Abstract
Design This was a multicentre randomised controlled trial in hospital-based orthodontic practice.
Intervention Children of age 8–10 years who had class II division 1 malocclusion with a minimum 7-mm overjet (measured clinically) and absence of a craniofacial syndrome were randomly allocated to receive treatment with a twin-block appliance or to an untreated, control group if they were willing to take part in the study and had parental approval to do so.
Outcome measure The outcome measures were the antero-posterior relationship of the maxilla to the mandible after treatment, overjet and dental malocclusion, as recorded by the peer assessment rating (PAR).
Results Early treatment with twin-block appliances resulted in reduction of overjet, correction of molar relationships, and reduction in severity of malocclusion (Table 1).
Conclusions 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.
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References
Vig K . One- or two-phase orthodontic treatment for class II malocclusion does not change the occlusal outcome. J Evid Base Dent Pract 2004; 2:142–143.
Chen JY, Will LA, Niederman R . Analysis of efficacy of functional appliances on mandibular growth. Am J Orthod Dentofacial Orthop 2002; 122:470–476.
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Address for correspondence: Professor Kevin O'Brien, Professor and Chair, Orthodontic Unit, University Dental Hospital of Manchester, Manchester M15 6FH, UK. E-mail: kevin.o'brien@man.ac.uk
O'Brien K, Wright J, Conboy F, et al. Effectiveness of early orthodontic treatment with the twin-block appliance: a multicenter, randomized, controlled trial. Part 1: dental and skeletal effects. Am J Orthod Dentofacial Orthop 2003; 124:234–243
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Kalha, A. Early treatment with the twin-block appliance is effective in reducing overjet and severity of malocclusion. Evid Based Dent 5, 102–103 (2004). https://doi.org/10.1038/sj.ebd.6400302
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DOI: https://doi.org/10.1038/sj.ebd.6400302
