Dental ceramics: a CIEDE2000 acceptability thresholds for lightness, chroma and hue differences

Area of Science:

• Dental Materials Science
• Color Science
• Visual Perception

Background:

• Accurate color matching is crucial in restorative dentistry.
• Existing color difference formulas require validation for dental ceramics.
• Visual perception of color differences influences patient satisfaction and clinical outcomes.

Purpose of the Study:

• To establish visual 50:50% acceptability thresholds for lightness, chroma, and hue differences in dental ceramics using the CIEDE2000 formula.
• To assess the performance of the CIEDE2000 formula with varying parametric factors (K(L):K(C):K(H)).

Main Methods:

• A 30-observer panel evaluated ceramic sample subsets based on lightness, chroma, and hue differences.
• Takagi-Sugeno-Kang Fuzzy Approximation was employed to calculate 50:50% acceptability thresholds.
• The performance of CIEDE2000(1:1:1) and CIEDE2000(2:1:1) was evaluated against visual results using the PF/3 metric.

Main Results:

• The 50:50% CIEDE2000 acceptability thresholds were ΔL'=2.92, ΔC'=2.52, and ΔH'=1.90.
• The overall color difference (ΔE') thresholds were 1.87 for CIEDE2000(1:1:1) and 1.78 for CIEDE2000(2:1:1).
• The CIEDE2000(2:1:1) formula yielded a better performance factor (PF/3 = 132.31) compared to CIEDE2000(1:1:1) (PF/3 = 139.86).

Conclusions:

• Statistically significant differences exist in CIEDE2000 acceptability thresholds for lightness, chroma, and hue in dental ceramics.
• The CIEDE2000(2:1:1) formula demonstrates improved accuracy in predicting visual acceptability of color differences for dental ceramics.
• These findings aid in refining color matching protocols and improving the aesthetic outcomes of dental restorations.