Table 3.

Relationship between treatment outcome and root canal preparation technique at different review periods.

Treatment outcome	Post 6-month (7-month) treatment outcome (%)		1-year treatment outcome (%)		4-year treatment outcome (%)		5-year treatment outcome (%)
	Rotary	Manual	Rotary	Manual	Rotary	Manual	Rotary	Manual
Favourable	46 (97.9)	36 (83.7)	46 (97.9)	37 (86.0)	45 (95.7)	40 (93.0)	46 (97.9)	40 (95.2)
Uncertain	1 (2.1)	7 (16.3)	1 (2.1)	6 (14.0)	2 (4.3)	2 (4.7)	0 (0)	0 (0)
Unfavourable	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)	1 (2.3)	1 (2.1)	2 (4.8)
Total	47 (100)	43 (100)	47 (100)	43 (100)	47 (100)	43 (100)	47 (100)	42 (100)
P value	.021*		.043*		.572		.498

One tooth in the manual group was extracted due to vertical root fracture before the final review.

^⁎Statistical significance.

N/A represents no statistics for variables with all entries in only one group.