Azer Shereen S, Ayash Ghada M, Johnston William M, Khalil Moustafa F, Rosenstiel Stephen F
Section of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Columbus, Ohio 3218-2357, USA.
J Prosthet Dent. 2006 Dec;96(6):397-401. doi: 10.1016/j.prosdent.2006.09.020.
Clinically relevant assessment of all-ceramic crowns supported by esthetic composite resin foundations has not been evaluated with regard to color reproducibility.
This in vitro study quantitatively evaluated the influence of different shades of composite resin foundations and resin cement on the final color of a leucite-reinforced all-ceramic material.
A total of 128 disks were fabricated; 64 (20 x 1 mm) were made of all-ceramic material (IPS Empress) and 64 (20 x 4 mm) of 4 different shades composite resin (Tetric Ceram). The ceramic and composite resin disks were luted using 2 shades (A3 and Transparent) of resin cement (Variolink II). Color was measured using a colorimeter configured with a diffuse illumination/0-degree viewing geometry, and Commission Internationale de l'Eclairage (CIE) L( *)a( *)b( *) values were directly calculated. Descriptive statistical analysis was performed, and color differences (DeltaE) for the average L( *), a( *) and b( *) color parameters were calculated. Repeated measures analysis of variance (ANOVA) was used to compare mean values and SDs between the different color combinations (alpha=.05).
The CIE L( *)a( *)b( *) color coordinate values showed no significant differences for variation in color parameters due to the effect of the different composite resin shades (P=.24) or cement shades (P=.12). The mean color difference (DeltaE) value between the groups was 0.8.
Within the limitations of this study, the use of different shades for composite resin cores and resin cements presented no statistically significant effect on the final color of IPS Empress all-ceramic material.
关于由美学复合树脂基底支持的全瓷冠的临床相关评估，尚未就颜色再现性进行评估。
本体外研究定量评估了不同色度的复合树脂基底和树脂水门汀对白榴石增强全瓷材料最终颜色的影响。
共制作了128个圆盘；64个（20×1mm）由全瓷材料（IPS Empress）制成，64个（20×4mm）由4种不同色度的复合树脂（Tetric Ceram）制成。陶瓷圆盘和复合树脂圆盘使用2种色度（A3和透明）的树脂水门汀（Variolink II）粘结。使用配置有漫射照明/0度观察几何结构的色度计测量颜色，并直接计算国际照明委员会（CIE）L（）a（）b（）值。进行描述性统计分析，并计算平均L（）、a（）和b（）颜色参数的颜色差异（ΔE）。采用重复测量方差分析（ANOVA）比较不同颜色组合之间的平均值和标准差（α=0.05）。
由于不同复合树脂色度（P=0.24）或水门汀色度（P=0.12）的影响，CIE L（）a（）b（*）颜色坐标值在颜色参数变化方面无显著差异。各组之间的平均颜色差异（ΔE）值为0.8。
在本研究的局限性内，复合树脂核和树脂水门汀使用不同色度对IPS Empress全瓷材料的最终颜色没有统计学上的显著影响。
