Color difference thresholds in dental ceramics

  • Ghinea R
  • Pérez M
  • Herrera L
 et al. 
  • 52

    Readers

    Mendeley users who have this article in their library.
  • 100

    Citations

    Citations of this article.

Abstract

Objectives: The objective of the study was to determine the perceptibility and acceptability thresholds for dental ceramics using CIEDE2000 (ΔE00) and CIELAB (ΔEab) color difference formulas and a novel TSK Fuzzy Approximation. Methods: A 13-observer panel performed independent observations of perceptibility and acceptability judgments on 105 pairs of ceramic discs (14 mm in diameter and 3 mm thick). Color differences of the disc pairs were calculated using both color difference formulas (ΔE00ranged from 0.10 to 9.91). Two fitting procedures were used: S-shaped curve and TSK Fuzzy Approximation. For both procedures, from the resultant fitting curves, the 95% confidence intervals were estimated and the 50:50% thresholds were calculated (50% positive and 50% negative answers). Results: With the S-shaped fitting procedure, a 50:50% acceptability threshold was found to be ΔE00= 2.25 (r2= 0.88) and ΔEab=3.46 (r2= 0.85). Corresponding values with a TSK Fuzzy Approximation were ΔE00= 2.23 (r2= 0.89) and ΔEab=3.48 (r2= 0.86). The perceptibility thresholds for fitted S-shape curves were ΔE00= 1.30 (r2= 0.74) and ΔEab=1.80 (r2= 0.70) and ΔE00= 1.25 (r2= 0.75), and ΔEab=1.74 (r2= 0.71) for the TSK Fuzzy Approximation. The ΔL′, ΔC′, ΔH′ values corresponding to a 50% acceptability threshold were ΔL′ = 2.44, ΔC′ = 3.15 and ΔH′ = 3.24 respectively. Conclusions: The CIEDE2000 color difference formula provided a better fit than CIELAB formula in the evaluation of color difference thresholds of dental ceramics. There was a statistically significant difference between perceptibility and acceptability thresholds for dental ceramics. The TSK Fuzzy Approximation has been proved to be a reliable alternative approach for the color threshold calculation procedure. © 2010 Elsevier Ltd.

Author-supplied keywords

  • Acceptability thresholds
  • CIEDE2000
  • CIELAB
  • Dental ceramics
  • Fuzzy Approximation
  • Perceptibility thresholds

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text

Authors

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free