Anterior open bite correction by Le Fort I osteotomy with or without anterior segmentation: which is more stable?
A retrospective cohort study was conducted to analyze the relapse rate of anterior open bite (AOB) correction comparing Le Fort I osteotomy with and without anterior segmentation. The risk factors that might contribute to relapse were also assessed. Lateral cephalograms obtained at six different times were analyzed. A total of 81 patients with AOB were recruited. Thirty-five patients underwent Le Fort I osteotomy without anterior segmentation and 46 patients underwent anterior segmentation. Le Fort I osteotomy with anterior segmentation resulted in significantly more AOB relapse when compared to that without anterior segmentation at 7 weeks postoperative (15.2% vs. 0%, P=0.016). During the early postoperative period, factors that contributed to AOB relapse in Le Fort I osteotomy with anterior segmentation were AOB closure ≥4mm and inferior positioning of the anterior segment >2mm. Over the long term, AOB closure ≥4mm and intraoral vertical ramus osteotomy as the only mandibular procedure were factors identified as causing more AOB relapse in those treated by Le Fort I osteotomy with anterior segmentation. In conclusion, Le Fort I osteotomy without anterior segmentation was found to be more stable in the surgical correction of AOB in the early and late postoperative periods.
Oral and Maxillofacial Surgery, Faculty of Dentistry, The University of Hong Kong, Hong Kong.
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Ismail
Oral and Maxillofacial Surgery, Faculty of Dentistry, The University of Hong Kong, Hong Kong. Electronic address: mikeyyleung@hku.hk.
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Leung
D002508:Cephalometry; D005260:Female; D006801:Humans; D008297:Male; D024343:Open Bite / Q000601:surgery*; D019340:Osteotomy, Le Fort; D012008:Recurrence; D012189:Retrospective Studies; D012307:Risk Factors; D016896:Treatment Outcome; D055815:Young Adult
Le Fort I osteotomy; anterior open bite; anterior segmentation; cephalometric analysis; maxillary surgery