Key Laboratory for Oral Biomedical Engineering of Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China.
J Oral Rehabil. 2009 Jan;36(1):65-70. doi: 10.1111/j.1365-2842.2008.01894.x. Epub 2008 Oct 22.
The purpose of this study was to evaluate the colour errors of visual shade selection by five different shade guides. The maxillary left central incisors of sixty participants were visually evaluated by two groups of prosthodontists, with different clinical experience. The shade selection results were recorded and the most selected tab was determined as the resultant shade for each tooth. If totally different opinions were obtained, consensus was needed to determine the resultant shade among the observers. The colour distributions (L*, a* and b*) of each tooth and shade tab were measured using a spectroradiometer. The coverage errors (CEs) of each shade guide and colour differences (DeltaE values) between a tooth and the selected shade tabs were calculated. Two-way anova and Tukey's post hoc analysis were used to evaluate the differences of CE and DeltaE values among shade guides and clinical experience (alpha = 0.05). Coverage errors and DeltaE values in all of the five shade guide systems were all beyond the clinical threshold of 3.3 units. The consensus led to a better colour matching than that of the single decision group in Vitapan 3D-Master and Shofu NCC shade guides. A significant difference (P < 0.001) was found among DeltaE values of the shade guide system and clinical experience. In conclusion, all five of the shade guide systems used did not achieve clinically compatible shade matching. However, the Vitapan 3D Master shade guide system resulted in the lowest CEs and DeltaE values. Consensus could be helpful in enhancing the aesthetic results using Vitapan 3D Master and Shofu NCC shade guides.
本研究旨在评估五种不同比色指南在视觉比色选择中的颜色误差。将 60 名参与者的上颌左侧中切牙由两组具有不同临床经验的修复科医生进行肉眼评估。记录比色选择结果，并将最常选择的色标确定为每个牙齿的比色结果。如果获得完全不同的意见，则需要观察者之间达成共识来确定比色结果。使用分光光度计测量每个牙齿和比色片的颜色分布（L*、a和 b）。计算每个比色指南的覆盖误差（CE）和牙齿与所选比色片之间的颜色差异（DeltaE 值）。使用双向方差分析和 Tukey 事后分析评估比色指南和临床经验之间的 CE 和 DeltaE 值差异（alpha = 0.05）。所有五种比色指南系统的 CE 和 DeltaE 值均超过 3.3 个单位的临床阈值。共识比 Vitapan 3D-Master 和 Shofu NCC 比色指南的单个决策组的颜色匹配更好。比色指南系统和临床经验的 DeltaE 值之间存在显著差异（P < 0.001）。总之，使用的五种比色指南系统均未实现临床兼容的比色匹配。然而，Vitapan 3D Master 比色指南系统导致的 CE 和 DeltaE 值最低。共识可以有助于增强使用 Vitapan 3D Master 和 Shofu NCC 比色指南的美学效果。
