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A new, small-color-difference equation for dental shades
W J O'Brien1, C L Groh, K M Boenke
1Department of Biologic and Materials Sciences, School of Dentistry, University of Michigan, Ann Arbor 48109-1078.
Journal of Dental Research
|November 1, 1990
Summary
A new color-difference equation using Munsell parameters accurately estimates small color differences in dental shade guides. This method simplifies color matching for dentists and manufacturers using the Munsell notation.
Area of Science:
- Dental materials science
- Colorimetry
- Spectrophotometry
Background:
- Dental shade guides traditionally use Munsell hue (H), value (V), and chroma (C) notations.
- American Dental Association (ADA) tolerances for shade guides utilize the CIE L*a*b* color system for delta E color differences.
Purpose of the Study:
- To evaluate a novel color-difference equation for estimating small color differences using Munsell parameters.
- To assess the accuracy of the equation delta EM = C delta H/5 + 7 delta V + 4 delta C in predicting CIE L*a*b* delta E values.
Main Methods:
- Utilized published Munsell notations of Bioform and Vita shade-guide tooth colors.
- Calculated color differences using the proposed Munsell-based equation and the CIE L*a*b* delta E equation.
- Compared the results from both equations across numerous shade combinations.
Main Results:
- The new Munsell-based equation demonstrated high accuracy, with an estimated error of 0.41 delta E units for Bioform shades (delta E CIE < 4.0).
- For Vita shades, the equation showed an accuracy of 0.35 delta E units (delta E CIE < 4.0).
- The equation effectively estimates CIE L*a*b* delta E values from Munsell notations.
Conclusions:
- The developed color-difference equation provides a reliable method for estimating CIE L*a*b* color differences between dental shades using Munsell notation.
- This equation is valuable for assessing small color variations in shade-guide teeth designated by Munsell parameters.
- Facilitates accurate color matching in dentistry by bridging Munsell and CIE L*a*b* systems.