Abstract
The orthodontic situation of 2042 children in 4th to 8th schoolgrades was described by placing each child in 1 of 5 orthodontic categories (percentage refers to observed frequencies): no anomaly (25%), malocclusion.sbd.under observation only (40%), undergoing orthodontic treatment (20%), orthodontic treatment completed (12%) and orthodontic treatment discontinued (3%). The socioeconomic status of the child''s family, determined by the occupation of the father or mother, was described by one of the following 5 terms: Low, lower middle, middle, upper middle and upper socioeconomic group. The distribution of the orthodontic categories within the socioeconomic groups was almost equal, but 3 trends could be noted: a slightly higher frequency of malocclusion in the low socioeconomic group; children from the middle socioeconomic group represented a relatively large part of the orthodontic treatment group and children in the 2 lowest socioeconomic groups showed a greater frequency of discontinued orthodontic treatment than the rest of the children.

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