Abstract
tained it partly through puberty. The craniofacial pattern then appeared to undergo only refinements, not total architectural turnover. 2. The Class II craniofacial complex showed less change early in development, but significant increases in the number of changes from a period beginning before puberty and continuing to late adolescence. Many portions of the Class II craniofacial pattern appeared to change at all age levels, as reflected by the large number of individual counterpart changes for each age level. 3. The Class I sample showed Class II tendencies in some anatomic parts and relationships and Class III tendencies in others. It appears from this study that Class I subjects do not constitute a separate dental classification but, rather, a craniofacial composition that has balanced or compensated for the various maxillary and mandibular protrusive tendencies within their present craniofacial complexes.
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