Classification, sex dimorphism, association, and population variation of the canine distal accessory ridge.

Abstract

A newly defined nonmetrical tooth crown characteristic, the distal acces­sory ridge of the upper and lower canines, is described and classified on a six grade scale. An analysis of seven Southwest U.S. Indian and two American white samples shows that this crown trait is sexually dimorphic in terms of frequency and degree of expression. A significant degree of association between the ridge on the upper and lower canines was found in seven of eight samples. Although there are only limited population data available, frequencies for the lower canine distal accessory ridge are significantly higher in Southwest Indians (.53.9%) than in American whites (22.0%) or Asiatic Indians (23.0%)

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