Statement of problem
The natural tooth color space reported by a manufacturer may not represent the comprehensive
spectrum of natural teeth for all population groups.
Purpose
The purpose of this study was to define a natural tooth color space within the Greater
Buffalo, New York population and to compare that to the color space determined by
a manufacturer.
Material and methods
Nine hundred and thirty-three maxillary central incisors (501 patients) were measured
with a shade-taking device (Vita Easyshade). For each tooth, L*, a*, b* values, chroma,
hue, and the closest shade (Vita 3D-Master) were recorded. A linear regression analysis
was performed to determine how well the manufacturer's values predict actual values
for L*, a*, and b*. Color differences (ΔE*) between the Buffalo population and the
closest shade were also calculated. A 1-sample t test was used to determine whether the color differences seen in the sample were
statistically different from the perceptibility threshold, ΔE*=3.7 (a=.05).
Results
All 3 attributes of the Buffalo population displayed a broader range than those from
the shade guide. However, the regression analysis revealed a significantly positive
relationship between the L*, a*, and b* values of the 2 methods (P<.001). The 1-sample t test revealed a significant ΔE* (mean ΔE*=6.15) difference
from the perceptibility threshold of ΔE*=3.7 (P<.001).
Conclusions
Color differences between the Buffalo population and the shade guide were frequently
above published perceptibility thresholds, but within the range of acceptability.
The Buffalo population tooth color space encompassed the manufacturer's color space.
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Article info
Footnotes
This project was supported in part by Grant R15 EY013527 from the National Eye Institute of the National Institutes of Health and an American Academy of Fixed Prosthodontics 2003 Tylman Research Grant.
Identification
Copyright
© 2007 The Editorial Council of the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
