Dentofacial deformity cases who had undergone orthognathic operation in our department were clinico-statistically observed during the past five years(from 1988 to through 1992).
Among the total 1460 cases of inpatients operated in our department duringthe above period, the ratio of dentofacial deformity patients was 16.6%(242 cases) of them.
The kind of main causative deformities and the number of cases with each deformity are as follows : macrognathia : 233cases, micrognathia : 3cases, maxillary deficiency : 32 cases, severe skeletal open bite : 2 cases.
The classification of operations and number of cases with each operation are as follows : 188 cases of sagittal split ramus osteotomy(SSRO) alone, 29cases of bimaxillary surgery with Le Fort I osteotomy and SSRO, 16cases of intraoral vertical
ramus
osteotomy(IVRO) combinded with SSRO, 9cases of the others.
The number of cases fixed by screw or plate in SSRO cases were 117(62.2%).
Reoperations associated with previous orthognathic surgery were performed in 9 cases.
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