Skeletal stability after mandibular setback surgery: bicortical fixation using a 2.0-mm locking plate system versus monocortical fixation using a nonlocking plate system.
OBJECTIVE
This study was conducted to compare the time-course changes in condylar long-axis and skeletal stability after sagittal split ramus osteotomy (SSRO) with bicortical plate fixation versus monocortical plate fixation.


METHODS
Of a group of 40 Japanese patients diagnosed with mandibular prognathism, 20 underwent SSRO with bicortical plate fixation using a locking plate system and the other 20 underwent SSRO with monocortical plate fixation using a conventional plate system. The time-course changes in condylar long-axis and skeletal stability were assessed through axial, frontal, and lateral cephalograms.


RESULTS
Significant differences were found between the 2 groups in changes of the left condylar angle between the initial and 1-month measurements (P = .0454) and in ANB between the 1- and 3-month measurements (P = .0206); however, no significant differences were found between the 2 groups in the other measurements in each time interval.


CONCLUSIONS
Our findings suggest no significant differences in postoperative time-course changes between bicortical plate fixation using a locking plate system and monocortical plate fixation using a conventional plate system.
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
Alam
Shamiul
S
Nakagawa
Kiyomasa
K
Yamamoto
Etsuhide
E
D000293:Adolescent; D000328:Adult; D001860:Bone Plates; D002508:Cephalometry; D004867:Equipment Design; D005260:Female; D006801:Humans; D019248:Jaw Fixation Techniques / Q000295:instrumentation*; D008297:Male; D008334:Mandible / Q000601:surgery*; D019647:Oral Surgical Procedures / Q000295:instrumentation*; D010027:Osteotomy / Q000295:instrumentation; D011378:Prognathism / Q000601:surgery*; D055502:Secondary Prevention