粘接树脂的色调对白榴石增强玻璃陶瓷色参数的影响

Effect of Luting Composite Shades on the Color Parameters of Leucite-reinforced Glass Ceramic

目的:探讨粘接树脂的色调对白榴石增强玻璃陶瓷色参数的影响。方法:制作28个直径10 mm、厚1 mm的白榴石增强玻璃陶瓷试件(IPS Empress,A2色),实验组在试件表面涂塑厚度为0.2 mm的VariolinkⅡ树脂粘接剂,色调分别为黄、棕和白,各7个;未涂塑树脂粘接剂者为对照组。用PR-650分光光度仪测量各组试件的颜色参数并计算组间色差,对测量的数据进行统计学分析。结果:粘接树脂的色调对IPS Empress铸瓷试件的色参数有显著影响(P<0.05),实验组较对照组的L*值降低,a*、b*值增高;实验组与对照组间及各实验组间的色差有统计学意义(P<0.05)。结论:粘接树脂的色调对白榴石增强玻璃陶瓷色参数有显著影响,临床上粘接白榴石增强玻璃陶瓷修复体时应考虑这一影响。

Objective： To study the influence of luting composite shades on the color parameters of a leucite - reinforced glass ceramic. Methods： Twentyeight specimen disks with 10mm in diameter and 1 mm in thickness were made of the leucite -reinforced glass ceramic （iPS Empress; A2 shade）. The luting composites （Variolink Ⅱ） with 0.2mm thickness and three shades （yellow, brown, or white） were luted to three experiment groups respectively, with seven specimen disks in each group. The control group consisted of seven specimen disks without luting composite. The color parameters L^＊ , a^＊ , and b^＊ of CIELAB color system of the specimens were measured against a white background with a spectrophotometer, and AE values between different groups were calculated. The data was analyzed with one - way ANOVA and the Tukey HSD test （ α = 0.05 ）. Results： The shades of luting composite resulted in decrease of L^＊ （ P 〈 0.05 ） and increase of a^＊ （ P 〈 0.05 ） and b^＊ （ P 〈 0.05 ）, for the experiment groups. AE between different groups showed significant difference. Conclusion ： The luting composite shades have significant effect on the color parameters of leucite - reinforced glass ceramic, which implies the consideration of luting composite selection in the clinic.