Effectiveness of early orthodontic treatment with the Twin-block appliance: a multicenter, randomized, controlled trial. Part 1: Dental and skeletal effects.
This study evaluated the effectiveness of early orthodontic treatment with the Twin-block appliance for the developing Class II Division 1 malocclusion. This multicenter trial was carried out in the United Kingdom. A total of 174 children, aged 8 to 10 years old, with Class II Division 1 malocclusion were randomly allocated to receive treatment with a Twin-block appliance or to an untreated, control group. Data were collected at the start of the study and 15 months later. Results showed that early treatment with Twin-block appliances resulted in reduction of overjet, correction of molar relationships, and reduction in severity of malocclusion. Most of this correction was due to dentoalveolar change, but some was due to favorable skeletal change. Early treatment with the Twin-block appliance is effective in reducing overjet and severity of malocclusion. The small change in the skeletal relationship might not be considered clinically significant.
O'Brien
Kevin
K
Unit of Orthodontics, University Dental Hospital of Manchester, Manchester, 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
D000367:Age Factors; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008445:Maxillofacial Development; D017289:Orthodontic Appliances, Functional; D009972:Orthodontics, Interceptive / Q000295:instrumentation*; D010349:Patient Compliance; D018024:Peer Review, Health Care; D012044:Regression Analysis; D012737:Sex Factors; D016896:Treatment Outcome