By D. R. Brothwell
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Extra resources for Dental Anthropology. Society for the Study of Human Biology
This vertical overlap usually disappears with wear, leaving an edge-to-edge incisor relation. The enlarged canines project above the general level of the remaining teeth and become interlocking, as indicated in Fig. 1. This has caused many comparative odontologists to deny the possibility of any lateral j a w movement in the great apes, and to state that chewing consists of a purely vertical, champing action. In fact, as Gregory (1916) and Mills (1955) have pointed out, lateral chewing takes place quite normally in the gorilla, as in all the primates.
M (Grewel, 1935; Schultz, 1935, 1940, 1944, 1949, 1950, 1960; Clements and Zuckerman, 1953; Senyurek, 1955, 1956). This distinction in eruption order between early primate and modern man is paralleled by a less dramatic but comparable difference between ape and man. In the great apes, as in the original primate pattern, the second molars commonly precede the second premolars, as typified by the notation M P . In modern man, or more specifically European whites, the second premolars are presumed to erupt before the second molars, hence P M .
FIG. 5. Occlusal view of superimposed upper and lower dentitions of Lemur. in Lemur, and Fig. 6 in Indri. In the latter the occlusion is not completely balanced. As shown in Fig. 6B, the buccal phase commences with the contralateral teeth out of occlusion, and they only come into contact for the last part o f the buccal phase. In considering the most primitive members of the order, OCCLUSION AND MALOCCLUSION IN PRIMATES FIG. 7. Occlusal view of superimposed upper and lower dentitions of Tupaia.
Dental Anthropology. Society for the Study of Human Biology by D. R. Brothwell