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Odontology

, Volume 107, Issue 1, pp 72–79 | Cite as

Comparison of two color-difference formulas using the Bland–Altman approach based on gingiva color space

  • Cristina Gómez PoloEmail author
  • Javier Montero
  • Ana Maria Martín Casado
Original Article
  • 72 Downloads

Abstract

The objectives of this study were to determine the relationship between the results provided by the classical CIELab (ΔEab*) and the CIEDE2000 (ΔE00) formulas and the gingival color space using the Bland and Altman limits of agreement, to use this relationship to establish the equivalences between the gingival color thresholds of perceptibility of both formulas, and to evaluate whether the relationship between ΔEab* and ΔE00 is modified depending on the axis in which the changes occur. The means of the L*, a*, and b* coordinates of the 21 gingiva porcelain samples (Heraceram, Heraeus Kulzer Mitsui Chemical Groups) were used and the differences in color were calculated in 210 pairs of samples using the CIELab (ΔE*ab) and CIEDE2000 (ΔE00) color-difference formulas. The results obtained with these formulas were compared and the limits of agreement after a logarithmic transformation of the data were obtained. The relationship between both formulas was ln ΔE00 = − 0.22 + ln ΔEab*. The results obtained with the CIELab formula were between 1.01 (95% confidence interval 0.98–1.03) and 1.54 (95% confidence interval 1.52–1.59) times higher than those obtained with the CIEDE200 formula. In the gingiva color space, the scale factor between the CIEDE2000 and CIELab values changes from 0.63 to 1.02, such that providing an accurate scale factor between both values proves difficult. The pairs with the highest ratio were those where the difference in color was mainly due to changes in lightness, whereas the pairs with the smallest ratio were those where the difference in color was mainly due to changes in the blue–yellow or green–red axes.

Keywords

Gingiva color measurement CIEDE2000 formula CIELAB formula Bland and Altman limits of agreement 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© The Society of The Nippon Dental University 2018

Authors and Affiliations

  • Cristina Gómez Polo
    • 1
    Email author
  • Javier Montero
    • 1
  • Ana Maria Martín Casado
    • 1
  1. 1.School of MedicineUniversity of SalamancaSalamancaSpain

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