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Is There a Difference in Stability After Intraoral Vertical Ramus Osteotomy Between Vertically High-Angle and Normal-Angle Patients?

 Sung-Hwan Choi  ;  Da-Young Kang  ;  Jung-Yul Cha  ;  Young-Soo Jung  ;  Hyoung-Seon Baik  ;  Chung-Ju Hwang 
 Journal of Oral and Maxillofacial Surgery, Vol.74(11) : 2252-2260, 2016 
Journal Title
 Journal of Oral and Maxillofacial Surgery 
Issue Date
Adolescent ; Adult ; Aged ; Aged, 80 and over ; Cephalometry ; Female ; Follow-Up Studies ; Humans ; Male ; Malocclusion, Angle Class III/surgery* ; Mandible/anatomy & histology* ; Mandible/surgery ; Middle Aged ; Osteotomy, Sagittal Split Ramus* ; Recurrence ; Retrospective Studies ; Treatment Outcome ; Vertical Dimension ; Young Adult
PURPOSE: Few studies have evaluated the relapse pattern of intraoral vertical ramus osteotomy (IVRO) for the correction of mandibular prognathism with a high angle. The aim of this study was to measure the association between vertical facial types (high and normal mandibular plane angle) and relapse after IVRO for the management of mandibular prognathism. MATERIALS AND METHODS: The retrospective cohort study sample (skeletal Class III patients) was divided into 2 groups according to the angle of the sella-nasion plane relative to the mandibular plane (SN-MP) at the initial examination. Lateral cephalograms were analyzed for the predictor (facial type) and outcome (cephalometric changes over time) variables before surgery, 7 days after surgery, and 12 months after surgery. The 2 groups were matched for sample size (n = 20 in each). Data were analyzed using repeated-measures analysis of variance with Bonferroni correction. RESULTS: The normal-angle group (group N, SN-MP from 27° to 37°) and high-angle group (group H, SN-MP >37°) were not significantly different in terms of gender and age at the initial examination. Seven days after surgery, the mandibles in group H moved 2.5 mm more superiorly than those in group N (P = .013); consequently, the amount of overbite correction in group H was approximately 2 mm greater than that in group N (P = .002). Nevertheless, 12 months after surgery, there was no statistically significant difference in relapse of the maxilla and mandible between the 2 groups. In the 2 groups, the mandible moved approximately 0.7 mm superiorly during retention. CONCLUSIONS: These findings suggest that IVRO is a clinically acceptable and stable treatment modality for mandibular prognathism with a high angle.
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2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Oral and Maxillofacial Surgery (구강악안면외과학교실) > 1. Journal Papers
Yonsei Authors
백형선(Baik, Hyoung Seon)
정영수(Jung, Young Soo) ORCID logo https://orcid.org/0000-0001-5831-6508
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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