Lee Yong-Keun, Kim Ji-Hyung, Ahn Jin-Soo
Department of Dental Biomaterials Science and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.
J Prosthet Dent. 2007 Jun;97(6):375-80. doi: 10.1016/S0022-3913(07)60026-2.
Daylight illumination varies during the day due to weather or other conditions which change the amount of the UV component in daylight. The level of the UV component in daylight may influence the color of fluorescent composite resins used for anterior restorations.
The purpose of this study was to measure the fluorescence emission and the corresponding color change of dental composite resins as affected by the included percentage of the UV component of a daylight simulator (pulsed-xenon source simulating the CIE standard illuminant D65).
Spectral reflectance and color of 4 brands of composite resins (Filtek Supreme, Estelite Sigma, Point 4, and Vit-l-escence) were measured over a white tile according to the CIELAB color scale relative to the UV adjusted illuminant D65. A UV filter of a spectrophotometer was adjusted to change the UV component of the illuminant D65. From the spectral reflectance values, subtraction spectra between the spectra in UV-included conditions (20, 40, 60, 80, and 100%) and that in the 0% UV condition of the illuminant D65 were calculated. Color difference (DeltaE*(ab)) between each of the UV-included conditions and the 0% UV condition was also calculated. Color difference caused by the included percentage of the UV component, compared with the 0% UV condition, was analyzed with 2-way ANOVA (alpha=.05).
Three of the 4 composite resins tested showed fluorescence peaks at approximately 440 nm. Peak height based on subtraction spectra was in the range of 0.39 to 2.42. Color difference (range = 0.32 to 2.72 DeltaE*(ab) units) was influenced by the included percentage of the UV component and the brand of composite resin (P<.001). Color difference caused by the included percentage of the UV component was as high as 2.72.
The percentage of the UV component of the daylight simulator influenced the color of composite resins.
由于天气或其他条件会改变日光中紫外线成分的含量，所以日光照明在一天中会有所变化。日光中紫外线成分的水平可能会影响用于前牙修复的荧光复合树脂的颜色。
本研究的目的是测量牙科复合树脂的荧光发射以及相应的颜色变化，这些变化受日光模拟器（模拟CIE标准照明体D65的脉冲氙光源）中紫外线成分所占百分比的影响。
根据CIELAB色标，在白色瓷砖上测量4种品牌复合树脂（Filtek Supreme、Estelite Sigma、Point 4和Vit-l-escence）相对于紫外线调整后的照明体D65的光谱反射率和颜色。调整分光光度计的紫外线滤光片以改变照明体D65的紫外线成分。根据光谱反射率值，计算紫外线包含条件（20%、40%、60%、80%和100%）下的光谱与照明体D65的0%紫外线条件下的光谱之间的减法光谱。还计算了每个紫外线包含条件与0%紫外线条件之间的色差（DeltaE*(ab)）。采用双向方差分析（α = 0.05）分析与0%紫外线条件相比，由紫外线成分所占百分比引起的色差。
测试的4种复合树脂中有3种在约440 nm处显示荧光峰。基于减法光谱的峰高在0.39至2.42范围内。色差（范围 = 0.32至2.72 DeltaE*(ab)单位）受紫外线成分所占百分比和复合树脂品牌的影响（P <.001）。由紫外线成分所占百分比引起的色差高达2.72。
日光模拟器中紫外线成分的百分比影响复合树脂的颜色。
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