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1 Brookline Health Department, Brookline, Massachusetts
An orthodontic survey was made on 491 perschool children who were grouped according to socio-economic level and Angle's classification of malocclusion.
No statistically significant relation was found to exist between socio-economic level and type of malocclusion. The relation between incidence of habits and of malocclusion was statistically significant. The positive correlation between incidence of habits and level of socio-economic strata was also significant. Contrary to prevailing information, 71 per cent of the children had no spaces between the anterior deciduous teeth.
Submitted on July 14, 1959
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