Aim: to evaluate the postoperative stability after maxillomandibular orthognathic surgery in different planes with regard to repositioning vector and magnitude as well as rotation of occlusal plane.

Materials and methods: 156 patients were included in this study who had undergone maxillomandibular orthognathic surgery from January 2007 to December 2010 and qualified follow-up schedule. Patients were classified according to the amount and direction of surgical repositioning of upper and lower jaws. The stability of maxilla was assessed in vertical and horizontal planes. For the vertical stability patients were subclassified into: anterior downgrafting, posterior downgrafting, anterior impaction, posterior impaction, anterior “no change” and posterior “no change”. The horizontal movements were subclassified into advancement and “no change”. Based on the combination of vertical and horizontal movements, patients were assigned with CW, CCW or linear category of repositioning. For the mandibular surgery, horizontal movements were classified into advancement, “no change” and setback; upward or downward movements or vertical “no change” of incisors, upward or downward movement or “no change” in vertical molar position. Transversal movements were classified into right or left repositioning or “no change” of lower midline, right or left repositioning or “no change” of molars.

Evaluation of data: 1. Clinical investigation of occlusion: overjet, overbite and midline concordance in CR. 2. Stability of jaws in 3D were determined by means of superimposition of preoperative, immediate postoperative and follow-up scans and comparison of skeletal landmarks at different time points.

Results and conclusions: Under processing.

Conflict of interest : None.