Table 1.

Success, Uncertain and failure rate relative to some procedural errors

	S	U	F	Sig.
Overfilled	2	6	0	-
Underfilled	61	30	17
Proper length	11	14	5
Separated instrument	4	3	0	-
Without separated instrument	70	47	22
Poor cleaning & shaping	64	46	15	a
Adequate cleaning & shaping	10	4	7
Missed canal	6	4	4	-
Without missing	68	46	18
Perforation	0	4	4	a
Without perforation	74	46	18
Ledges	10	12	12	a
Without ledges	64	38	10
Non Gutta-percha filling	10	10	0	a
Only Gutta-percha filling	64	40	22

S: Success, U: Uncertain, F: Failure, a: Significance (P<0.05)