Norms and Standard Deviation Values for Subject Selection

Angle

Definition

Normal

SD

Sn-GoGn

Angle between the SN plane and the mandibular plane defined as Go-Gn

29.8˚

±5.5

SN-PP

Angle between the SN plane and palatal plane defined as ANS-PNS

8.2˚

±3.3

Y-axis

Angle between SN plane and line connecting Sella and Gnathion

66.5˚

±3.7

PP-GoGn

Angle between the palatal plane defined as ANS-PNS and mandibular plane defined as Go-Gn

21.9˚

±5.6

UFH/LFH

Ratio between upper facial height and lower facial height

0.812

±0.082

Ar-Go-Me

Gonial angle

123.9˚

±5.4