Table 1 Definitions of abbreviations of the less usual cephalometric variables used

1.PP (°)

Angle formed by the maxillary incisor long axis and the palatal plane (PP)

1-PP (mm)

Linear distance from the maxillary central incisor edge projected perpendicularly to the PP

6-PP (mm)

Linear distance from mesiovestibular cusp of the maxillary first molar projected perpendicularly to the PP

6-ANSperp (mm)

Linear distance from the maxillary first molar mesial point to the ANSperp line (line perpendicular to palatal plane passing through anterior nasal spine)

1.NA (°)

Angle formed by the maxillary incisor long axis and the NA line

1-NA (mm)

Linear distance between the most anterior point of the maxillary central incisor and the NA line

IMPA (°)

Angle formed by the mandibular incisor long axis and the mandibular plane (GoMe)

1-GoMe (mm)

Linear distance between the mandibular incisor edge perpendicular to GoMe

A-Nperp (mm)

Linear distance from Point A to the Nperp line (line perpendicular to the Frankfort plane passing through point N)

Pog-Nperp (mm)

Linear distance from Pog to the Nperp line

1.NB (°)

Angle formed by the mandibular incisor long axis and the NB line

1-NB (mm)

Linear distance between the most anterior point of the mandibular central incisor and the NB line

6-Pogperp (mm)

Linear distance between the mandibular first molar mesial point to the Pog-perp line (line perpendicular to the mandibular plane Go-Me passing through Pog)

6-GoMe (mm)

Linear distance between the mesiovestibular cusp of the mandibular first molar perpendicular to GoMe