. 2021;16(1):26–32. doi: 10.22037/iej.v16i1.26741

Table 1.

Mode scores attributed to the images of the specimens according to study group and apical level examined

Group	Pre-established root levels in relation to the apex
Group	2 mm	3 mm	4 mm	5 mm	6 mm
NC	Score 1 (100%)^a	Score 1 (100%)^a	Score 1 (100%)^a	Score 1(100%)^a	Score 1 (100%)^a
PC	Score 4 (100%)^b	Score 4 (100%)^b	Score 4(100%)^b	Score 4 (100%)^b	Score 4 (100%)^b
PUI	Score 1 (70%) ^a Score 2 (30%)	Score 1 (90%) ^a Score 2 (10%)	Score 1 (90%) ^a Score 2 (10%)	Score 1 (100%)^a	Score 1 (90%) ^a Score 2 (10%)
EC	Score 1 (80%) ^a Score 2 (20%)	Score 1 (80%) ^a Score 2 (20%)	Score 1 (90%) ^a Score 2 (10%)	Score 1 (100%)^a	Score 1 (90%) ^a Score 2 (10%)
XP-F	Score 1 (70%) ^a Score 2 (30%)	Score 1 (90%) ^a Score 2 (10%)	Score 1 (80%) ^a Score 2 (20%)	Score 1 (100%)^a	Score 1 (80%) ^a Score 2 (20%)
P -value	<0.001	<0.001	<0.001	<0.001	<0.001

NC, negative control; PC, positive control; PUI, passive ultrasonic irrigation; EC, EasyClean system; and XP-F, XP-Endo Finisher system. Different letters within the column indicate statistically significant differences (Kruskal-Wallis test complemented by the Dunn test, P<0.05)