Cone-Beam Computed Tomography Evaluation of Mental Foramen Variations: A Preliminary Study

Table 1

The frequency (%) direction of opening, vertical, and horizontal locations of mental foramen.

Variables		Foramen in right side	Foramen in left side
The opening direction of mental foramen	Superior	27.2	30.6
	Superior-posterior	64.4	62.2
	Labial	5	2.2
	Mesial	1.7	3.3
	Posterior	1.7	1.7
Vertical location of mental foramen	Coronal to the apex	1.7	2.2
	At the apex	6.1	7.8
	Apical to the apex	24.4	31.1
	No tooth	67.8	58.9
Horizontal location of mental foramen	Anterior to PM1	0	0
	PM1	1.1	0.6
	PM1-PM2	11.1	17.2
	PM2	14.4	17.2
	PM2-M1	5.6	6.1
	M1	0	0
	No tooth	67.8	58.9