title: Three-dimensional dental arch and palatal form changes after extraction and nonextraction treatment. Part 1. Arch length and area.
abstract: The purpose of this study was to investigate changes in arch length, arch area, and irregularity index in patients treated with and without premolar extractions. Records collected at pretreatment, at bracket removal, at the end of retention, and 5 years out of retention were examined. Stone casts were mounted on an articulator with an anatomic face-bow and a central wax record, and measurements were made with a 3-dimensional digitizer. In general, the maxillary arch exhibited less relapse tendency than did the mandibular arch for both patient groups. In general, the extraction group showed the same relapse tendency as the nonextraction group.
authors.affiliation: Department of Internal Medicine, University of Innsbruck, Innsbruck, Austria. Dr.Heiser@aon.at
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Heiser
authors.forename: Andreas
authors.initials: A
authors.lastname: Niederwanger
authors.forename: Beatrix
authors.initials: B
authors.lastname: Bancher
authors.forename: Gabriele
authors.initials: G
authors.lastname: Bittermann
authors.forename: Nikolaus
authors.initials: N
authors.lastname: Neunteufel
authors.forename: Siegfried
authors.initials: S
authors.lastname: Kulmer
mesh_terms: D000293:Adolescent; D000328:Adult; D001641:Bicuspid / Q000601:surgery; D002508:Cephalometry; D002648:Child; D003724:Dental Arch / Q000033:anatomy & histology*; D003766:Dental Occlusion; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D003765:Models, Dental; D009971:Orthodontics, Corrective / Q000379:methods* / Q000706:statistics & numerical data; D010159:Palate / Q000033:anatomy & histology; D012044:Regression Analysis; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D014081:Tooth Extraction / Q000706:statistics & numerical data; D016896:Treatment Outcome