Kim Bong-Joon, Lee Yong-Keun
Department of Dental Biomaterials Science and Dental Research Institute, School of Dentistry, Seoul National University, 28 Yeongeon-dong, Jongro-gu, Seoul, Republic of Korea.
Dent Mater. 2009 Sep;25(9):1148-54. doi: 10.1016/j.dental.2009.04.001. Epub 2009 May 15.
The objectives were to measure the difference in color and color coordinates between the same shade-designated resin composites from different brands, and to determine the influence of shade designation on the difference in color and color coordinates between them.
Eight light-curing resin composites, a total of 32 shades, were investigated. Color of specimens (1 mm in thickness) was measured on a reflection spectrophotometer over a white background. Differences in color (DeltaEab*) and color coordinates such as CIE L* (lightness), a* (red-green coordinate) and b* (yellow-blue coordinate) between each pair of the same shade-designated resin composites were calculated. The influence of the shade designation on these differences was analyzed with one-way analysis of variance (p<0.05).
The range of DeltaL* between the same shade-designated resin composites by the brand was 0.1-10.2 (mean: 2.9), that of Deltaa* was 0.0-2.4 (mean: 0.9), that of Deltab* was 0.1-7.0 (mean: 2.0) and that of DeltaEab* was 0.7-11.0 (mean: 4.2). DeltaL* and Deltaa* were not influenced by the shade designation; however, Deltab* and DeltaEab* were influenced by the shade designation based on one-way ANOVA (alpha=0.05). Half of the color difference values between the same shade-designated resin composites were perceptible (42 pairs among 83 pairs, DeltaEab*>3.7).
Since the color difference between the same shade-designated resin composite from different brands varied by the shade designation and was perceptible in more than half of the compared pairs (DeltaEab*>3.7), optical properties of resin composites should be considered differently by the shade designation and brand when selecting these materials.
本研究旨在测量不同品牌相同色号指定的树脂复合材料之间的颜色及颜色坐标差异，并确定色号指定对它们之间颜色及颜色坐标差异的影响。
对8种光固化树脂复合材料，共32个色号进行了研究。在白色背景下，使用反射分光光度计测量厚度为1mm的试样颜色。计算相同色号指定的每对树脂复合材料之间的颜色差异（ΔEab*）以及颜色坐标，如CIE L*（明度）、a*（红-绿坐标）和b*（黄-蓝坐标）。采用单因素方差分析（p<0.05）分析色号指定对这些差异的影响。
不同品牌相同色号指定的树脂复合材料之间，ΔL的范围为0.1-10.2（平均值：2.9），Δa的范围为0.0-2.4（平均值：0.9），Δb的范围为0.1-7.0（平均值：2.0），ΔEab的范围为0.7-11.0（平均值：4.2）。ΔL和Δa不受色号指定的影响；然而，基于单因素方差分析（α=0.05），Δb和ΔEab受色号指定的影响。相同色号指定的树脂复合材料之间，一半的颜色差值是可察觉的（83对中有42对，ΔEab*>3.7）。
由于不同品牌相同色号指定的树脂复合材料之间的颜色差异因色号指定而异，且在超过一半的比较对中是可察觉的（ΔEab*>3.7），因此在选择这些材料时，应根据色号指定和品牌对树脂复合材料的光学性能进行不同的考虑。
