Kamishima Naoko, Ikeda Takatsumi, Sano Hidehiko
Department of Restorative Dentistry, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Sapporo, Japan.
Dent Mater J. 2006 Mar;25(1):26-31. doi: 10.4012/dmj.25.26.
The purpose of this study was to evaluate the effect of the covering enamel layer of various thicknesses on the color of layered resin composites (LRC). To this end, the CIELAB parameters of the following were evaluated: underlying base (ULB: 2.0 mm of body shade + 3.0 mm of opaque shade), inherent color of the enamel shade (4.0 mm of enamel shade + ULB), and LRC disks (0.5, 1.0, 2.0, 3.0 mm of enamel shade + ULB) of Filtek Supreme (FS, 3M) and Gradia Direct (GD, GC). To assess the effect of the enamel layer on the color of LRC, color difference between ULB and LRC was calculated. With FS, the enamel layer had no major effect on the color of LRC--regardless of thickness. With GD, the enamel layer had a significant effect on the color of LRC, even if the thickness was only 0.5 mm. The difference in enamel layer effect between the two products could be attributed to the difference in color characteristics of the two enamel shades.
本研究的目的是评估不同厚度的覆盖釉质层对分层树脂复合材料（LRC）颜色的影响。为此，对以下各项的CIELAB参数进行了评估：底层基底（ULB：2.0 mm的主体色 + 3.0 mm的不透明色）、釉质色的固有颜色（4.0 mm的釉质色 + ULB）以及Filtek Supreme（FS，3M公司）和Gradia Direct（GD，GC公司）的LRC圆盘（0.5、1.0、2.0、3.0 mm的釉质色 + ULB）。为了评估釉质层对LRC颜色的影响，计算了ULB与LRC之间的颜色差异。对于FS，无论厚度如何，釉质层对LRC的颜色都没有重大影响。对于GD，即使厚度仅为0.5 mm，釉质层对LRC的颜色也有显著影响。两种产品之间釉质层效果的差异可归因于两种釉质色颜色特征的差异。
