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Color difference thresholds for computer-simulated human Gingiva.

María M Pérez1,2, Razvan Ghinea1,2, Luis Javier Herrera3

  • 1Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva, Edificio Mecenas, Granada, s/n 18071, Spain.

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Summary
This summary is machine-generated.

The study established perceptibility and acceptability thresholds for human gingiva color, finding significant differences between them and between color difference formulas. These thresholds aid in dental material evaluation and clinical color assessment.

Keywords:
color differencehuman gingivathresholds

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Area of Science:

  • Dental Science
  • Colorimetry
  • Visual Perception

Background:

  • Accurate color assessment of human gingiva is crucial for esthetic dentistry and material selection.
  • Establishing objective color difference thresholds provides a quantifiable basis for visual evaluations.
  • Previous studies have not fully defined perceptibility and acceptability thresholds for computer-simulated gingiva.

Purpose of the Study:

  • To determine the 50:50% perceptibility threshold (PT) and acceptability threshold (AT) for computer-simulated human gingiva.
  • To compare the performance of CIEDE2000 and CIELAB color difference formulas in evaluating gingival color thresholds.
  • To assess potential differences in thresholds between dentists and laypersons.

Main Methods:

  • Sixty pairs of simulated gingiva were presented on a calibrated monitor to 30 observers (15 dentists, 15 laypersons).
  • Observers compared colors of gingiva adjacent to simulated teeth of varying lightness.
  • CIEDE2000 and CIELAB formulas were used to calculate thresholds, with a Takagi-Sugeno-Kang Fuzzy Approximation model for fitting.

Main Results:

  • The perceptibility threshold (PT) for CIEDE2000 was 1.1 and for CIELAB was 1.7.
  • The acceptability threshold (AT) for CIEDE2000 was 2.8 and for CIELAB was 3.7.
  • Significant differences were found between PT and AT, between the two formulas, and between dentists and laypersons (P < .01).

Conclusions:

  • Statistically significant differences exist between perceptibility and acceptability thresholds for gingiva, irrespective of the color difference formula used.
  • The CIEDE2000 formula demonstrated a better fit than CIELAB for evaluating gingival color difference thresholds.
  • These established thresholds serve as valuable guides for dental material quality control, clinical interpretation, and standardization in dentistry.