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Color differences and coverage error computation
This protocol is extracted from research article:
Color compatibility between dental structures and three different types of ceramic systems
BMC Oral Health, Feb 17, 2021;

Procedure

The color differences between shade samples of each ceramic systems and each dentine or enamel sample (n = 16) were calculated using both the CIELAB ($ΔEab∗$) and CIEDE2000 ($ΔE00$) color difference formulas [18, 19]:

where ΔL*, Δa* and Δb* are the differences in the respective coordinates for a pair of samples.

where ΔL′, ΔC′ and ΔH′ are the differences in lightness, chroma and hue for a pair of samples in CIEDE2000.

Coverage error (CE) was calculated as the mean value of the minimal color differences ($ΔEmin$) among the color of dentine or enamel samples and the color representatives (shades) of each ceramic system, as follows [27]:

where $ΔEmin$ was expressed as $ΔEab∗$ or $ΔE00$, depending on the color difference formula used, and $n$ represents the number of dentine or enamel samples.

CE values were compared with clinically relevant 50:50% Perceptibility Thresholds—PT—(ΔE00 = 0.8; ΔE*ab = 1.2) and 50:50% Acceptability Thresholds—AT—(ΔE00 = 1.8; ΔE*ab = 2.7), as reported in a multi-center study [25].

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