Lee Yong-Keun, Powers John M
Department of Dental Biomaterials Science, Dental Research Institute, College of Dentistry, Seoul National University, 28 Yeongeon-dong, Jongro-gu, Seoul, Korea.
Am J Dent. 2005 Oct;18(5):359-63.
To determine the difference in lightness, chroma, hue angle and color of four kinds of esthetic restorative materials of the same shade designation by the change of standard illuminants of D65 (daylight), A (incandescent lamp) and F2 (fluorescent lamp).
Spectral reflectance and color of four resin composites, a glass ionomer, a resin-modified glass ionomer and a compomer of shade A2 were measured according to the CIELAB color scale relative to the illuminants D65, A and F2. Spectral reflectance curves were compared, and changes in lightness (deltaL*), chroma (deltaCab), hue angle (deltah degrees) and color (deltaEab) by the changes of illuminants from D65 to A or F2 were compared as "value relative to the illuminant A or F2 - value relative to the illuminant D65".
In curves of spectral reflectance, the curves were in the similar range of reflectance (%) except glass ionomer. Changes in lightness were low (0.42-1.27), and changes in chroma were 0.26-2.23 for both conditions. These values were different by the kind of materials. The magnitude of the changes in hue angle was the most prominent in both conditions and was significantly different by the illuminants of A and F2 (P< 0.05). The range of color difference was 1.13-3.02 in both conditions.
通过D65（日光）、A（白炽灯）和F2（荧光灯）标准光源的变化，确定四种相同色号的美学修复材料在明度、彩度、色相角和颜色方面的差异。
根据CIELAB色标，测量四种树脂复合材料、一种玻璃离子水门汀、一种树脂改性玻璃离子水门汀和一种A2色号的复合体相对于D65、A和F2光源的光谱反射率和颜色。比较光谱反射率曲线，并将光源从D65变为A或F2时明度（ΔL*）、彩度（ΔCab）、色相角（Δh°）和颜色（ΔEab）的变化作为“相对于光源A或F2的值 - 相对于光源D65的值”进行比较。
在光谱反射率曲线中，除玻璃离子水门汀外，曲线的反射率（%）范围相似。两种情况下明度变化较小（0.42 - 1.27），彩度变化为0.26 - 2.23。这些值因材料种类而异。两种情况下色相角变化幅度最为显著，且A和F2光源下差异有统计学意义（P < 0.05）。两种情况下色差范围为1.13 - 3.02。
