Position of mandibular canal and ramus morphology before and after sagittal split ramus osteotomy.
OBJECTIVE
The purpose of this study was to evaluate changes in the mandibular canal and ramus morphology before and after a sagittal split ramus osteotomy.


METHODS
The subjects were 30 patients (60 sides) with mandibular prognathism who had undergone bilateral sagittal split ramus osteotomy setback surgery. The mandibular canal position and ramus morphology were measured at the 3 horizontal planes under the mandibular foramen level (level A), 1 cm lower than level A (level B), and 2 cm lower than level A (level C) preoperatively and 1 year postoperatively by computed tomography.


RESULTS
Postoperative ramus width, lateral distance, lateral marrow distance, and canal length were significantly larger than the preoperative values at the foramen, 1 cm lower, and 2 cm lower. The mandibular canal completely contacted the lateral cortex without lateral bone marrow in 6 sides (10%) in levels A and B and 4 sides (6.7%) in level C preoperatively and 6 sides (10%) in level C postoperatively.


CONCLUSIONS
This study suggested that postoperative mandibular canal position was located more posteriorly and the postoperative lateral bone marrow became thicker compared with the preoperative state.
Ueki
Koichiro
K
Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan. kueki@med.kanazawa-u.ac.jp
Okabe
Katsuhiko
K
Miyazaki
Mao
M
Mukozawa
Aya
A
Marukawa
Kohei
K
Nakagawa
Kiyomasa
K
Yamamoto
Etsuhide
E
D000293:Adolescent; D000328:Adult; D001853:Bone Marrow / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D019248:Jaw Fixation Techniques / Q000295:instrumentation; D008297:Male; D008334:Mandible / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000601:surgery*; D008340:Mandibular Nerve / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D056948:Orthognathic Surgical Procedures; D010027:Osteotomy; D011184:Postoperative Period; D057234:Preoperative Period; D014057:Tomography, X-Ray Computed; D055815:Young Adult