Critical appraisal. Color in dentistry: match me, match me not.

This Critical Appraisal focuses on defining color match in dentistry through determination of perceptibility and acceptability visual thresholds. Differences between in vitro and clinical conditions, monochromatic and polychromatic materials, and old and new Commission Internationale de l'Eclairage (International Commission on Illumination; CIE) formulas will be considered. Color difference thresholds can serve as a quality control tool and as guidelines for selection of dental materials and evaluation of their clinical performance.