|
Sign In to gain access to subscriptions and/or personal tools.
|
A New, Small-color-difference Equation for Dental Shades
W.J. O'Brien
The Department of Biologic and Materials Sciences, School of Dentistry, The University of Michigan, Ann Arbor, Michigan 48109-1078
C.L. Groh
The Department of Biologic and Materials Sciences, School of Dentistry, The University of Michigan, Ann Arbor, Michigan 48109-1078
K.M. Boenke
The Department of Biologic and Materials Sciences, School of Dentistry, The University of Michigan, Ann Arbor, Michigan 48109-1078
Traditionally, dental-shade-guide standards are designated in terms of Munsell hue (H), value (V), and chroma (C). However,  E color differences proposed as ADA tolerances for shade guides are in the CIE L*a*b* system. The purpose of this study was to evaluate a new color-difference equation, for estimation of small color differences by Munsell parameters. The published values of the Bioform shade-guide tooth colors determined with a Beckman spectrophotometer were used. Color differences among 276 combinations of the 24 Bioform shade-guide colors were calculated with Eq. 1, with use of the Munsell notation, and also with the CIE L*a*b* equation for E. An estimate of the accuracy of Eq. 1 was 0.41 E units when E CIE was below 4.0. The Vita shade-guide colors were determined with a Beckman spectrophotometer. This data set contained 16 samples, and 120 combinations were used for calculation of color difference. An estimate of the accuracy for this set of data was 0.35 E units when E CIE was less than 4.0. The new color-difference equation provides a means for estimation of AE CIE L*a*b* color difference between dental shades with Munsell notation. This equation will be useful for estimation of small AE CIE L*a*b* values for shade-guide teeth that are designated in terms of Munsell notation.
REFERENCES
- ASTM Standard D 1535-80 (1984): Standard Method of Specifying Color by the Munsell System. In: ASTM Standards on Color and Appearance Measurement, Philadelphia, pp. 28-50.
- Balinkin, LA (1941): Measurement and Designation of Small Color Differences, Am Ceram Soc Bull 20:392-402.
- CIE (1978): Recommendations on Uniform Color Spaces. Color-difference Equations. Psychometric Color Terms. Supplement No. 2 to CIE Publication No. 15 (E-13.1)1971/(TC-1.3), Paris: Bureau Central de la CIE.
- Godlove, I.H. (1951): Improved Color-difference Formula, with Applications to Perceptibility and Acceptability of Fadings, J Opt Soc Am 41:760-772.
- Johnston, W.M. and Kao, E.C. (1989): Assessment of Appearance Match by Visual Observation and Clinical Colorimetry, J Dent Res 68:819-822.[Abstract/Free Full Text]
- Nickerson, D. (1936): The Specification of Color Tolerances, Textile Res 6:505-514.
- O'Brien, W.J.; Groh, C.L.; and Boenke, K.M. (1989): A One-dimensional Color Order System for Dental Shade Guides, Dent Mater 5:371-374.[Medline]
[Order article via Infotrieve]
- Rafferty, J.; Norling, R.; McMath, C.; Tamaru, R.; and Morganstein, D. (1985): Statworks, Version 1.1, Philadelphia: Cricket Software, Inc.
- Sproull, R.C. (1973): Color Matching in Dentistry. Part I. The Three-dimensional Nature of Color, J Prosthet Dent 29:416-424.[CrossRef][Medline]
[Order article via Infotrieve]
- Wozniak, W.T. (1987): Proposed Guidelines for the Acceptance Program for Dental Shade Guides, Chicago: American Dental Association, pp. 1-2.
Journal of Dental Research, Vol. 69, No. 11,
1762-1764 (1990)
DOI: 10.1177/00220345900690111001
 CiteULike  Complore  Connotea  Del.icio.us  Digg  Reddit  Technorati  Twitter What's this?
This article has been cited by other articles:
|
|
|
|
 
S.A. Nathoo and A. Gaffar
Studies on Dental Stains Induced by Antibacterial Agents and Rational Approaches for Bleaching Dental Stains
Advances in Dental Research,
December 1, 1995;
9(4):
462 - 470.
[Abstract]
[PDF]
|
|
|
|
|
|
|
J.J. ten Bosch and J.C. Coops
Tooth Color and Reflectance as Related to Light Scattering and Enamel Hardness
Journal of Dental Research,
January 1, 1995;
74(1):
374 - 380.
[Abstract]
[PDF]
|
|
|
|
|
