The dimensions of the maxillary and mandibular dental arches were measured from 280 subjects aged between 3 and 15 years in a cross-sectional study. The growth changes were examined by means of canonical analysis, a multivariate technique. This technique enabled the dental arches to be treated as biological units, rather than a series of discrete parameters, as is possible using univariate techniques. The results showed that the size and shape of the dental arches changed maximally between the periods 5-7 and 11-13 years of age, These periods correspond to the major phases of permanent tooth eruption.
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