Cone-Beam Computed Tomography Assessment of Quality of Endodontic Treatment and Prevalence of Procedural Errors in Mandibular Molars

Table 5

Comparison of the frequency of procedural errors in the right and left mandibular first and second molars.

Procedural errors	Right first molars	Left first molars	Right second molars	Left second molars	values
Underfilling	34 (37.8%)	16 (20.0%)	34 (47.2%)	30 (34.9%)	0.005
Overfilling	15 (16.7%)	11 (13.8%)	13 (18.1%)	16 (18.6%)	0.846
Voids	10 (11.1%)	9 (11.3%)	10 (13.9%)	18 (20.9%)	0.218
Missed canals	12 (13.3%)	10 (12.5%)	22 (30.6%)	13 (15.1%)	0.010
Ledge formation	6 (6.7%)	2 (2.5%)	0	6 (7.0%)	0.085
Root fracture	0	0	2 (2.8%)	2 (2.3%)	0.219
Apical perforation	4 (4.4%)	7 (8.8%)	4 (5.6%)	9 (10.5%)	0.404
Strip perforation	2 (2.2%)	0	0	0	0.150
Broken instrument	0	4 (5.0%)	4 (5.6%)	2 (2.3%)	0.136
Canal transportation	9 (10.0%)	3 (3.8%)	7 (9.7%)	1 (1.2%)	0.037
Root resorption	3 (3.3%)	6 (7.5%)	7 (9.7%)	2 (2.3%)	0.134
Apical lesions	44 (48.9%)	34 (42.5%)	39 (54.2%)	34 (39.5%)	0.253