Table 1.
Parameters analyzed in the study
| Parameter | Details |
|---|---|
| Number of IF | Seen at the level of palate (e.g., 1, 2, 3, 4) (axial section) |
| Shape of IF | Classified as round, oval, heart (axial section) |
| Mesio-distal diameter of IF | The inner diameter measured at the level of the hard palate inferiorly (axial section) |
| Antero-posterior diameter | Assessed in sagittal section |
| Number of opening of Stenson’s foramen | Single or multiple. Seen at the level of nasal fossa (axial section) |
| Shape of the NPC | Classified as funnel (increased anteroposterior dimension from nasal fossa to hard palate), hourglass (narrowest anteroposterior dimension at mid level compared to dimension at nasal fossa and hard palate level), cylindrical (parallel labial and palatal walls) and spindle (widest anteroposterior dimension at midlevel compared to dimension at nasal fossa and hard palate level) (sagittal section) |
| Curvature of NPC | Classified as vertical, vertical curved, slanted curved and slanted (sagittal section) |
| Angle of NPC | Angle between floor of nasal fossa and long axis of canal (sagittal section) |
| Length of canal | Measured between floor of the nasal fossa and level of hard palate along the long axis of the canal (sagittal section) |
| Mesiodistal dimension of NPC at nasal fossa level | Inner diameter measured at the level of nasal fossa (sagittal/coronal section) |
| Mesiodistal dimeter of NPC at mid level | Inner diameter measured at the level of midpoint between the nasal fossa and the hard palate (sagittal/coronal section) |
| Mesiodistal dimeter of NPC at hard palate level | Inner diameter measured at the level of hard palate (sagittal/coronal section) |
| Additional foramen | Assessed in axial section |
NPC=Nasopalatine canal; IF=Incisive foramen