Effectiveness of treatment for Class II malocclusion with the Herbst or twin-block appliances: a randomized, controlled trial.
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.
O'Brien
Kevin
K
Unit of Orthodontics, University Dental Hospital of Manchester, United Kingdom. Kevin.O'Brien@man.ac.uk
Wright
Jean
J
Conboy
Frances
F
Sanjie
YeWeng
Y
Mandall
Nicky
N
Chadwick
Stephen
S
Connolly
Ivan
I
Cook
Paul
P
Birnie
David
D
Hammond
Mark
M
Harradine
Nigel
N
Lewis
David
D
McDade
Cathy
C
Mitchell
Laura
L
Murray
Alison
A
O'Neill
Julian
J
Read
Mike
M
Robinson
Stephen
S
Roberts-Harry
Dai
D
Sandler
Jonathan
J
Shaw
Ian
I
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