106 patients underwent orthognathic surgery in our department during the past 13 years, and every year showed a tendency to increase. The ratio between males and females was 1: 3. The age of male patients ranged from 16 years and 10 months to 35 years with a mean of 22 years, and from 11 years and four months to 38 years and 10 months with a mean of 20 years and six months for females.
55 patients (51.9%) were referred from the orthodontic department of our hospital, 27 (25.5%) from orthodontic practitioners, 12 (11.3%) from general dental practitioners, and 12 (11.3%) directly visited our clinic. 71 patients (67.0%) had presurgical orthodontic treatment.
51 patients (48.1%) were diagnosed as having mandibular prognathism, 34 (32.1%) mandibular prognathism with open bite, nine (8.5%) asymmetrical mandibular prognathism, four (3.8%) mandibular prognathism with both open bite and asymmetry, three (2.8%) maxillary micrognathia, two (1.9%) congenital mandibular micrognathia, one (0.9%) skeletal open bite.
As concerns surgical methods, during the first five years only mandibular body ostectomy had been performed, since 1982 sagittal splitting of the rami has carried out, since 1987 Le Fort I osteotomy and simultaneous bimaxillary surgery has been performed.
The average time of the operation was as follows: 3°23' for body ostectomy, 3°29' for sagittal splitting osteotomy, 4°10' for Le Fort I osteotomy, 6°36' for simultaneous bimaxillary osteotomy, 3°49' for alveolar segmental osteotomy.
The average bleeding amounts during operations were as follows: 195.8 ml in body ostectomy, 304.1 ml in sagittal splitting osteotomy, 272.0 ml in Le Fort I osteotomy, 705.6 ml in simultaneous bimaxillary osteotomy, 331.0 ml in alveolar segmental osteotomy. Out of 106 patients, 24 (22.6%) had blood transfusion, 18 had autotransfusion.
The average period of intermaxillary fixation was as follows: 52.4 days for body ostectomy, 48.1 days for sagittal splitting osteotomy with wire osteosynthesis, 19.1 days for sagittal splitting osteotomy with rag screw osteosynthesis, 20.7 days for Le Fort I osteotomy, 28 days for simultaneous bimaxillary osteotomy.
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