DDS Izmir Katip Celebi University, Faculty of Dentistry, Department of Prosthodontics, Izmir, Turkey.
J Dent. 2013 Aug;41 Suppl 3:e24-30. doi: 10.1016/j.jdent.2012.11.013. Epub 2012 Nov 29.
Full-ceramic systems can be produced by different techniques (layering, heatpressing, CAD/CAM) and have various compositions with different crystalline contents that may affect the optical properties of laminate restorations.
A total of 60 specimens were prepared from e.max Press, e.max CAD, Empress Esthetic, e.max Ceram, Inline, and ZirPress systems (A1 shade; diameter 10mm; thickness 0.5 ± 0.05mm). The L*, a*, and b* values, chroma and translucency (TP) of each system were recorded before and after ageing. The statistical analyses were performed by ANOVA, Tukey's tests and the paired sample t-test (p<0.05).
The L* value of the shade guide was significantly different from those of the full-ceramic systems; however, there were no significant differences between the a* values of Ceram, Esthetic, Inline and Zirpress. There were significant differences between the b* values of the shade guide compared with the full-ceramics except for e.max Press. The L* values decreased, and the a* and b* values increased after the ageing process for all groups. There were no significant differences between the ΔE values of the ceramic systems (p>0.05). The TP values decreased, and the chroma value increased significantly after the ageing process (p>0.05). The chroma of the shade guide was found to be the highest.
None of the full-ceramic systems was able to match the color of the shade guide. The chemical structures of the ceramic systems were more effective for determining the optical parameters than the fabrication techniques. Ageing caused full-ceramics to become more opaque, darker, reddish and yellowish.
全瓷系统可通过不同技术（分层、热压、CAD/CAM）制作，具有不同的组成，具有不同的结晶含量，可能会影响层压修复体的光学性能。
从 e.max Press、e.max CAD、Empress Esthetic、e.max Ceram、Inline 和 ZirPress 系统（A1 色调；直径 10mm；厚度 0.5±0.05mm）中制备总共 60 个试件。记录每个系统的 L*、a和 b值、彩度和不透明度（TP）在老化前后的值。通过方差分析、Tukey 检验和配对样本 t 检验（p<0.05）进行统计分析。
比色板的 L值与全瓷系统明显不同；然而， Ceram、Esthetic、Inline 和 Zirpress 的 a值之间没有显着差异。与全瓷相比，除了 e.max Press 外，比色板的 b值与全瓷之间存在显着差异。所有组在老化过程后 L值降低，a和 b值增加。陶瓷系统的ΔE 值之间没有显着差异（p>0.05）。TP 值降低，老化后彩度值显着增加（p>0.05）。发现比色板的彩度值最高。
没有一个全瓷系统能够匹配比色板的颜色。陶瓷系统的化学结构比制造技术更能确定光学参数。老化使全瓷变得更不透明、更暗、更红和更黄。
