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.
