Lu Huan, Lee Yong-Keun, Villalta Patricia, Powers John M, Garcia-Godoy Franklin
Department of Restorative Dentistry, Center for Dental Research, Loma Linda University School of Dentistry, Loma Linda, CA, USA.
J Prosthet Dent. 2006 Nov;96(5):322-7. doi: 10.1016/j.prosdent.2006.08.007.
Color of fluorescent substances is influenced by the amount of ultraviolet (UV) component in the illumination. Color of fluorescent dental composite resins may change by the amount of UV component in the ambient light, but there have been few studies on this subject.
The purpose of this study was to determine the differences in color and color parameters such as lightness, chroma, and hue of composite resins created by varying the amount of UV component of a pulsed-xenon source that is conditioned to approximate the Commission Internationale de l'Eclairage (CIE) standard illuminant D65.
A spectrophotometer, in which the UV component of a daylight simulator could be adjusted, was developed. Eight light-polymerized dental composite resins, A3 shade, were studied. Five disk-shaped specimens, 10 x 3 mm, were prepared for each material. Color of specimens was measured on a reflection spectrophotometer over a white background relative to 3 illuminations, which had the same spectral power distribution of the CIE standard illuminant D65 in visible range, but different UV component. D65 indicated the illumination in which the UV component of the pulsed-xenon source was adjusted to the CIE standard illuminant D65 using a UV adjustment tile. UV-EXC indicated the illumination in which the UV component of the source was excluded with a UV filter. UV-INC indicated the illumination in which the UV component was included. Differences in color parameters by the illumination were analyzed with repeated-measures 1-way analysis of variance (ANOVA) by the brand of composite resins. Differences in color (DeltaE*(ab)) and color parameters such as lightness (DeltaL*), chroma (DeltaC*(ab)), and hue angle (Deltah) were analyzed with 3-way ANOVA, with the independent variables of brand of composite resin, combination of illuminations, and type of color parameters (alpha = .05).
Color differences (DeltaE*(ab)) by the amount of UV component in the illuminations ranged between 0.3 and 1.4 for D65 and UV-EXC, between 0.3 and 0.5 for D65 and UV-INC, and between 0.2 and 1.6 for UV-EXC and UV-INC. Based on the repeated-measures ANOVA, lightness was not influenced by the amount of the UV component in the illumination, however, chroma and hue angle were influenced by the amount of UV component. Based on the 3-way ANOVA, differences in color and color parameters (DeltaE*(ab), DeltaL*, DeltaC*(ab), and Deltah) by the amount of the UV component were influenced by all of the 3 factors, and there were significant interactions between all the combinations of factors (P < .05).
Though there were significant differences in color and color parameters by the amount of the UV component in the D65-simulated xenon source, color difference caused by the UV component was lower than 1.6, which is in the visually acceptable range.
荧光物质的颜色受照明中紫外线（UV）成分含量的影响。荧光牙科复合树脂的颜色可能会因环境光中UV成分的含量而改变，但关于这一主题的研究很少。
本研究的目的是确定通过改变脉冲氙光源的UV成分含量所制备的复合树脂在颜色和颜色参数（如明度、彩度和色调）上的差异，该脉冲氙光源经过调节以近似国际照明委员会（CIE）标准照明体D65。
研制了一种可调节日光模拟器UV成分的分光光度计。研究了8种A3色号的光固化牙科复合树脂。每种材料制备5个直径10mm、厚3mm的圆盘形试样。在白色背景下，使用反射分光光度计相对于3种照明测量试样的颜色，这3种照明在可见光范围内具有与CIE标准照明体D65相同的光谱功率分布，但UV成分不同。D65表示使用UV调节片将脉冲氙光源的UV成分调节至CIE标准照明体D65的照明。UV - EXC表示用UV滤光片排除光源UV成分的照明。UV - INC表示包含UV成分的照明。通过复合树脂品牌，采用重复测量单因素方差分析（ANOVA）分析不同照明下颜色参数的差异。采用三因素方差分析分析复合树脂品牌、照明组合和颜色参数类型（α = 0.05）这3个自变量对颜色（ΔE*(ab)）和颜色参数（如明度（ΔL*）、彩度（ΔC*(ab)）和色调角（Δh））的差异。
D65与UV - EXC之间，照明中UV成分含量导致的颜色差异（ΔE*(ab)）在0.3至1.4之间；D65与UV - INC之间在0.3至0.5之间；UV - EXC与UV - INC之间在0.2至1.6之间。基于重复测量方差分析，明度不受照明中UV成分含量的影响，然而，彩度和色调角受UV成分含量的影响。基于三因素方差分析，UV成分含量导致的颜色和颜色参数（ΔE*(ab)、ΔL*、ΔC*(ab)和Δh）差异受所有3个因素影响，且各因素组合之间存在显著交互作用（P < 0.05）。
尽管在D65模拟氙光源中，UV成分含量在颜色和颜色参数上存在显著差异，但UV成分导致的颜色差异低于1.6，处于视觉可接受范围内。
