Table 6. Prognosis of cracked teeth according to the presence of an apical lesion at 3 and 6 mo after treatment.

3 mo							6 mo
Year	Apical lesion	Total N	Free	Persisted	Ext	p -Value	Total N	Free	Persisted	Ext	p -Value
Note: p -Values were computed to compare sample ratio difference between free and persisted according to apical lesion using the binomial test. A p -value <0.05 was considered to indicate statistical significance.
2009	O	6	5 (83.3)	1 (16.7)	0 (0)	0.219	4	4 (100)	0 (0)	0 (0)	0.125
	X	39	32 (82.1)	7 (17.9)	0 (0)	<0.001	25	21 (84)	4 (16)	0 (0)	<0.001
	Total	45	37 (82.2)	8 (17.8)	0 (0)	<0.001	29	25 (86.2)	4 (13.8)	0 (0)	<0.001
2019	O	25	19 (76)	6 (24)	0 (0)	0.015	11	9 (81.8)	2 (18.2)	0 (0)	0.065
	X	155	142 (91.6)	13 (8.4)	0 (0)	<0.001	39	34 (87.2)	5 (12.8)	0 (0)	<0.001
	Total	180	161 (89.4)	19 (10.6)	0 (0)	<0.001	50	43 (86)	7 (14)	0 (0)	<0.001
2009+2019	O	31	24 (77.4)	7 (22.6)	0 (0)	0.003	15	13 (86.7)	2 (13.3)	0 (0)	0.007
	X	194	174 (89.7)	20 (10.3)	0 (0)	<0.001	64	55 (85.9)	9 (14.1)	0 (0)	<0.001
	Total	225	198 (88)	27 (12)	0 (0)	<0.001	79	68 (86.1)	11 (13.9)	0 (0)	<0.001