Investigation of the perceptual thresholds of tooth whiteness.
Investigation of the perceptual thresholds of tooth whiteness.
复制标题
牙齿白度知觉阈值的研究
DOI：
10.1016/j.jdent.2017.09.013
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发表时间：
2017-12
影响因子：
4.4
通讯作者：
S. Westland;W. Luo;Yuan Li;Q. Pan;A. Joiner
中科院分区：
文献类型：
--
作者：
S. Westland;W. Luo;Yuan Li;Q. Pan;A. Joiner
目的调查的牙齿白度感知阈值的平均观察者的CIELAB值的变化和优化的白度指数牙科（WIO）的基础上psychophysical studies.MethodsA心理物理学实验的基础上的视觉评估的数字图像的牙齿上校准的显示器与一组观察员（n = 32）进行了确定的感知阈值牙齿白度。将与牙齿图像中的左切牙形状相同的牙齿的数字模拟叠加到图像上。模拟牙齿的颜色是不同的，观察者被要求回答左切牙和模拟牙齿之间的白度是否有差异。在四种条件下独立地确定用于检测白度差异的阈值：ΔL*、Δa*、ΔB* 和蓝色光学增白方向。结果ΔL*、Δa*、ΔB* 和蓝协方差光学牙齿美白方向4种条件下的阈值估计值分别为1.14、3.24、1.11和1.51，相应的WIO阈值分别为2.77、6.52、6.53和1.54。结论确定了CIELAB空间和WIO空间的牙齿白度感知阈值。研究结果表明，使用蓝色covarine光学技术进行美白治疗，约2 WIO单位的颜色变化将是noticeed.Clinical significanceThis研究提供了一个更好地了解牙齿白度感知阈值，并将帮助临床医生识别在匹配和美白过程中牙齿颜色的可感知差异。
ObjectiveTo investigate the tooth whiteness perceptibility thresholds of the average observer to changes in the CIELAB values and an optimised whiteness Index for dentistry (WIO) based on psychophysical studies.MethodsA psychophysical experiment based on visual assessments of digital images of teeth on a calibrated display with a group of observers (n = 32) has been conducted to determine the perceptual thresholds in tooth whiteness. Digital simulations of a tooth that is identical in shape to the left incisor in the image of teeth were superimposed on to images. The colour of the simulated tooth was varied and observers were asked to respond whether there was a difference in whiteness between the left incisor and the simulated tooth. Thresholds for detection of differences in whiteness were independently determined in four conditions: ΔL*, Δa*, Δb* and a blue optical whitening direction. Raw data were fitted using a non-parametric approach and thresholds of CIELAB and WIO for each conditions were calculated.ResultsEstimates of the threshold of the four conditions of ΔL*, Δa*, Δb* and a blue covarine optical tooth whitening direction were 1.14, 3.24, 1.11 and 1.51 respectively, with the corresponding WIO thresholds of 2.77, 6.52, 3.09 and 1.99 respectively.ConclusionsThe thresholds for tooth whiteness perception in CIELAB space and WIO space were determined. The findings demonstrate that for a whitening treatment with a blue covarine optical technology, a colour change of about 2 WIO units would be noticeable.Clinical significanceThis study gives a better understanding of the tooth whiteness perception threshold, and will help clinicians identify perceivable differences in tooth colour during matching and whitening procedures.