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

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• 作者：Sung-Hwan Choi^a ; ¹ ; ^{selfexam@yuhs.ac" class="auth_mail" title="E-mail the corresponding author} ; Da-Young Kang^b ; ¹ ; ^{dalily@hanmail.net" class="auth_mail" title="E-mail the corresponding author} ; Jung-Yul Cha^a ; ² ; ^{jungcha@yuhs.ac" class="auth_mail" title="E-mail the corresponding author} ; Young-Soo Jung^c ; ³ ; ^{ysjoms@yuhs.ac" class="auth_mail" title="E-mail the corresponding author} ; Hyung-Seog Yu^a ; ⁴ ; ^{yumichael@yuhs.ac" class="auth_mail" title="E-mail the corresponding author} ; Hyung-Sik Park^c ; ⁵ ; ^{hspark709@yuhs.ac" class="auth_mail" title="E-mail the corresponding author} ; Chung-Ju Hwang^a ; ^{hwang@yuhs.ac" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Intraoral vertical ramus osteotomy ; Mandibular setback surgery ; Posterior relapse ; Stability
• 刊名：Journal of Cranio-Maxillofacial Surgery
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：44
• 期：4
• 页码：413-420
• 全文大小：738 K

文摘

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.