Postoperative changes in the pharyngeal airway space through computed tomography evaluation after mandibular setback surgery in skeletal class III patients: 1-year follow-up
강노을, 이대훈, 서자인, 이정근, 송승일,
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강노을 ( Kang No-Eul ) - Ajou University School of Medicine Department of Oral and Maxillofacial Surgery
이대훈 ( Lee Dae-Hun ) - Ajou University School of Medicine Department of Oral and Maxillofacial Surgery
서자인 ( Seo Ja-In ) - Ajou University School of Medicine Department of Oral and Maxillofacial Surgery
이정근 ( Lee Jeong-Keun ) - Ajou University School of Medicine Department of Oral and Maxillofacial Surgery
송승일 ( Song Seung-Il ) - Ajou University School of Medicine Department of Oral and Maxillofacial Surgery
Abstract
Background: This study evaluated the pharyngeal airway space changes up to 1 year after bilateral sagittal split osteotomy mandibular setback surgery and bimaxillary surgery with maxillary posterior impaction through three-dimensional computed tomography analysis.
Methods: A total of 37 patients diagnosed with skeletal class III malocclusion underwent bilateral sagittal split osteotomy setback surgery only (group 1, n = 23) or bimaxillary surgery with posterior impaction (group 2, n = 14). Cone-beam computed tomography scans were taken before surgery (T0), 2 months after surgery (T1), 6 months after surgery (T2), and 1 year after surgery (T3). The nasopharynx (Nph), oropharynx (Oph), hypopharynx (Hph) volume, and anteroposterior distance were measured through the InVivo Dental Application version 5.
Results: In group 1, Oph AP, Oph volume, Hph volume, and whole pharynx volume were significantly decreased after the surgery (T1) and maintained. In group 2, Oph volume and whole pharynx volume were decreased (T2) and relapsed at 1 year postoperatively (T3).
Conclusion: In class III malocclusion patients, mandibular setback surgery only showed a greater reduction in pharyngeal airway than bimaxillary surgery at 1 year postoperatively, and bimaxillary surgery was more stable in terms of airway. Therefore, it is important to evaluate the airway before surgery and include it in the surgical plan.
키워드
Mandibular setback surgery; Bimaxillary surgery; Class III malocclusion; Pharyngeal airway; CBCT
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