Landmarks
Glabella
The most prominent point of the anterior bony contour of the frontal bone, in the mid-sagittal plane
SN
A line through Sella to Nasion, represents the AP extent of the anterior cranial base
SNA
Skeletal anterio-posterior position of the maxilla in relation to the anterior cranial base
Sella
The geometric center of the pituitary fossa (sella turcica)
FH
A line through Porion to Orbitale
ANB
Skeletal anterio-posterior relationship between maxilla and mandible
Nasion
The most anterior point of the fronto-nasal suture in the midsagittal plane
Occlusal Plane
Constructed using a line connecting the tip of the lower incisor edge to the midpoint between the upper and lower 1st permanent molar cusps
SN-MP
Skeletal vertical relationship of the mandible to the anterior cranial base
Orbitale
The lowest point on the inferior orbital margin
MP
Constructed as a line from gonion to menton
L1/MP