title: Condyle displacement associated with premolar extraction and nonextraction orthodontic treatment of Class I malocclusion.
abstract: This study assessed condyle position change with premolar extraction and nonextraction orthodontic treatment in Class I malocclusions. Axially corrected pretreatment and posttreatment tomograms were obtained in 22 extraction and 13 nonextraction cases. Tomographic images were randomized and blinded for joint space measurement. A total of 27 linear anterior, superior, and posterior joint spaces were obtained from each tomogram and averaged. Comparisons of pretreatment and posttreatment joint spaces between groups were done by t test (pool variance estimate) with p < 0.05. Left and right anterior joint spaces were significantly increased during orthodontic treatment of the nonextraction group. No other significant changes in condyle position were determined in either group. There were no significant correlations between mean joint space changes with length of Class II elastic wear. There was no significant difference in condyle position change with extraction space closure using closing arch wires compared with elastic chain.
authors.affiliation: University of Alberta, Faculty of Dentistry, Edmonton, Canada.
authors.forename: P
authors.initials: P
authors.lastname: Major
authors.forename: L
authors.initials: L
authors.lastname: Kamelchuk
authors.forename: B
authors.initials: B
authors.lastname: Nebbe
authors.forename: G
authors.initials: G
authors.lastname: Petrikowski
authors.forename: K
authors.initials: K
authors.lastname: Glover
mesh_terms: D000293:Adolescent; D000328:Adult; D001641:Bicuspid / Q000601:surgery*; D003970:Diastema / Q000628:therapy; D005260:Female; D006801:Humans; D008297:Male; D008311:Malocclusion, Angle Class I / Q000628:therapy*; D008335:Mandibular Condyle / Q000000981:diagnostic imaging / Q000473:pathology*; D009967:Orthodontic Appliances; D009969:Orthodontic Wires; D012690:Serial Extraction; D016037:Single-Blind Method; D013704:Temporomandibular Joint / Q000000981:diagnostic imaging / Q000473:pathology; D013997:Time Factors; D014057:Tomography, X-Ray Computed; D014087:Tooth Movement Techniques