This might reflect limitations in the ability of this method to detect diet-related differences, but is also consistent with a lack of differences in functionally relevant aspects of occlusal morphology among chimpanzee subspecies. The baby chimpanzee did not have teeth whereas humans do. Beginning at the front, each quadrant of the mouth has 2 incisors, 1 canine, and varying numbers of premolars and molars. Although differences were noted between wear stages within subspecies in surface slope, relief, and angularity, none were found to distinguish the subspecies from one another in these attributes. High-resolution casts from museum collections were examined by laser scanning, and resulting data were analyzed using GIS algorithms and a two-factor ANOVA model. The nearly identical teeth do not only generate familiar smiles in our primate cousin. Also, earliest proto-human forms, like other primates, had far larger. The dental structure of humans and chimpanzees is strikingly similar. This study uses dental topographic analyses shown to reflect diet-related differences in occlusal morphology among primate species, to assess within-species variation among chimpanzee subspecies. In general, modern humans differ from modern great apes and from earliest proto-human forms in having (1) thicker tooth enamel, (2) differing rates of enamel deposition during the animal's development, and (3) somewhat different forms in individual teeth. And in fact, observations to date of the diets of chimpanzees have not revealed consistent differences among subspecies. Chimpanzee subspecies have been reported to exhibit differences in molar dimensions and nonmetric traits, but these have not been related to differences in their diets. Molar tooth morphology is generally said to reflect a compromise between phylogenetic and functional influences. Box-and-whisker plots depicting AET in human and chimpanzee dental arcades.
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