The morphology of permanent maxillary first molars evaluated by cone-beam computed tomography among a Yemeni population

Table 4 Distribution of root canal configurations in three-rooted MFMs according to Vertucci’s classification and other additional types

	Vertucci’s canal types							Additional canal types							New type	Total
	I	II	III	IV	V	VI	VII	2-1-2-1^†	1-2-3-2^‡	1-2-3-2-1^‡	1-3-1-2^‡	3-2-1^‡	1-2-1-2-1^¥	1-2-3^¥	2-1-2-1-2*	Total
MBR
n	66	93	86	42	21	25	8	16	1	1	1	1	8	1	2	372
%	17.7	25	23.1	11.3	5.6	6.7	2.2	4.3	0.3	0.3	0.3	0.3	2.2	0.3	0.5	100
DBR
n	357	2	11	0	1	0	1	0	0	0	0	0	0	0	0	372
%	96	0.5	3	0	0.3	0	0.3	0	0	0	0	0	0	0	0	100
PR
n	370	0	0	0	1	0	0	0	0	0	0	0	1	0	0	372
%	99.5	0	0	0	0.3	0	0	0	0	0	0	0	0.3	0	0	100

ISSN: 1472-6831