Lee Yong-Keun, Powers John M
Department of Dental Biomaterials Science and Dental Research Institute, College of Dentistry, Seoul National University, Korea.
Am J Dent. 2006 Oct;19(5):283-8.
To determine the influence of opalescence and fluorescence properties on the light transmittance of resin composites as a function of wavelength (410-750 nm).
Spectral distribution of seven resin composites of A2 shade was measured according to the CIELAB color scale relative to the standard illuminant D65 in the reflectance and transmittance modes. Opalescence spectrum (OPS) was calculated as the subtraction spectrum (i.e., the spectrum measured in the transmittance mode subtracted at each wavelength from the spectrum measured in the reflectance mode). UV component of the illuminant was included and excluded to calculate the fluorescence spectrum (FLR and FLT in the reflectance and transmittance mode, respectively). Contrast ratio (CR) was calculated as the ratio of reflectance over a black background and over a white background. The total transmittance spectral distribution (TSD) value was used as the parameter to indicate masking ability of the resin composites over background color. Multiple regression analyses were performed among TSD and other optical parameters at the significance level of 0.05.
In all the resin composites and wavelength range, correlation between CR and TSD was very high (r = -0.99). Correlations between each parameters varied by the wavelength range of fluorescence (410-500 nm) and no-fluorescence (510-750 nm). Correlation between OPS and TSD varied by the wavelength range (r = -0.86 to -0.94, P< 0.05). Fluorescence of resin composites increased the TSD values. Based on this in vitro study, the influence of opalescence and fluorescence of resin composite varied by the wavelength.
确定乳光和荧光特性对树脂复合材料透光率随波长（410 - 750 nm）变化的影响。
根据CIELAB色标，在相对于标准照明体D65的反射率和透光率模式下，测量七种A2色树脂复合材料的光谱分布。乳光谱（OPS）计算为减法光谱（即在每个波长下，将透光率模式下测量的光谱从反射率模式下测量的光谱中减去）。分别计算包含和排除照明体紫外线成分时的荧光光谱（反射率模式下为FLR，透光率模式下为FLT）。对比度（CR）计算为黑色背景和白色背景上反射率的比值。总透光率光谱分布（TSD）值用作指示树脂复合材料对背景颜色遮盖能力的参数。在0.05的显著性水平下，对TSD和其他光学参数进行多元回归分析。
在所有树脂复合材料和波长范围内，CR与TSD之间的相关性非常高（r = -0.99）。各参数之间的相关性因荧光波长范围（410 - 500 nm）和非荧光波长范围（510 - 750 nm）而异。OPS与TSD之间的相关性因波长范围而异（r = -0.86至-0.94，P < 0.05）。树脂复合材料的荧光增加了TSD值。基于这项体外研究，树脂复合材料的乳光和荧光影响因波长而异。
