A Study On The Postoperative Stability Of Lefort I Osteotomy In The Two-Jaw Surgery Of The Skeletal Class Iii Malocclusion Patients

ABSTRACT

PURPOSE: The purpose of this study was to evaluate the postoperative stability of LeFort I osteotomy in two-jaw surgery of class III malocclusion and to help the establishment of treatment planning in patients with a skeletal class III malocclusion future. MATERIALS AND METHODS: The lateral cephalograms of 14 patients who had been underwent two-jaw surgery via one-piece osteotomy were traced and the landmarks were identified. Repeated tracings and construction of reference planes were Comparisons were made from the immediate postoperative to late postoperative results of each landmarks on the horizontal and vertical directions. CONCLUSIONS: 1. The horizontal changes of landmark ANS, point A, PNS and Mx6Rt between immediate postoperative to late postoperative were statistically insignificant(p>0.05). 2. The vertical changes of landmark ANS, point A, PNS, Mx6Cr and Mx6Rt between immediate postoperative to late postoperative data were statistically insignificant(p>0.05). 3. The horizontal change of landmark Mx6Cr between immediate postoperative to late postoperative data was statistically significant(p<0.05). 4. Results showed that it was stable that one-piece LeFort I osteotomy in two-jaw surgery of skeletal class III malocclusion.