Correlation Analysis between Three-Dimensional Changes in Pharyngeal Airway Space and Skeletal Changes in Patients with Skeletal Class II Malocclusion following Orthognathic Surgery

Figure 2

Reference planes. FH plane: the plane constructed by the right and left Porion and right Orbitale; N perpendicular plane: the vertical plane perpendicular to the FH plane and midsagittal plane passing through Nasion; PNS-Sella plane: the plane perpendicular to the midsagittal plane, passing through PNS and Sella; PNS plane: the plane parallel to the FH plane and perpendicular to the midsagittal plane passing through PNS; CV1, 2, 3 plane: the plane parallel to the FH plane and perpendicular to the midsagittal plane passing through each CV1, 2, 3 in each.