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.