramics (IPS e.max CAD HT and LT, IPS Empress CAD HT and LT, Paradigm C, and Vita Mark II) were fabricated from ceramic blocks and polished to 1.0 +/- 0.01 mm in thickness. A spectrophotometer (Vita Easyshade) was used to measure the CIELAB coordinates and the reflectance value (Y) of specimens placed on white and black backgrounds. The translucency parameter (TP) and the contrast ratio (CR) were calculated. Another spectrophotometer (Lambda 20) was used to measure the direct light transmittance (T%) of the specimens. The color and the CIELAB coordinates were evaluated using the Vita Easyshade on neutral grey background and values were used to calculate difference in color (DE). All evaluations were repeated using G and values were recorded. Data were statistically analyzed using Anova, Tukey and Student's t-test (alpha = 0.05) and Pearson's correlation.Results: Although the mean translucency values were significantly different for each method (TP and CR), they were strongly correlated (r(2) = 0.97), even when G was used (r(2) = 0.96).Conclusion: The coupling medium significantly influenced the mean values of DE and translucency. Clinical significance: Color and translucency values cannot be compared if measured using different coupling media (e.g. air and liquid glycerin). (C) 2013 Elsevier Ltd. All rights reserved.