Figure 10

Changes from one to 5 years after two-jaw surgery for Class II problems: a, the percentage of patients with changes in the horizontal position of landmarks; b, the percentage of patients with changes in linear dimensions and the mandibular plane angle (TFH = total face height). Note that one-third of the patients experienced >2 mm backward movement of points B and Pg, and half of these had >4 mm decrease, and one-third had >2 mm downward movement of the maxilla, but overjet increased >2 mm in only 8% and >4 mm in none. This reflects a forward movement of the teeth relative to the mandible in compensation for the skeletal change. The Co-Pg distance decreased >2 mm in 12%, with no decrease >4 mm.