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Intraoral Vertical Ramus Osteotomy Results in Good Long-Term Mandibular Stability in Patients With Mandibular Prognathism and Anterior Open Bite

 Sung-Hwan Choi  ;  Jung-Yul Cha  ;  Hyung-Sik Park  ;  Chung-Ju Hwang 
 Journal of Oral and Maxillofacial Surgery, Vol.74(4) : 804-810, 2016 
Journal Title
 Journal of Oral and Maxillofacial Surgery 
Issue Date
Adolescent ; Adult ; Case-Control Studies ; Cephalometry/methods ; Cohort Studies ; Female ; Follow-Up Studies ; Humans ; Jaw Fixation Techniques ; Male ; Malocclusion, Angle Class III/surgery ; Mandible/surgery* ; Mandibular Osteotomy/methods* ; Maxilla/surgery ; Open Bite/surgery* ; Osteotomy, Le Fort/methods ; Physical Therapy Modalities ; Prognathism/surgery* ; Range of Motion, Articular/physiology ; Recurrence ; Retrospective Studies ; Treatment Outcome ; Vertical Dimension ; Young Adult
PURPOSE: Few studies have evaluated the outcomes of intraoral vertical ramus osteotomy (IVRO) for the correction of skeletal Class III malocclusion with an anterior open bite and the potential for postoperative relapse. Therefore, this study evaluated the stability of outcomes of IVRO for mandibular prognathism with and without an anterior open bite. MATERIAL AND METHODS: This retrospective cohort study included consecutive patients with skeletal Class III malocclusion with (AOB group) and without (NAOB group) an anterior open bite who underwent IVRO at Yonsei Dental Hospital (Seoul, Korea). Lateral cephalograms were analyzed for predictor (open bite, yes or no) and outcome (horizontal and vertical relapse in the mandible) variables before and 7 days, 1 year, and 2 years after surgery. Other variables included the patients' demographic characteristics. Data were analyzed using independent t tests, repeated measures analysis of variance, Pearson correlation coefficients, and multiple linear regression analysis. RESULTS: The 2 groups (n = 15 each) were matched for baseline demographic characteristics. During the 2-year postoperative period, anterior and superior mandibular movements were observed in the NAOB group, whereas posterior and superior movements were observed in the AOB group. However, there were no meaningful intergroup differences in horizontal and vertical relapses of the mandible at all time points, although the amount of postoperative inferior relapse increased with a decrease in the amount of initial overbite. CONCLUSIONS: IVRO for the correction of skeletal Class III malocclusion resulted in good postoperative stability over time, regardless of the presence of a preoperative open bite, although the amount of postoperative inferior relapse showed a weak negative correlation with the initial overbite. Thus, IVRO can be a clinically acceptable treatment for skeletal Class III malocclusion with an anterior open bite.
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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)
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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