Aida Asami, Nakajima Masatoshi, Seki Naoko, Kano Yukinori, Foxton Richard M, Tagami Junji
Cariology and Operative Dentistry, Oral Restitution Department, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.
Dent Mater J. 2016;35(4):675-83. doi: 10.4012/dmj.2016-039.
This study aimed to investigate the effect of enamel margin configuration on color change of resin composite restoration. Enamel disks of 1.0 mm-thick were sliced from sixty bovine anterior teeth and divided into three groups by margin configuration (non-bevel, 45-degree bevel and 45-degree reverse-bevel). The color measurements (LCh* values) at the restored bovine enamel disk with resin composite (Estelite Asteria, Estelite Pro, Kalore, Clearfil Majesty) were performed using a digital camera with CIE XYZ color gamut (RC500). All the resin composite restorations with non-beveled and beveled cavities significantly increased L* values compared with the control composite disks (p<0.05). The bevel preparation increased L* values toward the enamel-composite border with gentle inclination, while the reverse-bevel preparation was significantly lower L* values at the enamel-composite border than the non-bevel preparation (p<0.05). Enamel margin configuration affected color shifting of resin composite restoration and color adjustment of the border.
本研究旨在探讨釉质边缘形态对树脂复合材料修复体颜色变化的影响。从60颗牛前牙切取厚度为1.0mm的釉质片，并根据边缘形态分为三组（无斜面、45度斜面和45度反斜面）。使用具有CIE XYZ色域的数码相机（RC500）对用树脂复合材料（Estelite Asteria、Estelite Pro、Kalore、Clearfil Majesty）修复的牛釉质片进行颜色测量（LCh值）。与对照复合片相比，所有无斜面和有斜面窝洞的树脂复合材料修复体的L值均显著增加（p<0.05）。斜面预备使L值朝着釉质-复合材料边界呈平缓倾斜增加，而反斜面预备在釉质-复合材料边界处的L值显著低于无斜面预备（p<0.05）。釉质边缘形态影响树脂复合材料修复体的颜色变化和边界的颜色调整。
