title: Rapid-maxillary-expansion induced rhinological effects: a retrospective multicenter study.
abstract: Conventional dental-borne rapid maxillary expansion (RME) leads to a widening of the airways, followed by improved nasal breathing. Although combined skeletal-dental appliances are nowadays being inserted increasingly often and provide a force at the center of resistance in the nasomaxillary complex, no study exists so far that shows whether this treatment may improve the expansionary effect on the airways. In this study, low-dose computed tomography (CT) images from 31 patients (average age 14.63 ± 0.38 years) were examined retrospectively. Both records (T0 = before expansion and T1 = immediately after maximum expansion) were taken in a time interval of 25 days to avoid growth influence. Five patients were treated with Hyrax RME, 6 patients with Hybrid RME, and 20 patients with acrylic cap RME. The total airway volume increased highly significantly (mean +7272.6 mm(3); P < 0.001, power = 0.998), representing an average airway expansion of +11.54 % (2.35 %/mm activation). While the nasopharynx and oropharynx showed highly significant expansion (P < 0.000, power = 0.999), the airway at the laryngopharynx did not change significantly (P > 0.779, power = 0.05). Although the patients were significantly older in the Hybrid RME group (P = 0.006), the positive rhinological effects were comparable within all groups of different appliances (P > 0.316). Hybrid RME may, therefore, be an advisable procedure in patients with nasomaxillary impairment and pronounced patient's age.
authors.affiliation: Department of Orthodontics, Henry M. Goldman School of Dental Medicine, Boston University, Boston, MA, USA.
authors.forename: Melih
authors.initials: M
authors.lastname: Motro
authors.affiliation: Department of Orthodontics, Faculty of Dentistry, Marburg University, Marburg, Germany. schausei@med.uni-marburg.de.
authors.forename: Michael
authors.initials: M
authors.lastname: Schauseil
authors.affiliation: Orthodontic praxis, Traben-Trarbach, Germany.|Department of Orthodontics, Faculty of Dentistry, Homburg University, Homburg, Germany.
authors.forename: Björn
authors.initials: B
authors.lastname: Ludwig
authors.affiliation: Trakya University, 22030, Edirne, Turkey.
authors.forename: Berna
authors.initials: B
authors.lastname: Zorkun
authors.affiliation: Department of Orthodontics, Faculty of Dentistry, Marburg University, Marburg, Germany.
authors.forename: Saskia
authors.initials: S
authors.lastname: Mainusch
authors.affiliation: Department of Orthodontics, Faculty of Dentistry, Marmara University, Istanbul, Turkey.
authors.forename: Mustafa
authors.initials: M
authors.lastname: Ateş
authors.affiliation: Department of Orthodontics, Faculty of Dentistry, Marmara University, Istanbul, Turkey.
authors.forename: Nazan
authors.initials: N
authors.lastname: Küçükkeleş
authors.affiliation: Department of Orthodontics, Faculty of Dentistry, Marburg University, Marburg, Germany.
authors.forename: Heike
authors.initials: H
authors.lastname: Korbmacher-Steiner
mesh_terms: D000293:Adolescent; D058109:Airway Management / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015508:Nasal Obstruction / Q000175:diagnosis / Q000503:physiopathology / Q000628:therapy; D009305:Nasopharynx / Q000000981:diagnostic imaging / Q000503:physiopathology; D009666:Nose / Q000000981:diagnostic imaging / Q000503:physiopathology; D009960:Oropharynx / Q000000981:diagnostic imaging / Q000503:physiopathology; D010155:Palatal Expansion Technique / Q000295:instrumentation / Q000706:statistics & numerical data; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods; D016896:Treatment Outcome
keywords: Airway expansion; Hybrid RME; Orthodontic interdisciplinary treatment; RME; Rapid maxillary expansion
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