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. 2018 Dec 30;9(4):e1. doi: 10.5037/jomr.2018.9401

Table 7.

Classifications of mesiodens according to their positions using cone-beam computed tomography

In frontal plane N (%)
Type A Straight long axis, no inclination 78 (60)

Type B Crown in midline, root in distal 24 (18.46)

Type C Root in midline, crown in distal 28 (21.53)

In sagittal plane N (%)

Type I Fully erupted 24 (18.46)

Type II Partially erupted 5 (3.84)

Type III Impacted, in contact with the central teeth 85 (65.38)

Type IV Impacted, not in contact with the central teeth 7 (5.38)

Type V In contact with nasal cavity 8 (6.15)

Type VI In contact with nasal septum 1 (0.76)

In axial plane N (%)

Type a Labial to dental arch 7 (5.38)

Type b In line with dental arch 56 (43.07)

Type c Anterior to NPC, in contact with NPC 60 (46.15)

Type d Behind NPC, in contact with NPC 1 (0.76)

Type e Behind NPC, not in contact with NPC 6 (4.61)

N = total number of mesiodens; NPC = nasopalatine canal.