Posterior Maxillary Segment Osteotomy—PMSO—Step-by-Step Procedure

Posterior maxillary segment osteotomies distal to the canine offer the possibility of closing the open bite by impaction of the posterior lateral maxillary segment in cases of vertical growth excess and presence of an open bite with sagittally correct conditions. Mild transverse crossbite corrections are possible. The one-stage procedure with ostectomy on the buccal and palatal side is preferred today. A usually bilateral posterior segment osteotomy technique can also be used in conjunction with a Le Fort I osteotomy for vertical corrections.