Fig. 2

Calibration of a clinical picture of a patient’s smile according to the 3D CT image (e.g., preoperative image). a 2D photograph; b 3D CT image. At first, the lateral intercanthus distance (white α) in the smile picture matched that (white α’) in the 3D CT image. The vertical ratio of the photograph was modified by adjusting the vertical distance (black β) from the lateral intercanthus line to the anterior tooth in the smile picture to match that (black β’) in the 3D CT image. The vertical distance of the lips during smiling, which is the shortest distance (blue line) from the lateral intercanthus line (red line) to the mouth corner in the photograph