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

 Sung-Hwan Choi  ;  Da-Young Kang  ;  Jung-Yul Cha  ;  Young-Soo Jung  ;  Hyung-Seog Yu  ;  Hyung-Sik Park  ;  Chung-Ju Hwang 
 Journal of Cranio-maxillo-facial Surgery, Vol.44(4) : 413-420, 2016 
Journal Title
 Journal of Cranio-maxillo-facial Surgery 
Issue Date
Cephalometry ; Humans ; Jaw Fixation Techniques ; Mandible/surgery ; Mandibular Osteotomy/adverse effects ; Mandibular Osteotomy/methods* ; Osteotomy, Sagittal Split Ramus/adverse effects* ; Osteotomy, Sagittal Split Ramus/methods* ; Prognathism/surgery ; Recurrence ; Retrospective Studies
Intraoral vertical ramus osteotomy ; Mandibular setback surgery ; Posterior relapse ; Stability
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.
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2. College of Dentistry (치과대학) > Dept. of Oral and Maxillofacial Surgery (구강악안면외과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
박형식(Park, Hyung Sik)
유형석(Yu, Hyung Seog) ORCID logo https://orcid.org/0000-0002-1275-5078
차정열(Cha, Jung Yul)
최성환(Choi, Sung Hwan) ORCID logo https://orcid.org/0000-0002-1150-0268
황충주(Hwang, Chung Ju) ORCID logo https://orcid.org/0000-0003-3024-4551
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