三种环境光源对于高透分层氧化锆颜色的影响

Effects of Three Illuminants on the Color of High Translucent Multilayered Zirconia

目的研究三种常见环境光源对于四种品牌高透分层氧化锆材料颜色的影响,以对临床操作及修复体制作提供参考,降低由于光源的改变导致的高透分层氧化锆修复体与天然牙颜色失匹配的风险。方法选择四种品牌常用高透分层氧化锆,将其制备为12 mm×10 mm×0.8 mm的方形试样各10个(n=10),分别测量各品牌试样在标准D65光源、A光源及F2光源下的L、a、b值。对同种品牌不同光源及同一光源下不同品牌试样之间的L、a、b值进行统计学分析,并计算同一品牌的试样在不同光源条件下的色差ΔE。结果同一品牌不同光源之间的L值差异无统计学意义;对于a值,A光源>F2光源>D65光源;对于b值,F2光源>D65光源>A光源。在同种光源下,不同品牌试样之间的L、a、b值差异均有统计学意义(P<0.0001)。同一品牌试样在三种不同环境光源条件下存在色差,且均在临床可接受范围内。结论环境光源对于高透分层氧化锆的色调及饱和度均有一定的影响,同一颜色不同品牌高透分层氧化锆修复体间存在色度学上的差异,临床材料选择及修复体制作时需要参考患者生活的光源条件及不同品牌材料的颜色特性,降低由于光源不同而带来的修复体与邻牙颜色失匹配的风险。

Objective To evaluate the effects of three common illuminants on the color of four brands of high translucent multilayered zirconia(HTMZ)ceramics so as to provide reference for clinical practice and dental restoration fabrication,and to reduce the risks for illuminant change causing color mismatch between the natural teeth and the restorations made of HTMZ.Methods Four brands of commonly used HTMZ were selected and ten cuboid samples(n=10/group)of 12 mm×10 mm×0.8 mm were prepared for each type of HTMZ.The L,a,and b values of the samples were measured under D65,A and F2,three standard illuminants.Then,the L,a,and b values were statistically analyzed by using factors of the type of the illuminant and the brand of the zirconia.Color difference(ΔE)of samples of the same brand under exposure to changed illuminants was also calculated.Results When the same samples were exposure to different illuminants,there was no significant difference in the L value,the a value for the different iluminants was shown to be illuminant A>illuminant F2>illuminant D65,and the b value was shown to be illuminant F2>illuminant D65>illuminant A.The L,a,and b values of samples of different brands showed statistically significant difference when they were exposed to the same illuminant(P<0.0001).Samples of the same brand showedΔE when they were under the three different illuninants,and allΔE were clinically acceptable.Conclusion The types of illuminant used,to a certain degree,affected the hue and chroma of HTMZ.There were colorimetric differences between restorations made of different brands of HTMZ ceramics of the same color.The types of illuminants most common to the daily life of patients and the color characteristics of materials of different brands should be taken into consideration to facilitate the selection of restoration materials and dental restoration fabrication,and to reduce the risks for color mismatch between the restorations and the adjacent teeth caused by the change of illuminants.