The frequency of hypodontia in orthodontically treated children, both male and female, and the
association between tooth type, the upper or lower arch, the affected side and Angle’s classification were
studied using interviews, oral, study cast and panoramic radiographic examinations of 212 patients with
a mean age of 12 years 7 months.
A hypodontia frequency of 11.3 per cent was found for the total sample. This was higher than the
incidence of hypodontia reported in other studies of orthodontically treated children. The most frequently
missing teeth were the maxillary lateral incisors, and maxillary and mandibular second premolars. The
missing teeth were more often absent on the right (54.2 per cent) than on the left (45.8 per cent) side, in
both males and females. One tooth was absent in 29.2 per cent of patients, two in 58.5 per cent, but seldom
three or more. Orthodontic space closure was the treatment of choice in 87.5 per cent of the subjects.
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