牙科着色氧化钇稳定四方多晶氧化锆陶瓷的制备及颜色性能

目的添加不同着色剂组合配制着色的牙科氧化钇稳定四方多晶氧化锆（3Y-TZP）陶瓷，并测定其颜色性能。方法将TZ-3Y-S粉体与一定组分的着色剂球磨混合后，在200 MPa压力下等静压成型，在1 500 ℃烧结2 h，烧制5种具有一定颜色的氧化锆材料，每个颜色组分别制备10 mm×10 mm×0.5 mm和10 mm×10 mm×1 mm着色氧化锆陶瓷片，在黑色背景下用柯尼卡美能达CM-2600d分光光度计进行颜色测定，并与VITA In-Ceram YZ染色液比色板颜色作比较。结果通过对粉体进行着色，配制出具有一定颜色的本体着色氧化锆陶瓷材料，颜色明度逐级降低，饱和度逐渐增大，2种厚度3Y-TZP陶瓷的颜色片色差较小，颜色空间范围是L*：67.76～77.78；a*：-2.19～3.80；b*：12.13～25.01。与VITA In-Ceram YZ染色液比色板相比，颜色空间近似，但明度的最低值仍较高。结论着色氧化锆陶瓷材料适宜用于临床上与饰面瓷颜色匹配，有必要再进一步研究低明度的着色氧化锆色片。

Preparation and chromaticity properties of colored dental 3Y-TZP ceramics

Objective To obtain and investigate the chromaticity properties of colored dental 3Y-TZP ceramics with different colorant combinations. Methods Colorant combinations were mixed with TZ-3Y-S powder, then the mixtures were compacted at 200 MPa using cold isostatic pressure, densely sintered at 1 500 ℃ for 2 h forming 5 graded colored dental zirconia ceramics. Specimen were sectioned into 10 mm×10 mm×0.5 mm and 10 mm×10 mm× 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. Results 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. Conclusion Colored 3Y-TZP dental ceramics are suitable for clinical use. There is a need to develop more darkness shaded zirconia dental ceramics.