Major factors contributing to anterior and posterior relapse after intraoral vertical ramus osteotomy

Publication date: Available online 23 January 2016
Source:Journal of Cranio-Maxillofacial Surgery
Author(s): Sung-Hwan Choi, Da-Young Kang, Jung-Yul Cha, Young-Soo Jung, Hyung-Seog Yu, Hyung-Sik Park, Chung–Ju Hwang
The aim of this retrospective cohort study was to investigate the factors contributing to mandibular relapse after intraoral vertical ramus osteotomy (IVRO) while controlling for possible confounders. Forty-seven patients who underwent bimaxillary surgery were divided into three groups according to the direction of horizontal mandibular relapse: a stable group (group S), a posterior relapse group (group P), and an anterior relapse group (group A). Lateral cephalograms were analysed 1 month before and at 7 days and 12 months after surgery. One month before surgery, the pogonion in group A was positioned about 13 mm more anteriorly than in group P (P < 0.05). Immediately after surgery, the mandibles in groups A and S had moved about 6 mm more posteriorly than in group P. At 12 months, both the mandibles (point B) and the maxillae (point A) had moved posteriorly in group P (P < 0.05). A multivariate linear regression analysis showed that the amount of setback was the one key factor predicting postoperative mandibular changes 12 months after IVRO. As the amount of setback decreased, mandibular posterior horizontal relapse increased after IVRO. These findings suggest that the amount of setback can be a key factor predicting postoperative mandibular relapse.

from #Medicine-SfakianakisAlexandros via o.lakala70 on Inoreader http://ift.tt/1UkcaOF
via IFTTT

from #Med Blogs by Alexandros G.Sfakianakis via Alexandros G.Sfakianakis on Inoreader http://ift.tt/1ZKJAaT
via IFTTT