Changes in length and width of the mandibular arch from the mixed dentition to the completion of the permanent dentition

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Abstract
Summary. The factors that influence the final length of the mandibular arch mesial to the first permanent molars were evaluated in 40 cases of Class I malocclusion with a full complement of permanent teeth. Plaster models recorded in the mixed dentition before treatment; at the end of treatment, and some time after treatment were measured. Correlation coefficients were calculated for all pairings of the inter-canine distance, the anterior length of the arch, the mesio-distal width of deciduous canines and molars, the mesio-distal width of permanent canines and premolars and the original amount of space lack for the mandibular incisors. High negative correlations were found for space reduction for the mandibular incisors and changes in lower canine distance, and Nance's leeway and reduction in total lower arch length. In general, where the lack of space for mandibular incisors exceeds 3.5 mm the results of non-extraction treatment were unsatisfactory.

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