Posterior Maxillary Segment Osteotomy—PMSO—Indications

Posterior maxillary segment osteotomies distal to the canine/first premolar offer the possibility of closing the open bite by impaction of the posterior lateral maxillary segments in cases of vertical growth excess and presence of an open bite with sagittally correct conditions. Transverse crossbite situations can also be closed with the aid of posterior maxillary segment osteotomy. There are one-stage and two-stage procedures, although only one-stage procedures are used today. The posterior segment osteotomy technique can also be used in conjunction with a Le Fort I osteotomy.