Cone-Beam Computed Tomography Assessment of Prevalence of Procedural Errors in Maxillary Posterior Teeth

Table 3

Comparison of procedural errors between maxillary premolar and molar teeth.

Procedural errors	Total in		Total	Monte Carlo
	Premolars	Molars		value	95% confidence interval
					Lower bound	Upper bound
Apical perforation	3 (1.9%)	5 (3.1%)	8 (5.0%)	0.031	0.028	0.034
Broken instrument	3 (1.9%)	2 (1.2%)	5 (3.1%)
Missed canal	9 (5.6%)	35 (21.9%)	44 (27.5%)
Underfilled	24 (15.0%)	56 (35.0%)	80 (50.0%)
Overfilled	8 (5.0%)	12 (7.5%)	20 (12.5%)
Root fracture	3 (1.9%)	0	3 (1.9%)
	50 (31.2%)	110 (68.8%)	160 (100.0%)

Significant differences at .