Morphological characteristics influencing the orthodontic extraction strategies for Angle's class II division 1 malocclusions

Progress in Orthodontics

Table 3 Lateral radiograph measurements

Number	Measurement	Definition
1	SNA°	Angle formed by the intersection of NS and NA lines
2	SNB°	Angle formed by the intersection of NS and NB lines
3	ANB°	Angle formed by the intersection of NA and NB lines
4	NBa-PtGn°	Posteroinferior angle formed by the intersection of NBa and PtGn lines
5	ANS-Xi-Pm°	Angle formed by the intersection of Xi-ANS and Xi-Pm lines
6	MP-SN°	Anteroinferior angle formed by the intersection of MP and SN planes
7	DC-Xi-Pm°	Anterosuperior angle formed by the intersection of Xi-DC and Xi-Pm lines
8	L1-APog	Distance from point L1 to line APog
9	A-NPog	Distance from point A to line NPog
10	P6U-PTV	Perpendicular distance between point P6U and line perpendicular to Frankfurt plane (Po-Or plane), tangent to Pt
11	U1-NPog	Distance from point U1 to line NPog
12	L1-NPog	Distance from point L1 to line NPog
13	Ls-Ns Pog'	Distance from point Ls to line NsPog'
14	Li-Ns Pog'	Distance from point Li to line NsPog'