Evaluation of bone formation after sagittal split ramus osteotomy with bent plate fixation using computed tomography.
OBJECTIVE
To evaluate bone formation between the proximal and distal segments after a sagittal split ramus osteotomy (SSRO) with bent plate fixation.


METHODS
The subjects were 23 patients (46 sides) who underwent bilateral SSRO setback surgery. They were divided into titanium and absorbable plate groups. A 3 to 7-mm gap was made between the proximal and distal segments and a bent plate was fixed with 4 screws in each side of the mandible. The square of ramus (RmS), the anteroposterior length (RmA-RmP), and the mediolateral width (RmM-RmL) of the ramus at the horizontal plane under the mandibular foramen were assessed preoperatively, immediately after surgery, and 1 year postoperatively by computed tomography (CT).


RESULTS
There were no significant differences between the titanium and absorbable plate groups over time. RmS after 1 year was larger than preoperatively in both groups (P < .0001). RmA-RmP significantly increased immediately after surgery and significantly decreased after 1 year in both groups (P < .0001). RmA-RmP after 1 year was significantly larger than the preoperative value in both groups (P < .0001). RmM-RmL showed a similar tendency to the anteroposterior length, but was not significant.


CONCLUSIONS
The gap between the proximal and distal segments can fill with new bone after SSRO with both titanium and absorbable plates, even with few bony contacts between segments.
Ueki
Koichiro
K
Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, Kanazawa, Japan. kueki@med.kanazawa-u.ac.jp
Hashiba
Yukari
Y
Marukawa
Kohei
K
Okabe
Katsuhiko
K
Nakagawa
Kiyomasa
K
Alam
Shamiul
S
Yamamoto
Etsuhide
E
D020341:Absorbable Implants; D000293:Adolescent; D000328:Adult; D001860:Bone Plates; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging / Q000502:physiology / Q000601:surgery*; D010012:Osteogenesis; D010027:Osteotomy; D011091:Polyesters; D011378:Prognathism / Q000000981:diagnostic imaging / Q000601:surgery*; D014025:Titanium; D014057:Tomography, X-Ray Computed; D055815:Young Adult
D011091:Polyesters; C033616:poly(lactide); D014025:Titanium