基于视频的数字成像系统用于牙齿颜色测量的体外和体内重现性。

The in vitro and in vivo reproducibility of a video-based digital imaging system for tooth colour measurement.

机构信息

Unilever Oral Care, Quarry Road East, Bebington, Wirral, CH63 3JW, UK.

出版信息

J Dent. 2017 Dec;67S:S15-S19. doi: 10.1016/j.jdent.2017.09.012.

DOI:10.1016/j.jdent.2017.09.012

PMID:29233259

Abstract

OBJECTIVES

To assess the robustness of a new custom built video-based digital imaging system (VDIS) for measuring tooth colour and whiteness under in vitro and in vivo conditions.

METHODS

The VDIS imaging system was developed for tooth colour measurement and evaluated in vitro and in vivo. The in vitro validation used extracted human teeth (HT, n=14) stored in water and VITA Classical shade guide tabs (SG, n=16). These were measured by the VDIS at baseline, 5min, 2h, 1 week and 2 weeks to evaluate the system repeatability. For in vivo validation, adult volunteers (male/female, n=34) with two natural, unrestored central incisors had their teeth imaged using the VDIS at baseline, 5min and 2h (3 images each) by two different operators to evaluate time and operator effects. Between taking individual images, subjects moved from the imaging-frame to assess the effect of re-positioning on reproducibility. From the in vitro and in vivo images, the average tooth RGB values were obtained, and the CIELAB values and a tooth whiteness index WIO value were calculated. Repeatability and reproducibility of VDIS imaging system was assessed using appropriate repeated measurement analysis techniques and ANOVA.

RESULTS

The measurement variations in vitro were between 1 and 2 units of ΔWIO and the average colour differences were less than 1 ΔE unit. For the in vivo study, analysis of the CIELAB parameters and WIO showed that subject variability accounted for between 82 and 99% of the observed variability in the measurement process. The operator variability was less than 0.5% and the overall measurement error was found to be only 0.3% for WIO. Across assessment times the variability was less than 0.5%.

CONCLUSIONS

The dental imaging system V-DIS was shown to be a highly reproducible means for tooth colour and whiteness measurement.

CLINICAL SIGNIFICANCE

Digital imaging based techniques gives a highly reproducible approach to measuring tooth colour.

摘要

目的

评估一种新的定制基于视频的数字成像系统（VDIS）在体外和体内条件下测量牙齿颜色和白度的稳健性。

方法

VDIS 成像系统是专为牙齿颜色测量而开发的，并在体外和体内进行了评估。体外验证使用储存在水中的人类牙齿（HT，n=14）和 VITA 经典比色指南标签（SG，n=16）。在基线、5 分钟、2 小时、1 周和 2 周时使用 VDIS 对其进行测量，以评估系统的重复性。对于体内验证，两名具有两颗天然、未经修复的中切牙的成年志愿者（男/女，n=34）由两名不同的操作人员使用 VDIS 在基线、5 分钟和 2 小时（每次拍摄 3 张图像）对其牙齿进行成像，以评估时间和操作人员的影响。在拍摄个体图像之间，受检者从成像框移动以评估重新定位对可重复性的影响。从体外和体内图像中，获得了平均牙齿 RGB 值，并计算了 CIELAB 值和牙齿美白指数 WIO 值。使用适当的重复测量分析技术和 ANOVA 评估了 VDIS 成像系统的重复性和可重复性。

结果

体外测量的变化幅度在 1 到 2 个 ΔWIO 单位之间，平均颜色差异小于 1 ΔE 单位。对于体内研究，CIELAB 参数和 WIO 的分析表明，受试者变异性占测量过程中观察到的变异性的 82%至 99%。操作人员的变异性小于 0.5%，而 WIO 的总体测量误差仅为 0.3%。在整个评估时间内，变异性小于 0.5%。