title: Occlusal stability after extraction orthodontic therapy in adult and adolescent patients.
abstract: In this study we compared the posttreatment stability of occlusion in adults and adolescents treated for crowding or maxillary protrusion with four-premolar extractions and edgewise mechanics at an average of more than 4 years out of treatment. The adolescent sample showed a significantly greater posttreatment increase in mandibular anterior crowding than the adult sample. Posttreatment overjet and overbite remained more stable in the adolescents. We noted a correlation between in-treatment expansion and posttreatment narrowing of mandibular intercanine width in the adults. Differences in postorthodontic occlusal changes were noted between the adult and adolescent samples.
authors.affiliation: Department of Orthodontics, Tokyo Dental College, Tokyo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Miyazaki
authors.forename: E
authors.initials: E
authors.lastname: Motegi
authors.forename: K
authors.initials: K
authors.lastname: Yatabe
authors.forename: Y
authors.initials: Y
authors.lastname: Isshiki
mesh_terms: D000293:Adolescent; D000328:Adult; D002508:Cephalometry / Q000706:statistics & numerical data; D003766:Dental Occlusion; D005500:Follow-Up Studies; D006801:Humans; D008310:Malocclusion / Q000628:therapy; D003765:Models, Dental / Q000706:statistics & numerical data; D009971:Orthodontics, Corrective / Q000706:statistics & numerical data; D011378:Prognathism / Q000628:therapy; D013997:Time Factors; D014081:Tooth Extraction / Q000706:statistics & numerical data