Objectives: The purpose of this study was to obtain the data relating to the growth and development of dental arches during five years after six years of age, which were necessary to design the prediction model for the growth and developmental patterns of dental arches among Korean students. Methods: Eight kinds of representing lengths of dental arch width and depth were measured each year from the landmark of the stone dental arch models of 565 six year-old students from 1995 to 2000, and 82 kinds of cephalometric lengths and 54 kinds of cephalometric angles representing craniofacial depth and height were measured on the lateral cephalograms in 1999. The facial profiles were classified into seven profile groups from cephalograms. Results: The changed eight lengths of dental arch width and depth representing the upper inter-deciduous canine widths had been increased each year for two years after six years of age in all of seven profile groups. Lower inter-deciduous canine widths had been increased each year after six years of age in all profile groups. Upper intermolar widths were continued to increase each year for five years after six years of age in all the other profile groups except the female 'upper prognathic lower prognathic very long profile group'. Upper molar depths were slowly increased each year for four years after six years of age and decreased after ten years of age in all profile groups. Lower molar depths were increased for one year after six years of age in all profile groups. Conclusions: These data could be used to develope the prediction model for growth and developmental pattern of dental arches.

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