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Related Experiment Video

Updated: May 9, 2026

Applying Hyperspectral Reflectance Imaging to Investigate the Palettes and the Techniques of Painters
07:05

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Published on: June 18, 2021

Reliability of Three Image-Based Instrumental Color-Measurement Methods.

Eloah Nunes de Almeida1, Ido Luiz de Azevedo Feiten1, Luis Felipe J Schneider1

  • 1Laboratory for Applied Biotechnology (LABA, UFF), School of Dentistry, Fluminense Federal University, Niterói, Brazil.

Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [Et Al.]
|May 8, 2026
PubMed
Summary

The Optishade colorimeter offers the most precise color measurements for composite resins, while smartphone imaging is unsuitable for accurate quantification despite preserving shade order.

Keywords:
clinical color assessmentcolor measurementcomposite resindigital shade matchinginstrumental colorimetryspectrophotometry

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Area of Science:

  • Dental Materials Science
  • Colorimetry
  • Digital Imaging

Background:

  • Accurate color assessment of dental composites is crucial for aesthetic restorations.
  • Existing clinical methods for color measurement vary in precision.
  • Image-based color assessment tools are increasingly accessible but require validation.

Purpose of the Study:

  • To compare the precision of smartphone imaging, Optishade, and Borea Cobra against a spectrophotometer for measuring composite resin shades.
  • To evaluate CIELAB coordinates and CIEDE2000 (ΔE00) color differences.

Main Methods:

  • Three specimens from eight composite shades were measured using a benchtop spectrophotometer (reference) and three test devices.
  • Agreement for L*, a*, and b* was assessed using linear regression and Bland-Altman analyses.
  • ΔE00 values were analyzed using two-way ANOVA and regression.

Main Results:

  • Optishade demonstrated the closest agreement with the reference, showing minimal bias and narrow limits of agreement.
  • Borea Cobra performed well, with strong agreement for a* and b*, but exhibited greater data dispersion.
  • Smartphone measurements showed systematic bias, reduced precision, and compression of color differences.

Conclusions:

  • Optishade is the most reliable device for quantitative color measurements of composite resins.
  • Borea Cobra offers acceptable performance with certain limitations.
  • Smartphone imaging preserves shade order but is not precise enough for quantitative color analysis.