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- 2015
应用分光光度仪比较深度变色基牙表面4种全瓷冠色度学特征
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Abstract:
摘要 目的:采用分光光度比色仪评估深度变色ND8基底表面4种全瓷冠各部分色度学参数CIE L*a*b*值及与目标色片色差。方法:制作ND8色基牙预备体,分别戴入Procera氧化铝、Procera氧化锆、Lava氧化锆、IPS E.max高度不透明压铸陶瓷底冠,分光光度仪对颈部、体部、切端测色。4组底冠经烧结A2体瓷后戴入基底(总瓷层厚度控制1.5 mm),分光光度仪同法测色,以Vitapan比色板A2体瓷色片为对照,对数据进行单因素方差分析、均数比较Bonferroni检验,计算P值。结果:4组底冠均提高基牙的L*值,降低彩度a*、b*值,多数组间各部位L*、a*、b*有统计学差异。烧结体瓷后,各组L*略下降,a*、b*明显上升。各部分与A2色差显著减小(1.45∽3.70)。结论:4组全瓷底冠对变色基底都有较好遮色性,但各组底冠明度、彩度不一致。烧结体瓷后颜色有差异的组别减少,各组与目标色片差别在临床可接受范围
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