光源对照度指南颜色分布的影响。

Influence of illuminants on the color distribution of shade guides.

作者信息

Park Ji-Hoon, Lee Yong-Keun, Lim Bum-Soon

机构信息

Department of Dental Biomaterials Science and Dental Research Institute, College of Dentistry, Seoul National University, Seoul, Korea.

出版信息

J Prosthet Dent. 2006 Dec;96(6):402-11. doi: 10.1016/j.prosdent.2006.10.007.

DOI:10.1016/j.prosdent.2006.10.007

PMID:17174657

Abstract

STATEMENT OF PROBLEM

Although a shade tab in a shade guide is matched to a natural tooth in the order of value, hue, and chroma, there are limited data on the color distribution of currently available shade guides sorted by these 3 parameters. Furthermore, spectrophotometric color measurements of shade tabs differ depending on the standard illuminant employed.

PURPOSE

The purpose of this study was to determine the color distributions of 2 shade guides in value (CIE L( *)), chroma (C( *)(ab)) and hue angle (h(o)) scale relative to the standard illuminants D(65), A, and F2.

MATERIAL AND METHODS

Color of shade tabs (n=36) from 2 shade guides (Vita Lumin and Chromascop) were measured, and the distributions for CIE L( *), C( *)(ab) and h(o) values were compared. Color differences of shade tabs depending on the illuminant were calculated. The distributions of the ratios of CIE L( *) and C( *)(ab) values of each shade tab compared with the lowest value tab or the lowest chroma tab were determined. The data for the value, chroma, and hue angle within each shade guide were analyzed with a 2-way ANOVA with the factors of shade designation and type of illuminant (alpha=.05). Color difference caused by change of illuminant was analyzed with a 2-way ANOVA with the factors of shade designation and pair of illuminants compared (alpha=.05). The Scheffe multiple comparison test was performed as a post hoc test.

RESULTS

CIE L( *), C( *)(ab) and h(o) values were influenced by shade designation and type of illuminant in both shade guides. Color difference caused by change of the illuminant was influenced by the shade designation and pair of illuminants compared. The order of mean color differences of 16 Vita Lumin shade tabs by pairs of illuminants compared was as follows: DeltaE( *)(ab) (D(65)/F2) = 1.63 <DeltaE( *)(ab) (D(65)/A) = 2.22 <DeltaE( *)(ab) (A/F2) = 2.46 (P<.05). The order of mean color differences of 20 Chromascop shade tabs was as follows: DeltaE( *)(ab) (D(65)/F2) = 2.45 <DeltaE( *)(ab) (D(65)/A) = 2.71 <DeltaE( *)(ab) (A/F2) = 3.14 (P<.05). The distributions of value and chroma in both shade guides were arbitrary.

CONCLUSION

Color distribution of 2 shade guides varied by the illuminant, and the range of color difference for shade tabs by the illuminant was 0.80 to 4.82, which may be clinically unacceptable (DeltaE( *)(ab) > 3.7). Color distribution of 2 shade guides by the value and chroma was not logical.

摘要

问题陈述

尽管比色板中的色标在明度、色调和彩度顺序上与天然牙齿相匹配，但关于按这三个参数分类的现有比色板颜色分布的数据有限。此外，色标的分光光度颜色测量结果因所采用的标准光源而异。

目的

本研究的目的是确定两种比色板在相对于标准光源D(65)、A和F2的明度（CIE L()）、彩度（C()(ab)）和色调角（h(o)）尺度上的颜色分布。

材料与方法

测量了来自两种比色板（Vita Lumin和Chromascop）的色标（n = 36）的颜色，并比较了CIE L()、C()(ab)和h(o)值的分布。计算了色标因光源而异的颜色差异。确定了每个色标与最低值色标或最低彩度色标相比的CIE L()和C()(ab)值的比率分布。使用二因素方差分析对每个比色板内的明度、彩度和色调角数据进行分析，因素为色标编号和光源类型（α = 0.05）。使用二因素方差分析对因光源变化引起的颜色差异进行分析，因素为色标编号和所比较的光源对（α = 0.05）。进行Scheffe多重比较检验作为事后检验。

结果

在两种比色板中，CIE L()、C()(ab)和h(o)值均受色标编号和光源类型的影响。因光源变化引起的颜色差异受色标编号和所比较的光源对的影响。按所比较的光源对，16个Vita Lumin色标的平均颜色差异顺序如下：ΔE()(ab)(D(65)/F2)=1.63＜ΔE()(ab)(D(65)/A)=2.22＜ΔE()(ab)(A/F2)=2.46（P＜0.05）。20个Chromascop色标的平均颜色差异顺序如下：ΔE()(ab)(D(65)/F2)=2.45＜ΔE()(ab)(D(65)/A)=2.71＜ΔE()(ab)(A/F2)=3.14（P＜0.05）。两种比色板中明度和彩度的分布是任意的。