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Repeatability and reliability of human eye in visual shade selection.

P B Özat1, İ Tuncel, E Eroğlu

  • 1Keçiborlu State Hospital, Isparta, Keçiborlu, Turkey.

Journal of Oral Rehabilitation
|October 17, 2013
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Summary

Dentists show poor repeatability in visual shade matching, with only 11.1% accuracy. However, they can still select clinically acceptable shades for dental restorations.

Keywords:
reliabilityrepeatabilityvisual shade selection

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Area of Science:

  • Dentistry
  • Visual Perception
  • Color Science

Background:

  • Visual shade matching is crucial in dentistry but faces challenges due to human visual perception limitations.
  • The efficiency and accuracy of visual shade selection protocols are frequently questioned.

Purpose of the Study:

  • To evaluate the repeatability and reliability of the human eye in visual shade selection among dentists.
  • To assess the consistency of shade matching over a one-month period.

Main Methods:

  • Fifty-four dentists participated, matching the shade of a single maxillary central incisor using the Vita 3D-Master shade guide.
  • Shade tab codes were concealed, and tabs were randomized before each trial.
  • The procedure was repeated after one month to assess repeatability.
  • Quantitative analysis used L*, a*, b* values measured by a dental spectrophotometer (Vita Easyshade).

Main Results:

  • A statistically significant difference (P < 0.001) was found in qualitative repeatability (yes/no), with only 11.1% consistency.
  • No statistically significant differences were observed in quantitative measurements (L*, a*, b*, ΔE) between the two sessions (P = 0.000).

Conclusions:

  • Dentists exhibit insufficient repeatability in visual shade matching, indicating a need for improved protocols.
  • Despite low repeatability, dentists can still achieve clinically acceptable shade selections.