Diamantopoulou Sofia, Papazoglou Efstratios, Margaritis Vasileios, Kakaboura Afrodite
Int J Esthet Dent. 2014 Summer;9(2):224-37.
To compare color and translucency changes after light curing and finishing in various shades of five contemporary resin composites.
Light and dark (A1 & A4 or equivalents), enamel (e) and dentin (d), shades were selected from the resin composites Enamel Plus HRi (Micerium), Miris 2 (Coltene), IPS Empress Direct (Ivoclar), Filtek Supreme (3M ESPE) and TPH Spectum (Densply). Ten disc-shaped samples (depth = 10 mm, thickness = 1 mm) per material and shade were fabricated. Three colorimetric readings, over white and black background, according to the CIELab system were taken before and after light polymerization and after finishing with wet carbide papers. Color (ΔE) and translucency (ΔTP) differences were calculated. Results were analyzed by ANOVA, post-hoc Scheffe's test and linear regression analysis.
Polymerization provided a wide range of color change, ranging from 1.36 (Hri/UD1) to 8.07 (Miris/WB). Translucency increased in all groups, except Miris/NT. Translucency change varied from -0.4 (Miris/NT) to 8.88 (Hri/UE3). After finishing, ΔE ranged from 0.58 (Hri/ UD4) to 3.41 (Miris/NT). ΔE was significantly positively correlated with ΔL, Δb after curing and with ΔL, Δa, ΔTP after finishing.
Polymerization caused remarkable color and translucency changes, which were product and shade dependent. Thirteen out of 18 of the tested resin composites exhibited clinically perceptible (ΔE>2.6) color change after light curing and 2 out of 18 after finishing.
Shade matching with non-polymerized resin composite may be erroneous.
比较五种当代树脂复合材料不同色阶在光固化和修整后的颜色及透明度变化。
从树脂复合材料Enamel Plus HRi（Micerium公司）、Miris 2（康特恩公司）、IPS Empress Direct（义获嘉公司）、Filtek Supreme（3M ESPE公司）和TPH Spectum（登士柏公司）中选取浅（A1）和深（A4或等效色阶）、牙釉质（e）和牙本质（d）色阶。每种材料和色阶制作10个圆盘形样本（深度 = 10毫米，厚度 = 1毫米）。在光聚合前后以及用湿碳化钨纸修整后，根据CIELab系统在白色和黑色背景上进行三次比色读数。计算颜色（ΔE）和透明度（ΔTP）差异。结果通过方差分析、事后谢费检验和线性回归分析进行分析。
聚合导致颜色变化范围广泛，从1.36（Hri/UD1）到8.07（Miris/WB）。除Miris/NT组外，所有组的透明度均增加。透明度变化范围从 -0.4（Miris/NT）到8.88（Hri/UE3）。修整后，ΔE范围从0.58（Hri/UD4）到3.41（Miris/NT）。ΔE在固化后与ΔL、Δb显著正相关，在修整后与ΔL、Δa、ΔTP显著正相关。
聚合引起显著的颜色和透明度变化，这取决于产品和色阶。18种测试树脂复合材料中有13种在光固化后出现临床可察觉的（ΔE>2.6）颜色变化，18种中有2种在修整后出现这种情况。
与未聚合的树脂复合材料进行比色可能会出现误差。
