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Lightness, chroma and hue differences on visual shade matching.

Oscar E Pecho1, María M Pérez2, Razvan Ghinea2

  • 1Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva, Edificio Mecenas, s/n, 18071 Granada, Spain; Post-Graduate Program in Dentistry, Dental School, University of Passo Fundo, Brazil.

Dental Materials : Official Publication of the Academy of Dental Materials
|September 12, 2016
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Summary

Dental students performing shade matching prioritized lower chroma and hue over lightness. This preference influences visual perception and explains discrepancies in dental shade selection.

Keywords:
CIELABColor perceptionDentistryShade matchingSubjective evaluation

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Area of Science:

  • Dental Materials Science
  • Color Science
  • Visual Perception

Background:

  • Accurate dental shade matching is crucial for aesthetic restorations.
  • Discrepancies exist between visual and instrumental shade matching.
  • Limitations of current shade guides impact clinical outcomes.

Purpose of the Study:

  • To analyze how lightness, chroma, and hue differences influence visual shade matching by dental students.
  • To investigate the perceptual drivers behind shade selection in dentistry.
  • To contribute to understanding the limitations of dental shade guides.

Main Methods:

  • Spectroradiometry was used to measure the spectral reflectance of human teeth and shade tabs.
  • Color parameters (L*, a*, b*, C*, h°) were calculated.
  • CIE color difference metrics, including CIEDE2000 (lightness, chroma, hue), were computed for visual matches made by 100 dental students.

Main Results:

  • Dental students preferred shades with lower chroma and hue differences over those with lower lightness differences.
  • Most visually selected shades were found within the tolerance ellipsoid of the target tooth shade.
  • Visual shade matching was predominantly driven by chroma and hue perception.

Conclusions:

  • Visual shade matching is influenced by a preference for lower chroma and hue values.
  • These findings help explain inconsistencies between visual and instrumental shade matching.
  • The study highlights the perceptual biases in visual shade selection and limitations of shade guides.