Fig. 6From: Assessing the effect of multibracket appliance treatment on tooth color by using electronic measurementa, b Box plots showing the distribution of ΔE for the 2D-system (a; left) and the 3D-system (b; right) on tooth level. Orange circle: mean; bold line: median; box: interquartile range (between 25 and 75%); whiskers: range between 12.5 and 87.5%; grey dots figure the 120 observations; red line: clinically important difference at 3.7 units or 2.7 unitsBack to article page