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Table 1 Definitions of variables in the classification of individuals regarding skeletal patterns (skeletal malocclusions and facial types)

From: Do the dimensions of the hard palate have a relationship with the volumes of the upper airways and maxillary sinuses? A CBCT study

Skeletal pattern Variables Definition
Skeletal malocclusion SNA Angle formed from the points Sella (S), Nasion (N) and A
SNB Angle formed from the points Sella (S), Nasion (N) and B
ANB Angle formed from the points A, Nasion (N) and B
Facial type Facial depth Angle formed by intersecting the lines Po (Porion)—Or (Orbitale) and N (Nasion)—Pog (Pogonion)
Facial axis angle Angle formed by intersecting the lines N (Nasion)—Ba (Basion) and Pt (Pterygoid Point)—Gn (Gnathion)
Lower facial height Angle formed by intersecting the lines Xi (Geometric center of the ramus)—ANS (Anterior nasal spine) and Xi (Geometric center of the ramus)—Pm (Suprapogonion)
Mandibular plane angle Angle formed by intersecting the lines Go (Gonion)—Me (Menton) and Po (Porion)—Or (Orbitale)
Mandibular arch Angle formed by intersecting the lines Dc (Point in the center of the mandibular condyle)—Xi (Geometric center of the ramus) and Xi (Geometric center of the ramus)—Pm (Suprapogonion)