title: Changes in difficult airway predictors following mandibular setback surgery.
abstract: The aim of this study was to determine the effect of surgical mandibular backward movements on the predictors of a difficult airway. Thirty-seven skeletal class III patients were included in this study. The Mallampati score, body mass index (BMI), maximal inter-incisal distance, and thyromental and sternomental distances of these patients were evaluated preoperatively and at 6 months and 2 years postoperatively. A sagittal split ramus osteotomy (SSRO) without genioplasty was performed in all patients by the same surgical team, and anaesthesia was provided by the same anaesthesiologist using nasotracheal intubation. The paired samples t-test and Wilcoxon signed-rank test were used for statistical comparisons of the data. There were no statistically significant changes in BMI or sternomental and thyromental distances after SSRO. The maximal inter-incisal distance was significantly reduced at 6 months postoperatively (P<0.05), but no statistical difference was found between the values obtained preoperatively and at 2 years postoperative. A statistically significant increase in Mallampati score was observed postoperatively (P<0.05). Both the patient and practitioner should be aware of the risks associated with an increased postoperative Mallampati score in mandibular setback patients. The amount of mandibular setback in skeletal class III patients with a high preoperative Mallampati score should be limited to prevent potential postoperative airway problems.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Baskent University, Ankara, Turkey.
authors.forename: S S
authors.initials: SS
authors.lastname: Soydan
authors.affiliation: Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Baskent University, Ankara, Turkey.
authors.forename: B
authors.initials: B
authors.lastname: Bayram
authors.affiliation: Department of Orthodontics, Faculty of Dentistry, Baskent University, Ankara, Turkey. Electronic address: bsakdeniz@hotmail.com.
authors.forename: B S
authors.initials: BS
authors.lastname: Akdeniz
authors.affiliation: Department of Anaesthesiology, Faculty of Medicine, Baskent University, Ankara, Turkey.
authors.forename: Z
authors.initials: Z
authors.lastname: Kayhan
authors.affiliation: Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Medipol University, Istanbul, Turkey.
authors.forename: S
authors.initials: S
authors.lastname: Uckan
mesh_terms: D005260:Female; D006801:Humans; D007442:Intubation, Intratracheal; D008297:Male; D008313:Malocclusion, Angle Class III / Q000601:surgery*; D059229:Osteotomy, Sagittal Split Ramus; D011237:Predictive Value of Tests; D018570:Risk Assessment; D012307:Risk Factors; D016896:Treatment Outcome; D055815:Young Adult
keywords: Mallampati score; difficult airway predictors; orthognathic surgery; sagittal split ramus osteotomy