Fig. 2
From: Prediction of orthognathic surgery plan from 3D cephalometric analysis via deep learning
Four reference planes of CMF structure and five key landmarks. a frontal view. b lateral view. Frankfurt horizontal plane (FH) was defined as the plane passing through orbitale point of two sides (OrR, OrL) and midpoint of bilateral porion points (PoR, PoL). Horizontal plane (HP) was defined as the plane parallel to FH and through nasion (N). Sagittal plane (SP) was defined as the plane normal to FH and through N point and basion (Ba). Coronal plane (CP) was defined as the plane through sella point (S) and normal to SP and FH. Five key landmarks include A point (A), midpoint of U1 incisal tip (UI), midpoint of L1 incisal tip (LI), B point (B) and pogonion point (Pog)