Chroma-dependence of CIEDE2000 acceptability thresholds for dentistry.

Area of Science:

• Dental Materials Science
• Color Science
• Visual Perception

Background:

• Accurate color matching is crucial in restorative dentistry.
• Existing color difference thresholds may not adequately represent clinical acceptability across all dental shades.
• Understanding visual perception of color differences is key for material selection and quality assessment.

Purpose of the Study:

• To determine the visual 50:50% color difference acceptability thresholds (AT) within different regions of the dental color space.
• To investigate how varying chromaticity (color intensity) affects these acceptability thresholds.
• To compare AT between dentists and laypersons.

Main Methods:

• 144 dental resin composite pairs were evaluated by 40 observers (dentists and laypersons).
• Samples were categorized into Low Chroma (LC), Medium Chroma (MC), and High Chroma (HC) sets.
• Takagi-Sugeno-Kang fuzzy approximation calculated CIEDE2000 50:50% AT; statistical significance was tested using paired t-tests and Bonferroni correction.

Main Results:

• The CIEDE2000 50:50% AT were 2.84 for LC, 2.31 for MC, and 1.80 for HC samples.
• Significant differences in AT were found between chromaticity sets and observer groups.
• Higher acceptability was observed for more achromatic (lower chroma) samples.

Conclusions:

• Dental color acceptability thresholds are significantly influenced by sample chromaticity.
• Achromatic samples (low chroma) are generally more acceptable than chromatic samples (high chroma).
• These findings provide a basis for quality control tools in dentistry, aiding clinical performance assessment and interpretation of findings.