[Changes in airway space following mandibular setback using sagittal split ramus osteotomy with rigid internal fixation].
The changes in airway space following mandibular setback using sagittal split ramus osteotomy and rigid internal fixation were studied in 28 Japanese patients with mandibular prognathism. Lateral cephalometric radiographs were taken immediately before and shortly after surgery as well as 5 to 12 months postoperation. The mean setback of mandible was 8.3 mm in the right side, and 8.2 mm in the left side. The mean amount of relapse of pogonion point during the following-up period was 0.52 mm horizontally, and 0.92 mm vertically. A significant decrease in airway space width and area, espacially in the lower part of airway space was found following mandibular setback shortly after surgery. Although there was some increase both in airway space width and area during the following-up period, they did not increase to their original values. This suggests that the narrowing of airway space following mandibular setback using sagittal split osteotomy can be permanent. No significant correlation was found between the amount of mandibular setback and airway space changes, and no significant correlation was found between the amount of airway space changes and relapse of pogonion point during the following-up period.
Mao
C
C
PUMC Hospital, Beijing.
Aruga
S
S
Matsuura
M
M
Seto
K
K
D000293:Adolescent; D000328:Adult; D002508:Cephalometry / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging; D010027:Osteotomy / Q000379:methods; D010614:Pharynx / Q000473:pathology; D011184:Postoperative Period; D011378:Prognathism / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D011859:Radiography