Zhang Feimin, Zhao Yunfeng, Razzoog Michael E
Department of Prosthodontics, Hospital for Stomatology, Nanjing Medical University, Nanjing 210029, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2002 May;37(3):206-9.
To evaluate the resulting color of veneers affected by adding a layer of veneering porcelain on Procera aluminium oxide core.
Fifteen aluminium oxide disks were randomized into three groups. Each of five disks was veneered with porcelain of the Vita shade Al, A2 and B4 respectively. The color of the substrate covered with non-veneered disks and the veneered disks was measured separately and the color differences were calculated.
Statistically significant differences (P < 0.01) in color coordinates of dark substrate were recorded between the substrate covered by an aluminium oxide disks and the addition of veneering porcelain to aluminium oxide disks. Mean coordinates color difference (DeltaE, DeltaL *, Deltaa *, Deltab *) after adding the three shades of veneering porcelain showed increase from Al (2.311) to A2 (4.313) to B4 (8.778) in DeltaE, decrease from Al (-1.530) to A2 (-3.369) and B4 (-3.358) in DeltaL *, and increase from Al (-1.440) to A2 (2.198) to B4 (7.955) in Deltab *. The direction of the color modification correlated with values obtained from the liberation. The resulting color was also affected by the color of the underlying structure.
This study illustrates that color of aluminium oxide shell could be modified with feldspathic veneering porcelain, which may be used by practitioners to alter the esthetic outcome of porcelain veneers.
评估在Procera氧化铝核上添加一层饰面瓷后贴面的最终颜色。
将15个氧化铝盘随机分为三组。五个盘分别用Vita色号Al、A2和B4的瓷进行贴面。分别测量未贴面盘和贴面盘覆盖的基底的颜色，并计算颜色差异。
记录到氧化铝盘覆盖的基底与在氧化铝盘上添加饰面瓷后深色基底颜色坐标的统计学显著差异（P < 0.01）。添加三种饰面瓷色号后的平均颜色坐标差异（ΔE、ΔL*、Δa*、Δb*）显示，ΔE从Al（2.311）增加到A2（4.313）再到B4（8.778），ΔL从Al（-1.530）减少到A2（-3.369）和B4（-3.358），Δb从Al（-1.440）增加到A2（2.198）再到B4（7.955）。颜色改变的方向与从明度获得的值相关。最终颜色也受底层结构颜色的影响。
本研究表明，长石质饰面瓷可改变氧化铝壳的颜色，从业者可利用这一点改变瓷贴面的美学效果。
