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.