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

Table 4

Summary of some previous studies of the canal number and canal configuration.

Author (population)	No. of teeth	No. of canals (%)		Mesial root canal configuration %		Distal root canal configuration %
		3	4	type II	type IV	type I	type II	type III
Al-Qudah and Awawdeh [12] (Jordan)	330	48	46	36	53	54	17	9.4
Al-Nazhan [14] (Saudi)	251	42	58	52.6	47.4	42.2	35	22.7
Chen et al. [17] (Taiwanese)	183	51	46	29.5	55.2	54	12.6	25
Gulabivala et al. [27] (Thai)	118	61	30.5	21	51	61	4.2	15.3
Zhang et al. [31] (Chinese)	232	56	43	—	81	84	—	—
Kim et al. [34] (Korean)	976	48	49	19	77	66	19	12