Yi Yuan-fu, Wang Chen, Tian Jie-mo, Liu Hong-chen, Wen Ning
Dept. of Stomatology, The General Hospital of Chinese People's Armed Police Forces, Beijing, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2008 Oct;26(5):556-9.
To obtain and investigate the chromaticity properties of colored dental 3Y-TZP ceramics with different colorant combinations.
Colorant combinations were mixed with TZ-3Y-S powder, then the mixtures were compacted at 200 MPa using cold isostatic pressure, densely sintered at 1500 degrees C for 2 h forming 5 graded colored dental zirconia ceramics. Specimen were sectioned into 10 mm x 10 mm x 0.5 mm and 10 mm x l0 mmx 1 mm slices from the sintered blocks. Color measurement was performed under black background using spectrophotometer. The chromaticity properties were compared with that of the VITA In-Ceram YZ shade guide.
Five colored dental zirconia ceramics were obtained. The lightness decreased gradually, and the chroma value increased gradually. The color differences of the two thickness specimens were little. The parameters of the color space were L*: 67.76-77.78; a*: -2.19-3.80; b*: 12.13-25.01, which was similar with that of the VITA In-Ceram YZ shade guide, while the lowest value of lightness was relatively higher than that of the VITA In-Ceram YZ shade guide.
Colored 3Y-TZP dental ceramics are suitable for clinical use. There is a need to develop more darkness shaded zirconia dental ceramics.
获取并研究不同着色剂组合的彩色牙科3Y-TZP陶瓷的色度特性。
将着色剂组合与TZ-3Y-S粉末混合，然后使用冷等静压在200MPa下压制成型，在1500℃下致密烧结2小时，形成5种梯度颜色的牙科氧化锆陶瓷。将烧结块切割成10mm×10mm×0.5mm和10mm×10mm×1mm的薄片。使用分光光度计在黑色背景下进行颜色测量。将色度特性与VITA In-Ceram YZ比色板进行比较。
获得了5种彩色牙科氧化锆陶瓷。明度逐渐降低，色度值逐渐增加。两种厚度试样的颜色差异很小。颜色空间参数为L*：67.76 - 77.78；a*：-2.19 - 3.80；b*：12.13 - 25.01，与VITA In-Ceram YZ比色板相似，而最低明度值相对高于VITA In-Ceram YZ比色板。
彩色3Y-TZP牙科陶瓷适用于临床使用。需要开发更多深色系的氧化锆牙科陶瓷。
