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1 Forsyth Dental Center, Harvard School of Dental Medicine, Boston, Massachusetts
Dental age, according to tooth emergence and tooth eruption, was used as a parameter for studying the changes in the intercanine distance, arch length, and available space in 78 maxillary and 70 mandibular dentitions of individuals with normal occlusion in the permanent dentition. This material was complemented by including 48 incomplete series extending only to the eruption of incisors. The findings differed from those scaled on chronologic age and were considered more representative of those occurring in the average child. Marked differences among individuals were noted in dental development, but the variances were not reduced significantly, except for arch length, by grouping on similar stages of tooth eruption, as opposed to chronologic age.
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