title: Sagittal airway changes: rapid palatal expansion versus Le Fort I osteotomy during maxillary protraction.
abstract: The purpose of the present study was to evaluate upper airway changes related to craniofacial changes induced by a facemask (FM) combined with Le Fort I osteotomy without down-fracture in Class III maxillary retrusion subjects (group 1) when compared with a similar group of subjects treated with traditional rapid palatal expansion and FM therapy. Pre- (T1) and post- (T2) protraction cephalometric radiographs of group 1 (10 females and 6 males; mean age 12.75 ± 1.91 years) and group 2 (7 females and 9 males; mean age 12 ± 1.7 years) were traced. The treatment duration was 149 ± 14 days (approximately 5 months) and 270 ± 46 days (approximately 9 months) for groups 1 and 2, respectively. A paired t-test for intergroup comparisons of values at T1, an independent samples t-test for intragroup comparisons of values at T1 and T2, and a non-parametric Mann-Whitney U-test for intergroup comparisons were used. To evaluate the relationship between changes in upper airway dimension and craniofacial morphology, a multiple-regression analysis was performed. Significant maxillary protraction along with clockwise rotation of the mandible was achieved in both groups. Counter-clockwise maxillary rotation was significant in group 1 (P < 0.05) but not in group 2. While nasopharyngeal measurements (PNS-ad1, PNS-ad2) showed significant increases (P < 0.05) as a result of treatment in both groups, oropharyngeal measurements did not change. Maxillary protraction, which was achieved in both groups but in a shorter period of time in group 2, improved nasopharyngeal but not oropharyngeal airway dimensions.
authors.affiliation: Department of Orthodontics, Faculty of Dentistry, Marmara University, Istanbul. bcakirer@marmara.edu.tr
authors.forename: Banu
authors.initials: B
authors.lastname: Cakirer
authors.forename: Nazan
authors.initials: N
authors.lastname: Kucukkeles
authors.forename: Sirin
authors.initials: S
authors.lastname: Nevzatoglu
authors.forename: Tamer
authors.initials: T
authors.lastname: Koldas
mesh_terms: D000293:Adolescent; D002508:Cephalometry; D002648:Child; D063169:Dentofacial Deformities / Q000628:therapy; D005115:Extraoral Traction Appliances; D005260:Female; D006801:Humans; D008297:Male; D008313:Malocclusion, Angle Class III / Q000473:pathology / Q000628:therapy*; D008437:Maxilla / Q000002:abnormalities; D063166:Maxillary Osteotomy / Q000379:methods*; D008445:Maxillofacial Development; D009305:Nasopharynx / Q000033:anatomy & histology*; D009960:Oropharynx / Q000033:anatomy & histology*; D019340:Osteotomy, Le Fort / Q000379:methods; D010155:Palatal Expansion Technique; D012044:Regression Analysis; D063173:Retrognathia / Q000628:therapy; D018709:Statistics, Nonparametric; D013997:Time Factors