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Table 1 CIE color system

From: Impact of nanohydroxyapatite on enamel surface roughness and color change after orthodontic debonding

Color parameter Definition Color range
L* Measure of lightness (value) Ranging from black (0) to white (100)
a* The position on red-green axis Ranging from red (+) to green (−)
b* The position on yellow-blue axis Ranging from yellow (+) to blue (−)