Department of Restorative Sciences, Division of Prosthodontics, University of Minnesota, Minneapolis, MN, United States.
Prosthodontic Unit, Department of Restorative Dentistry, National Dental Center Singapore, Singapore; Oral Health Academic Clinical Programme, Duke-NUS Medical School, Singapore.
J Dent. 2022 Oct;125:104223. doi: 10.1016/j.jdent.2022.104223. Epub 2022 Jul 15.
There are several shade matching instruments developed for clinical use, but the validity of their use in dental research has not been thoroughly investigated. The objective of this study is to evaluate the accuracy of using two clinical color measuring instruments, VitaEasyshade and Spectroshade, against a referent laboratory color measuring instrument (Spectroradiometer PR670).
The validity and repeatability of the referent laboratory color measuring instrument was assessed using standard color patches with certified CIE Lab* values. 10% of the 240 color patches were randomly selected and measured ten times in a random order to test for repeatability. 16 metal ceramic specimens, fabricated from base metal alloy veneered with porcelain of different Vita Classic shades, were measured for Lab* values using the PR670, Vita EasyShade and the Spectroshade. The CIE Lab* values obtained from the three color measuring instruments were compared using repeated measures ANOVA and post hoc using the Bonferroni test. The color difference, CIEDE2000 (∆E), between the gold standard (PR670) and the two color measuring instruments were also determined and compared against the known perceptible color difference.
Lab* values varied significantly between the three instruments. When comparing the mean ΔE, the differences in values between PR670 and Spectroshade were not clinically significantly. However, the mean ΔE values between PR670 and Vita Easyshade were both clinically and statistically significant.
The lack of clinical significance in values obtained from the SpectroShade when compared to those obtained by the PR670 suggests that the SpectroShade may be recommended for use in dental color research.
The SpectroShade instrument and PR670 spectroradiometer provided values that lacked clinical significance, suggesting that its use may be highly beneficial for clinical shade matching as well as color research.
目前已经开发出几种用于临床的比色仪器，但它们在口腔医学研究中的有效性尚未得到充分研究。本研究的目的是评估两种临床比色仪器（Vita Easyshade 和 Spectroshade）与参考实验室比色仪器（分光光度计 PR670）的准确性。
使用具有认证 CIE Lab值的标准比色片评估参考实验室比色仪器的准确性和可重复性。随机选择 240 个比色片中的 10%，并以随机顺序测量十次以测试可重复性。使用 PR670、Vita Easyshade 和 Spectroshade 测量由贱金属合金制成的 16 个金属陶瓷标本，其表面覆盖有不同 Vita Classic 色调的瓷层，测量 Lab值。使用重复测量 ANOVA 比较三种比色仪获得的 CIE Lab*值，并用 Bonferroni 检验进行事后比较。还确定了两种比色仪与金标准（PR670）之间的颜色差异（CIEDE2000（∆E）），并与已知的可察觉颜色差异进行比较。
三种仪器之间的 Lab*值存在显着差异。当比较平均ΔE 时，PR670 和 Spectroshade 之间的数值差异在临床上并不显着。然而，PR670 和 Vita Easyshade 之间的平均ΔE 值在临床上和统计学上均有显着差异。
与 PR670 相比，SpectroShade 获得的数值在临床上无显着差异，表明 SpectroShade 可用于口腔医学颜色研究。
SpectroShade 仪器和 PR670 分光光度计提供的数值在临床上没有显着意义，这表明它的使用可能对临床比色匹配以及颜色研究非常有益。
