The combined effect of light-illuminating direction and enamel rod orientation on color adjustment at the enamel borders of composite restorations
The combined effect of light-illuminating direction and enamel rod orientation on color adjustment at the enamel borders of composite restorations
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DOI：
10.1007/s00784-019-03085-7
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发表时间：
2019-10-24
影响因子：
3.4
通讯作者：
Nakajima, Masatoshi
中科院分区：
文献类型：
--
作者：
Hatayama, Takashi;Kano, Yukinori;Nakajima, Masatoshi
目的探讨复合牙体和牙釉质侧光照方向对复合牙体冠、颈牙釉质边界颜色调节的影响。材料与方法在牛牙釉质盘（厚度1.0 mm）上制备40个直径3.0 mm的圆柱孔。在使用一步自蚀刻粘合剂后，将四种树脂复合材料（Estelite Asteria， EA; Estelite Pro， EP; Kalore， KA; Clearfil Majesty ES-2 Premium， MJ）中的一种修复在孔中。保存24小时后，使用CIE XYZ相机在黑盒中测量修复后的搪瓷盘在黑色背景上的颜色（L*， C*或h*值），使用D65标准光源从冠状侧或颈侧以45度/0度几何形状照射。计算复合修复体冠状和颈牙釉质边界的色移率，采用Dunnett’s T3和事后t检验的三因素方差分析（p < 0.05）。结果光照方向对EP和MJ颈牙釉质边界的L*移动速率和EA、EP和MJ冠状牙釉质边界的C*移动速率有显著影响（p < 0.05）。结论复合修复体边缘的颜色外观受光照方向及冠状牙釉质边界或颈牙釉质边界牙釉质棒方向的影响。
Objectives To investigate the effect of light-illuminating direction (from composite or enamel side) on color adjustment at the coronal and cervical enamel borders in composite restorations. Materials and methods Forty cylindrical holes (3.0-mm diameters) were prepared in bovine enamel disks (1.0-mm thickness). After application of a one-step self-etch adhesive, one of four resin composites (Estelite Asteria, EA; Estelite Pro, EP; Kalore, KA; Clearfil Majesty ES-2 Premium, MJ) was restored in the holes. After 24-h storage, the colors (L*, C*, or h* values) at the restored enamel disks over a black background were measured in a black box using a CIE XYZ camera, spotted with D65 standard illuminant either from coronal or cervical side at 45 degrees/0 degrees geometry. The color shifting rate was calculated at the coronal and cervical enamel borders of the composite restorations, and analyzed by three-way ANOVA with Dunnett's T3 and t test for post hoc analysis (p < 0.05). Results The light-illuminating directions significantly affected the L* shifting rate at the cervical enamel border in EP and MJ (p < 0.05), and the C* shifting rate at the coronal enamel border in EA, EP, and MJ (p < 0.05). Conclusions The color appearance at the border of the composite restoration was influenced by the light-illuminating direction in conjunction with the enamel rod orientation in the coronal or cervical enamel border.