Faculty of Dentistry, Department of Prosthetic Dentistry, Başkent University, Ankara, Turkey.
Clin Oral Investig. 2010 Dec;14(6):713-8. doi: 10.1007/s00784-009-0329-6. Epub 2009 Aug 18.
This study evaluated the colour parameters of composite and ceramic shade guides determined using a colorimeter and digital imaging method with illuminants at different colour temperatures. Two different resin composite shade guides, namely Charisma (Heraeus Kulzer) and Premise (Kerr Corporation), and two different ceramic shade guides, Vita Lumin Vacuum (VITA Zahnfabrik) and Noritake (Noritake Co.), were evaluated at three different colour temperatures (2,700 K, 2,700-6,500 K, and 6500 K) of illuminants. Ten shade tabs were selected (A1, A2, A3, A3,5, A4, B1, B2, B3, C2 and C3) from each shade guide. CIE Lab values were obtained using digital imaging and a colorimeter (ShadeEye NCC Dental Chroma Meter, Shofu Inc.). The data were analysed using two-way ANOVA, and Pearson's correlation. While mean L* values of both composite and ceramic shade guides were not affected from the colour temperature, L* values obtained with the colorimeter showed significantly lower values than those of the digital imaging (p < 0.01). At combined 2,700-6500 K colour temperature, the means of a* values obtained from colorimeter and digital imaging did not show significant differences (p > 0.05). For both composite and ceramic shade guides, L* and b* values obtained from colorimeter and digital imaging method presented a high level of correlation. High-level correlations were also acquired for a* values in all shade guides except for the Charisma composite shade guide. Digital imaging method could be an alternative for the colorimeters unless the proper object-camera distance, digital camera settings and suitable illumination conditions could be supplied. However, variations in shade guides, especially for composites, may affect the correlation.
本研究评估了使用比色计和数字成像方法，在不同色温和光源下测定的复合树脂和陶瓷比色指南的颜色参数。评估了两种不同的树脂复合比色指南，即 Charisma（Heraeus Kulzer）和 Premise（Kerr Corporation），以及两种不同的陶瓷比色指南，Vita Lumin Vacuum（VITA Zahnfabrik）和 Noritake（Noritake Co.），在三种不同的光源色温（2,700 K、2,700-6,500 K 和 6500 K）下。从每个比色指南中选择了十个色标（A1、A2、A3、A3.5、A4、B1、B2、B3、C2 和 C3）。使用数字成像和比色计（ShadeEye NCC Dental Chroma Meter，Shofu Inc.）获得 CIE Lab 值。使用双向方差分析和 Pearson 相关分析对数据进行分析。虽然复合和陶瓷比色指南的平均 L值不受色温影响，但比色计获得的 L值明显低于数字成像（p<0.01）。在 2,700-6500 K 组合色温下，比色计和数字成像获得的 a值平均值没有显著差异（p>0.05）。对于复合和陶瓷比色指南，比色计和数字成像方法获得的 L和 b值之间呈现出高度的相关性。除了 Charisma 复合比色指南外，所有比色指南的 a值也获得了高度相关性。除非可以提供适当的物距、数码相机设置和合适的照明条件，否则数字成像方法可以替代比色计。然而，比色指南的变化，尤其是复合材料，可能会影响相关性。
