title: Long-term results of bilateral mandibular distraction osteogenesis using an intraoral tooth-borne device in adult Class II patients.
abstract: The aim of this prospective clinical study was to evaluate the short-term and long-term skeletal and dental changes after mandibular osteodistraction with tooth-borne appliances in adult orthodontic patients. The sample consisted of 10 non-growing Caucasian patients with a Class II skeletal relationship due to mandibular deficiency, together with Class II dental malocclusion. All patients underwent mandibular distraction osteogenesis (MDO) using the ROD1 tooth-borne device. Lateral cephalograms were evaluated at four time intervals: pretreatment (T1), after mandibular distraction (T2), after orthodontic fixed appliance therapy (T3), and at long-term observation 8-year post-distraction (T4). Statistical analyses compared the skeletal and dental changes in intervals T1-T2, T2-T3, T3-T4, T1-T4, and T2-T4. MDO with the ROD1 tooth-borne device produced significant long-term (T1-T4) increases in the SNB angle (2.3°), total mandibular length (5.9mm), and corpus length (4.5mm). Potential adverse sequelae included significant increases in mandibular plane angle (4.3°), lower anterior dental height (2.8mm), and lower posterior dental height (2.5mm). Significant increases in lower incisor proclination occurred during distraction (7.5°). Distraction osteogenesis with tooth-borne appliances offers a minimally invasive surgical method with stable results for correcting mandibular deficiency in non-growing patients.
authors.affiliation: Orthodontics and Biomedical Engineering, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada.
authors.forename: T H
authors.initials: TH
authors.lastname: El-Bialy
authors.forename: Y
authors.initials: Y
authors.lastname: Razdolsky
authors.forename: N D
authors.initials: ND
authors.lastname: Kravitz
authors.forename: S
authors.initials: S
authors.lastname: Dessner
authors.forename: R F
authors.initials: RF
authors.lastname: Elgazzar
mesh_terms: D000328:Adult; D059925:Anatomic Landmarks; D002508:Cephalometry; D005260:Female; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008334:Mandible / Q000002:abnormalities*; D019857:Osteogenesis, Distraction / Q000295:instrumentation*; D011446:Prospective Studies; D013995:Time; D013997:Time Factors
keywords: distraction osteogenesis; long term; mandibular retrognathia; tooth-borne detractor