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Table 1 Short description of various parameters used in the study

From: Cephalometric study to test the reliability of anteroposterior skeletal discrepancy indicators using the twin block appliance

Parameter Short description
ANB The angle formed by the intersection of the point A to N (nasion) line and the point B to N (nasion) line (Figure 1)
β angle A perpendicular is dropped from point A to a line drawn from C (center of condyle) to point B. β angle is the angle between this perpendicular and the A-B line (Figure 2)
YEN angle Angle between the S (sella) to M (center of the premaxilla) line and the M to D (center of the symphysis) line (Figure 3)
W angle A perpendicular is dropped from M to the S-D line. W angle is measured between this perpendicular and the M-D line (Figure 4)
APDI (NPg-FH plane) ± ( NPg-AB) ± (FH-palatal plane) (Figure 5)
Wits appraisal Distance between the projection of point A and point B on the occlusal plane (Figure 6)
App-Bpp Distance between the projection of point A and point B on the palatal plane (Figure 6)