Morphology of Sella Turcica and Bridging Prevalence Correlated with Sex and Craniofacial Skeletal Pattern in Eastern Asia Population: CBCT Study

Figure 4

The angular measurements of cephalometric analysis included (1) A point-nasion-B point (ANB) angle; (2) axis angle, which was the angle formed by the Frankfort horizontal plane (FH plane; Po-Or plane) to the S-Gn plane; (3) SNMP angle (the angle formed by the sella-nasion plane to the mandibular plane or menton-gonion plane); (4) PPMP angle, which was the angle formed by the palatal plane (ANS-PNS plane) to the mandibular plane (menton-gonion plane); (5) U1SN (the angle formed by the long axis of the upper central incisor to sella-nasion plane); (6) L1MP (the angle formed by the long axis of the lower central incisor to the mandibular plane or menton-Gonion plane). The linear measurements of cephalometric analysis are as follows: (1) ArGn (the distance between articulare and gnathion); (2) PogNv (the vertical distance from pogonion to a perpendicular line extended from nasion to the FH plane); (3) U1NA (the distance from the tip of the upper central incisor to nasion-A point line); (4) L1NB (the distance from the tip of lower central incisor to nasion-B point line).