Paravina Rade D, Johnston William M, Powers John M
Department of Restorative Dentistry and Biomaterials, and Houston Biomaterials Research Center, University of Texas Dental Branch at Houston, TX 77030-3402, USA.
J Esthet Restor Dent. 2007;19(5):276-83; discussion 283. doi: 10.1111/j.1708-8240.2007.00118_1.x.
Available shade guides lack colorimetric uniformity, which compromises the validity of visual evaluation of tooth whitening efficacy.
The objective of this study was to perform a colorimetric analysis of a new shade guide designed primarily for the visual evaluation of tooth whitening efficacy and to compare this shade guide with two commercial shade guides.
Color ranges and color distribution of three shade guides (prototype of the new Vita Bleachedguide 3D-Master [BG, Vita Zahnfabrik, Bad Säckingen, Germany], value scale of Vitapan Classical [VC, Vita], and color-ordered Trubyte Bioform porcelain shade guide [TB, Dentsply International, York, PA, USA]) were analyzed (N=3). A circular area (d=1.7 mm) on the middle of the labial surface of the tab, excluding the cervical portion, was measured with a spectroradiometer (D65, 2). Whiteness and yellowness indices were computed. Data were analyzed by analysis of variance and Fisher's PLSD test at a 0.05 level of significance.
The range of color difference (DeltaE*) from the lightest to the darkest tab was 33.8 (BG), 17.1 (VC), and 23.2 (TB). Mean values of DeltaE* among pairs of adjacent tabs were 3.0 (BG), 4.2 (VC), and 3.3 (TB). BG exhibited the highest R2 values between color coordinate pairs and between whiteness and yellowness indices with the respective color coordinates.
BG exhibited the widest color range and had the most consistent color distribution as compared with the two commercial products. Extension of the lightness range of BG toward higher L* values (bleach shades) was confirmed.
A dental shade guide that is colorimetrically uniform might increase the reliability of visual comparisons of tooth whitening efficacy, whereas the inclusion of realistic bleaching shades in the shade guide will complement contemporary esthetic dentistry.
现有的比色板缺乏色度均匀性，这损害了牙齿美白效果视觉评估的有效性。
本研究的目的是对一种主要为牙齿美白效果视觉评估设计的新型比色板进行色度分析，并将该比色板与两种商用比色板进行比较。
分析了三种比色板（新型维他漂白比色板3D - 大师版原型[BG，德国维他齿科公司，巴特萨金根]、维他经典比色板的明度标度[VC，维他]和按颜色顺序排列的特鲁比泰生物形态瓷比色板[TB，登士柏国际公司，宾夕法尼亚州约克]）的颜色范围和颜色分布（N = 3）。使用分光辐射计（D65，2）测量比色板唇面中部（不包括颈部）直径为1.7 mm的圆形区域。计算白度和黄度指数。数据采用方差分析和Fisher最小显著差异检验进行分析，显著性水平为0.05。
从最浅到最深比色板的色差（ΔE*）范围分别为33.8（BG）、17.1（VC）和23.2（TB）。相邻比色板对之间的ΔE*平均值分别为3.0（BG）、4.2（VC）和3.3（TB）。BG在颜色坐标对之间以及白度和黄度指数与各自颜色坐标之间表现出最高的R2值。
与两种商用产品相比，BG表现出最宽的颜色范围和最一致的颜色分布。证实了BG的明度范围向更高L*值（漂白色）的扩展。
色度均匀的牙科比色板可能会提高牙齿美白效果视觉比较的可靠性，而比色板中包含逼真的漂白色将补充当代美学牙科。
