Table 1

	Score	Group 1 (n = 74)	Group 2 (n = 76)	Group 3 (n = 72)
Coronal third	1	64^a	68^a	64^a
	2	8^a	6^a	6^a
	3	4^a	2^a	1^a
	4	0^a	0^a	0^a
Middle third	1	50^a	48^a	44^a
	2	12^a	18^a	14^a
	3	10^a	8^a	10^a
	4	2^a	2^a	4^a
Apical third	1	4^a	20^b	16^b
	2	24^a	38^b	36^b
	3	36^a	14^b	16^b
	4	10^a	4^a	4^a

Note: Different superscript letters indicate statistical significant differences (P < 0.05) among groups using the Kruskal-Wallis test and Bonferroni multiple range test for multiple group comparisons.