Table 1. Values (distances and angles) relative to the greater palatine canal.

Landmarks	Mean distance ± SD (mm)	95% CI range (mm)
Anterior inferior NLD to anterior GP canal	31.52 ± 2.86	30.96–32.08
Anterior GP canal to posterior hard palate	7.71 ± 1.76	7.36–8.05
Anterior GP canal to posterior wall of maxillary sinus	7.07 ± 1.79	6.71–7.42
Landmarks	Mean angle ± SD (deg)	95% CI range (deg)
Angle GP canal to vertical (degrees)	23.01 ± 6.20	21.79–24.23

Abbreviations: CI, confidence interval; GP, greater palatine; NLD, nasolacrimal duct; SD, standard deviation.