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

Table 2

Procedural errors in maxillary molar teeth.

Tooth	First molars ()				Second molars ()
Root canal	MB1	MB2	P	DB	MB1	MB2	P	DB
Apical perforation	0	0	2 (2.1%)	2 (2.1%)	0	0	0	1 (5.9%)
Strip perforations (with extrusion of material; into the furcation area)	0	0	0	0	0	0	0	0
Broken instrument within the root canal	3 (3.2%)	0	0	1 (1.1%)	0	0	0	0
Missed root canal	0	31 (32.6%)	0	0	0	0	0	4 (23.5%)
Underfilling	40 (42.1%)	4 (4.2%)	2 (2.1%)	2 (2.1%)	6 (35.3%)	0	2 (11.8%)	0
Overfilling	0	0	2 (2.1%)	6 (6.3%)	0	0	2 (11.8%)	2 (11.8%)

MB1: mesiobuccal 1; MB2: mesiobuccal 2; DB: distobuccal; P: palatal.