Evaluation of Root Canal Configuration of Mandibular First Molars in a Palestinian Population by Using Cone-Beam Computed Tomography: An Ex Vivo Study

Table 3

Types of canal configuration per root.

Number of canals	Canal configuration
	type I	II	III	IV	V	additional type
Root
Mesial	4	124	6	172	4	10*
Total = 320	1.15%	38.8%	1.9%	53.8%	1.15%	3.2%
Distal	184	72	34	26	4	0
Total = 320	57.5%	22.5%	10.6%	8.1%	1.3%

8 roots has type (3-2) configuration (type 12 according to Gulabivala et al. [27] classification) and 2 roots has type (3-2-1) configuration (type 22 according to Al-Qudah and Awawdeh [12] classification).