Clinical Study of Posterior-superior Repositioning of Maxilla by Le Fort Ⅰ Osteotomy

Patients with a long face and open bite often undergo posterior-superior repositioning of the maxilla in orthognathic surgery. In this paper, we report an analysis of cases of posterior-superior repositioning of the maxilla at Matsuda Orthopedic Memorial Hospital from June 2004 to December 2018. The results were as follows : 1.There were 44 patients who had undergone orthognathic surgery for posterior-superior repositioning of the maxilla. The patients were 3 males (7%) and 41 females (93%). 2.The mean age at surgery was 27.3 at s years old (range : 16-60 years). 3.The most common clinical diagnosis was maxillary prognathism with maxillary excess (16 cases : 36.4%). 4.The most common surgical method was Le Fort I osteotomy (LF I+SSRO (23 cases : 52.3%)), followed by LF I+SSRO+Genioplasty (GEN) (11 cases : 25.0%). 5.The average time of operation for LF I+SSRO was 306.7±56.2 minutes and that for LF I+SSRO+GEN was 337.1±59.1 minutes. 6.The average amount of bleeding was 461.7± 188.0ml for LF I+SSRO and that for LF I+SSRO+GEN was 377.0±206.0ml. 7.The average distance of posterior and superior of the maxilla was 3.6±1.6mm and 4.3±2.1mm, respectively.