Table 5. Prognosis of cracked teeth according to the probing depth at 3 and 6 mo after treatment.

		3 mo					6 mo
Year	PPD	Total N	Free	Persisted	Ext	p -Value	Total N	Free	Persisted	Ext	p -Value
Abbreviation: PPD, periodontal probing depth. Note: p -Values were computed to compare sample ratio difference between free and persisted according to PPD using the binomial test. A p -value <0.05 was considered to indicate statistical significance.
2009	<3	26	22 (84.6)	4 (15.4)	0 (0)	<0.001	16	14 (87.5)	2 (12.5)	0 (0)	0.004
	4–6	16	15 (93.8)	1 (6.2)	0 (0)	<0.001	11	11 (100)	0 (0)	0 (0)	<0.001
	>6	3	0 (0)	3 (100)	0 (0)	0.250	2	0 (0)	2 (100)	0 (0)	0.500
	Total	45	37 (82.2)	8 (17.8)	0 (0)	<0.001	29	25 (86.2)	4 (13.8)	0 (0)	<0.001
2019	<3	113	110 (97.3)	3 (2.7)	0 (0)	<0.001	28	25 (89.3)	3 (10.7)	0 (0)	<0.001
	4–6	53	41 (77.4)	12 (22.6)	0 (0)	<0.001	15	12 (80)	3 (20)	0 (0)	0.035
	>6	14	10 (71.4)	4 (28.6)	0 (0)	0.180	7	6 (85.7)	1 (14.3)	0 (0)	0.125
	Total	180	161 (89.4)	19 (10.6)	0 (0)	<0.001	50	43 (86)	7 (14)	0 (0)	<0.001
2009+2019	<3	139	132 (95)	7 (5)	0 (0)	<0.001	44	39 (88.6)	5 (11.4)	0 (0)	<0.001
	4–6	69	56 (81.2)	13 (18.8)	0 (0)	<0.001	26	23 (88.5)	3 (11.5)	0 (0)	<0.001
	>6	17	10 (58.8)	7 (41.2)	0 (0)	0.629	9	6 (66.7)	3 (33.3)	0 (0)	0.508
	Total	225	198 (88)	27 (12)	0 (0)	<0.001	79	68 (86.1)	11 (13.9)	0 (0)	<0.001