title: Hyrax application as a tooth-borne distractor for maxillary advancement.
abstract: Distraction osteogenesis (DO) has become a mainstream surgical technique for patients with jaw deformities. The aim of this study was to report the use of internal DO in the treatment of maxillary hypoplasia in a patient with cleft lip and palate. The case illustrates a 17-year-old boy with class III malocclusion, maxillary deficiency, and cleft lip and palate. Because the patient was experiencing severe hypernasality, it was decided to treat him by DO. The treatment process began by mounting a hyrax in the upper jaw for lateral expansion. A second hyrax was mounted in a way to create anteroposterior expansion. One day after the second hyrax application, the patient underwent a modified Le Fort I osteotomy. He was instructed to turn the screws twice per day for 12 days. The treatment was continued by means of a conventional face mask for 2 months. After 16 months of active treatment, favorable correction of the skeletal problem was observed. The S-N-A angle increased by 5 degrees, and patient's hypernasality was comprehensively improved.
authors.affiliation: Department of Orthodontics, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Rahman
authors.initials: R
authors.lastname: Showkatbakhsh
authors.forename: Fereydoun
authors.initials: F
authors.lastname: Pourdanesh
authors.forename: Abdolreza
authors.initials: A
authors.lastname: Jamilian
authors.forename: Abolfazl
authors.initials: A
authors.lastname: Ghorbani
authors.forename: Mohammad
authors.initials: M
authors.lastname: Behnaz
mesh_terms: D000293:Adolescent; D002508:Cephalometry; D002971:Cleft Lip / Q000150:complications; D002972:Cleft Palate / Q000150:complications; D005115:Extraoral Traction Appliances; D006801:Humans; D008297:Male; D008313:Malocclusion, Angle Class III / Q000601:surgery / Q000628:therapy; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000002:abnormalities / Q000473:pathology / Q000601:surgery*; D009295:Nasal Bone / Q000473:pathology; D024343:Open Bite / Q000628:therapy; D016382:Orthodontic Appliance Design; D019857:Osteogenesis, Distraction / Q000295:instrumentation*; D019340:Osteotomy, Le Fort / Q000379:methods; D010155:Palatal Expansion Technique / Q000295:instrumentation*; D013064:Speech Disorders / Q000628:therapy; D014087:Tooth Movement Techniques / Q000295:instrumentation / Q000379:methods