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

Table 2

Frequency of missed canals, ledge formation, and apical perforation in different canals of endodontically treated mandibular molars.

Procedural error	Canal type	Frequency	Percentage (%)
Missed canals	Distobuccal	10	17.5
	Distolingual	23	40.4
	Mesial	2	3.5
	Mesiobuccal	14	24.6
	Mesiobuccal 1	2	3.5
	Mesiobuccal 2	4	7.0
	Mesiolingual	12	21.2
Ledge formation	Distal	2	14.3
	Mesiobuccal	6	42.9
	Mesiolingual	8	57.1
Apical perforation	Distal	14	58.3
	Mesial	4	16.7
	Mesiobuccal	8	33.3
	Mesiolingual	6	25.0