A modification of the pterygoid plate separation in low-level maxillary osteotomies.

The technical details of a modified procedure for separation of the pterygoid plates in low-level maxillary osteotomies is described. The cut is made through the tuberosity and ends at the posterior aspect of the hard palate, medial and anterior to the pterygomaxillary fissure. This technique provides several advantages over the more classically described posterior vertical cut through the pterygomaxillary suture. The major advantages are that it is anatomically less hazardous and allows greater mobility of the segments. It also permits a larger vascular pedicle to be maintained.