Figure 1.

Pre- (a) and post- (b) maxillomandibular advancement (MMA) lateral cephalometric radiographs demonstrating analyzed parameters. Pre- and post-MMA cephalometric images were digitally overlaid to determine the change in position of the following parameters: anatomic B-point (most posterior midline point in the anterior concavity of the mandible); posterior nasal spine (PNS) along the sella-nasion line; and sella-nasion-point B (SNB) angle. Enlargement of the posterior airway space was also determined on all cephalometric radiographs by measuring the narrowest point in the airway pre- and post-MMA, then subtracting the larger (post-MMA) value from the smaller (pre-MMA) value to obtain the difference.