Table 1.

Definition of Skeletal Measurements

Vertical Facial Proportions

AFH: Anterior Facial Height, measured from Nasion-Menton, denotes length of anterior face

PFH: Posterior Facial Height, measured from Sella-Gonion, denotes length of posterior face

PFH/AFH: ratio of Posterior Facial Height to Anterior Facial Height; denotes differential length of anterior and posterior face

UAFH: Upper Anterior Facial Height, measured from Nasion-ANS

LAFH: Lower Anterior Facial Height, measured from ANS-Menton

LAFH/TAFH: ratio of Lower Anterior Facial Height to Total Facial Height; denotes proportion of lower anterior face.

Maxilla

PNS-ANS: maxillary length, distance measured from the anterior nasal spine to posterior nasal spine.

SNA: angle measured between Sella-Nasion and A point, denotes sagittal relationship of the maxilla to cranial base

ANB: angle measured between maxilla and mandible with respect to N, denotes the sagittal relationship between maxilla and the mandible

Mandible

Co-Gn: measured from condylion to gnathion in mm, denotes total mandibular length

Co-Go: condylion to gonial angle measured in mm, denotes the height of ramus of mandible

Sn-GoGn: measured as angle formed by S-N and lower border of the mandible(GoGn), denotes vertical relationship of the mandible to the cranial base.

SNB: angle measured between S-N and B point, denotes sagittal relationship of the mandible to cranial base

Cranial Base

S-N: measured from Nasion to Sella in mm, denotes length of anterior cranial base

S-Ba: measured from Sella-to Basion in mm, denotes length of posterior cranial base

Ba-S-N: cranial base angle formed by Nasion-Sella-Basion, denotes cranial base flexure