Figure 4. Dental cephalometric analysis, based on the angular and linear measurements. 1, The SN to the maxillary canine angle (SN-C); 2, the SN to the maxillary incisor angle (SN-U1); 3, the SN to the maxillary first molar angle (SN-U6); 4, the mandibular plane to mandibular incisor angle (MP-L1); 5, the mandibular plane to mandibular first molar angle (MP-L6); 6, the distance between the pterygoid vertical plane and the maxillary incisor tip (PTV-U1); 7, the distance between the pterygoid vertical plane and the maxillary canine tip (PTV-C); 8, the distance between the pterygoid vertical plane and the maxillary first molar centroid (PTV-U6); 9, the distance between the palatal plane and the maxillary incisor tip (PP-U1); 10, the distance between the palatal plane and the maxillary canine tip (PP-C); 11, the distance between the palatal plane and the maxillary first molar centroid (PP-U6); 12, the distance between the mandibular lingual cortex and the mandibular first molar centroid (LC-L6); 13, the distance between the mandibular plane and the mandibular incisor tip (MP-L1v); and 14, the distance between the mandibular plane and the mandibular first molar centroid (MP-L6v). Refer Table 2 for definitions of the landmarks.