Table 1 Cephalometric parameters and their descriptions
Maxillary angle SNA | Angle formed by the lines SN and NA (degrees) |
Mandibular angle SNB | Angle formed by the lines SN and NB (degrees) |
Skeletal class ANB | Angle formed by the lines AN and NB (degrees) |
Skeletal divergence SN/GoMe | Angle formed by the lines SN and GoMe (degrees) |
Maxillary bone base A/Olp | Distance from the Olp line to point A (mm) |
Mandibular bone base Pg/Olp | Distance from the Olp line to the point Pg (mm) |
Airway space AD1 | Linear distance between the posterior nasal spine and the closest point of adenoidal tissue along the line Ba-PNS (mm) |
Airway space AD2 | Linear distance between the PNS and the nearest point of adenoid tissue along the line passing through PNS and perpendicular to the line joining S and Ba (mm) |
Airway space AD-PtV | Linear distance between the closest point of adenoid tissue and a point on the pterygoid vertical 5 mm above the intersection point between PTV and Ba-PNS (mm) |
Oropharyngeal airway space OA | Linear distance of the oropharyngeal space along the palatal plane (PL; plane passing through anterior and posterior nasal spine) passing through the gonion (mm) |
Laryngopharyngeal airway space LA | Linear distance of the laryngopharyngeal space along the C4 plane (mm) |