O'Brien W J, Hemmendinger H, Boenke K M, Linger J B, Groh C L
University of Michigan, Ann Arbor, USA.
Dent Mater. 1997 May;13(3):179-85. doi: 10.1016/S0109-5641(97)80121-2.
Knowledge of human tooth color and its distribution are critical to the understanding of shade matching in esthetic dentistry. The color of human teeth shows a gradation from the gingival to the incisal region. There have been many reports in the literature on the distribution of color in teeth, but not in the CIE 1976 Lab* system. This study was conducted to determine the color distribution in three regions in a sample of human teeth and express the results in Munsell notation, CIE 1976 Lab* and CIE delta E* color differences. The hypothesis of this research was that it is possible to detect significant differences in the color parameters of the three distinct regions in teeth.
All of the teeth used in this study were extracted, cleaned and stored in artificial saliva. Prior to measurement, the teeth were removed from the solution and mounted in a holder to ensure consistent measurements. Spectral data were collected using a GE recording spectrophotometer, CIE chromaticity coordinates calculated using CIE illuminant C and 1931 observer data, and conversions made to L*, a*, b* and Munsell notation. The results were analyzed by ANOVA and Scheffé's multiple comparisons test.
The mean L*, a*, bs were 72.6, 1.5, 18.4 for gingival, 72.4, 1.2, 16.2 for middle, and 71.4, 0.9, 12.8 for incisal. Average Munsell parameters were 1.2 Y 7.1/2.7 for gingival, 1.3 Y 7.1/2.4 for middle, and 1.4 Y 7.0/1.9 for incisal. The mean CIE delta E between the gingival and incisal regions of the 95 teeth showed a clinically significant difference of 8.2.
The distribution of color was identified for three regions of the tooth. A statistical analysis determined that there are statistically significant color differences between the regions, and these differences are also clinically significant. This information is beneficial when esthetic restorations are required.
了解人类牙齿颜色及其分布对于理解美学牙科中的比色至关重要。人类牙齿的颜色从牙龈区域到切端区域呈现出渐变。文献中有许多关于牙齿颜色分布的报道，但未采用CIE 1976 Lab系统。本研究旨在确定人类牙齿样本中三个区域的颜色分布，并以孟塞尔表示法、CIE 1976 Lab和CIE色差ΔE*来表达结果。本研究的假设是，有可能检测到牙齿三个不同区域颜色参数的显著差异。
本研究中使用的所有牙齿均被拔除、清洁并保存在人工唾液中。在测量之前，将牙齿从溶液中取出并安装在固定器中，以确保测量的一致性。使用GE记录分光光度计收集光谱数据，使用CIE光源C和1931观察者数据计算CIE色度坐标，并转换为L*、a*、b*和孟塞尔表示法。结果通过方差分析和谢弗多重比较检验进行分析。
牙龈区域的平均L*、a*、b值分别为72.6、1.5、18.4，中间区域为72.4、1.2、16.2，切端区域为71.4、0.9、12.8。牙龈区域的平均孟塞尔参数为1.2 Y 7.1/2.7，中间区域为1.3 Y 7.1/2.4，切端区域为1.4 Y 7.0/1.9。95颗牙齿的牙龈区域和切端区域之间的平均CIE色差ΔE显示出临床上显著的差异，为8.2。
确定了牙齿三个区域的颜色分布。统计分析表明，这些区域之间存在统计学上显著的颜色差异，并且这些差异在临床上也具有显著性。当需要进行美学修复时，这些信息是有益的。
