Molar Wear Patterns in Macaca Fascicularis, Presbytis Cristatus and Presbytis Rubicunda: A Photogrammetric Analysis
Teaford, Mark Franklyn
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https://hdl.handle.net/2142/70686
Description
Title
Molar Wear Patterns in Macaca Fascicularis, Presbytis Cristatus and Presbytis Rubicunda: A Photogrammetric Analysis
Author(s)
Teaford, Mark Franklyn
Issue Date
1981
Department of Study
Anthropology
Discipline
Anthropology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Anthropology, Physical
Abstract
Investigations into the relationship between molar form and function provided the theoretical basis for this investigation. The basic thesis can be summarized as follows: given that molar form is important in food-processing, and given that molar form changes with wear, animals with different diets might be expected to show differences in tooth wear related to their differences in diet.
Skeletal samples of Macaca fascicularis, Presbytis cristatus, and Presbytis rubicunda from the Museum of Comparative Zoology at Harvard University were used as longitudinal models to test this hypothesis. Stereophotographs of each skeletal specimen were analyzed in a photogrammetric plotter, ultimately yielding X, Y, and Z coordinates for each point of interest on the occlusal surfaces of M(,1) and M(,2). These coordinates were used to compute areas of dentin exposure on the protoconid and hypoconid and shearing-crest lengths on the buccal and lingual sides of the occlusal surface. Bartlett's Three Group Method and Least Squares Regression were the methods of data analysis. Two types of bivariate relationships were examined: (1) dentin exposure on M(,2) versus that on M(,1) and (2) shearing-crest length versus molar wear.
The relationship between dentin exposure on M(,2) and that on M(,1) proved to be different not only for macaques and langurs, but also for the different species of langurs. The relationships between shearing-crest lengths and wear documented interspecific differences in unworn crest lengths along with a few differences in wear-related changes in shearing-crest length. Unfortunately, many of the differences in wear-related shape changes were difficult to interpret. Nonetheless, those differences that were clearly demonstrated seemed to be related to dietary differences between the species.
These results were used to outline a number of cautions for future analyses. First, the combination of Least Squares Regression and the t-test is generally a more powerful means of documenting intergroup differences than Bartlett's Three Group Method and the t-test. Second, broad dietary categorizations should be used carefully in dental investigations as each category may mask a great deal of information. Finally, animals of the same genera may exhibit important dental/dietary differences.
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