Kamishima Naoko, Ikeda Takatsumi, Sano Hidehiko
Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13 Nishi 7, kita-ku, Sapporo 060-8586, Japan.
Dent Mater J. 2005 Sep;24(3):428-32. doi: 10.4012/dmj.24.428.
The purpose of this study was to evaluate the colors of resin composites used for the layering technique, as well as the translucency at various thickness. For the purpose of calculating the translucency parameter (TP), black and white backings were used to evaluate the CIELAB parameters of Filtek Supreme (3M) and Gradia Direct (GC) disks of various thicknesses (0.5, 1.0, 2.0, 3.0 and 4.0 mm) and of three different shades (enamel-shade, body-shade, and opaque-shade). As for the color of each shade, it was evaluated using 4mm thick specimens on the white backing. Regarding TP, the opaque-shades were less translucent than the other shades. It was also found that translucency increased exponentially as thickness was reduced--regardless of shade. Regarding color, enamel-shades were more bluish (especially in GD) compared to the other shades, and the opaque-shades displayed a brighter and yellowish characteristic. In the layering technique, it is fundamental to have an accurate knowledge about the translucency and colors of the materials/shades used.
本研究的目的是评估用于分层技术的树脂复合材料的颜色，以及不同厚度下的半透明度。为了计算半透明度参数（TP），使用黑色和白色背景来评估不同厚度（0.5、1.0、2.0、3.0和4.0毫米）以及三种不同色调（牙釉质色调、主体色调和不透明色调）的Filtek Supreme（3M）和Gradia Direct（GC）圆盘的CIELAB参数。至于每种色调的颜色，使用4毫米厚的样本在白色背景上进行评估。关于TP，不透明色调的半透明度低于其他色调。还发现，无论色调如何，随着厚度的减小，半透明度呈指数增加。关于颜色，与其他色调相比，牙釉质色调更偏蓝（尤其是在GC产品中），而不透明色调则呈现出更明亮和偏黄的特征。在分层技术中，准确了解所使用材料/色调的半透明度和颜色至关重要。
