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Orthodontic Treatment Needs in English Children Aged 11–12 Years

A subjective clinical investigation of the extent of the need for orthodontic treatment in English children aged 11–12 years is described. The sample consisted of 566 boys and 619 girls attending randomly selected schools in Grimsby, England, and included children of all social groups. No significant sex differences were found with respect to either the prevalence of acceptable occlusions or the different basic types of orthodontic treatment required. Approximately 70 per cent required some form of orthodontic treatment; almost 25 per cent required extractions alone and 35·5 per cent required extractions and appliances. It was found that the ratio of removable to fixed appliances for those requiring active treatment was approximately 10: 1.