Fig. 1
From: Horizontal change of philtrum after orthognathic surgery in patients with facial asymmetry
Evaluation with P-A cephalograms for maxillary, mandibular midline deviation, and maxillary canting. Line A: horizontal reference line between the right and left lateral orbitale. Line B: facial midline perpendicular to line A and through the midpoint of line A. MxMD: the amount of maxillary midline deviation between line A and the maxillary dental midline. MnMD: the amount of mandibular midline deviation between line A and the mandibular dental midline. M1ver: the vertical height of the maxillary right first molar using the most latero-inferior point of the orthodontic tube. M1ver`: the vertical height of the maxillary left first molar using the most latero-inferior point of the orthodontic tube and the amount of maxillary canting, that is, the difference between M1ver and M1ver′