Elsevier

Dental Materials

Volume 5, Issue 6, November 1989, Pages 371-374
Dental Materials

A one-dimensional color order system for dental shade guides

https://doi.org/10.1016/0109-5641(89)90102-4Get rights and content

Abstract

The purpose of this study was to re-arrange the master Bioform shade guide into a long-range one-dimensional color system based upon color difference. Although most shade guides may show local order when arranged according to hue, long-range order has not been established. However, shade guide arrangement according to a logical color order would be an advantage to the user. The first step in determining the color order was to measure the color of the shade guide teeth. A methodology was developed for measuring the color by use of a reflectance spectrophotometer. The precision of measurement was determined to be equal to CIE Lab ΔE of 0.5. Spectra were obtained and converted into CIE Lab and Munsell notation. The measured colors of the Bioform shades ranged from a Munsell hue of 0.9 Y to 3.5 Y; a value of 6.6 to 7.8; and a chroma of 1.9 to 4.1. The teeth were then arranged visually from light to dark. The correlation coefficient between the visual ranking and color difference was 0.95. There was an inverse correlation between visual ranking and Munsell value, with a correlation coefficient of 0.90. Therefore, the sequence according to color difference provided the better agreement with visual perception.

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This investigation was supported in part by USPHS Research Grant DE05423 from the National Institute of Dental Research, National Institutes of Health, Bethesda, MD 20892.

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