The dental development of a genetically homogeneous French-Canadian group of children ranging in age from 2.5 to 19 years was evaluated from 5,437 panoramic radiographs by the method of Demirjian et al.8 The maturity of each mandibular tooth was evaluated individually. For each stage of each tooth, the developmental curves of boys and girls were compared. A common pattern was found for each tooth, namely the chronological similarity -between boys and girls in the early stages of development and the advancement of girls over boys for the later stages. Developmental scores were given to the seven mandibular teeth. Up to five to six years of age, no difference was found in the timing of dental development between boys and girls, in contrast to the older ages where girls were always more developedthan boys. When the emergence curve was plottedwith developmental curves, a close relation wasestablished between the stage of formation of all teeth and their emergence, hence the predictive value of the use of dental maturity curves in clinics.
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