title: Effectiveness of treatment for Class II malocclusion with the Herbst or twin-block appliances: a randomized, controlled trial.
abstract: The aim of this study was to evaluate the effectiveness of Herbst and Twin-block appliances for established Class II Division I malocclusion. The study was a multicenter, randomized clinical trial carried out in orthodontic departments in the United Kingdom. A total of 215 patients (aged 11-14 years) were randomized to receive treatment with either the Herbst or the Twin-block appliance. Treatment with the Herbst appliance resulted in a lower failure-to-complete rate for the functional appliance phase of treatment (12.9%) than did treatment with Twin-block (33.6%). There were no differences in treatment time between appliances, but significantly more appointments (3) were needed for repair of the Herbst appliance than for the Twin-block. There were no differences in skeletal and dental changes between the appliances; however, the final occlusal result and skeletal discrepancy were better for girls than for boys. Because of the high cooperation rates of patients using it, the Herbst appliance could be the appliance of choice for treating adolescents with Class II Division 1 malocclusion. The trade-off for use of the Herbst is more appointments for appliance repair.
authors.affiliation: Unit of Orthodontics, University Dental Hospital of Manchester, United Kingdom. Kevin.O'Brien@man.ac.uk
authors.forename: Kevin
authors.initials: K
authors.lastname: O'Brien
authors.forename: Jean
authors.initials: J
authors.lastname: Wright
authors.forename: Frances
authors.initials: F
authors.lastname: Conboy
authors.forename: YeWeng
authors.initials: Y
authors.lastname: Sanjie
authors.forename: Nicky
authors.initials: N
authors.lastname: Mandall
authors.forename: Stephen
authors.initials: S
authors.lastname: Chadwick
authors.forename: Ivan
authors.initials: I
authors.lastname: Connolly
authors.forename: Paul
authors.initials: P
authors.lastname: Cook
authors.forename: David
authors.initials: D
authors.lastname: Birnie
authors.forename: Mark
authors.initials: M
authors.lastname: Hammond
authors.forename: Nigel
authors.initials: N
authors.lastname: Harradine
authors.forename: David
authors.initials: D
authors.lastname: Lewis
authors.forename: Cathy
authors.initials: C
authors.lastname: McDade
authors.forename: Laura
authors.initials: L
authors.lastname: Mitchell
authors.forename: Alison
authors.initials: A
authors.lastname: Murray
authors.forename: Julian
authors.initials: J
authors.lastname: O'Neill
authors.forename: Mike
authors.initials: M
authors.lastname: Read
authors.forename: Stephen
authors.initials: S
authors.lastname: Robinson
authors.forename: Dai
authors.initials: D
authors.lastname: Roberts-Harry
authors.forename: Jonathan
authors.initials: J
authors.lastname: Sandler
authors.forename: Ian
authors.initials: I
authors.lastname: Shaw
mesh_terms: D000293:Adolescent; D002508:Cephalometry; D002648:Child; D017050:Episode of Care; D005260:Female; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D017289:Orthodontic Appliances, Functional; D009968:Orthodontic Appliances, Removable; D009971:Orthodontics, Corrective / Q000295:instrumentation*; D010349:Patient Compliance; D012044:Regression Analysis; D012923:Social Class; D013131:Spine / Q000254:growth & development; D011795:Surveys and Questionnaires; D013997:Time Factors