Stability Following Combined Maxillary and Mandibular Osteotomies Treated with Rigid Internal Fixation

摘要

Skeletal stability was examined in sixteen patients following combined maxillary and mandibular osteotomies using rigid internal fixation. The postoperative changes of all measured anatomic landmarks were generally less than 1.0mm for linear measurements, and less than 2.0 degrees for angular measurements. The removal of intermaxillary fixation (IMF) splints accounted for 85% to 95% of the counterclockwise rotation in the proximal and distal segments. Maxillary inferior repositioning and large mandibular advancements exhibited the greatest tendency for relapse; however, the changes were less than comparable procedures using non-rigid methods for stabilization. For a given category of surgical procedures, relapse was essentially unrelated to the magnitude of the surgical repositioning. Although the use of suspension wires, IMF, and transosseous wire fixation have traditionally provided satisfactory clinical results, the use of rigid internal fixation in combined double jaw procedures provides better stabilization of dentosseous segments when compared to non rigid fixation, and is particularly indicated in complex surgical procedures.