An attempt to predict tooth crown height using cementoenamel junction diameters and implications in the quantitative study of dental wear

Dental morphology changes dramatically across the artiodactyl-cetacean transition, and it is generally assumed that this reflects the evolutionary change from herbivory and omnivory to carnivory. To test hypotheses regarding tooth function and diet, we studied size and position of wear facets on the lower molars and the stable isotopes of enamel samples. We found that nearly all investigated Eocene cetaceans had dental wear different from typical wear in ungulates and isotope values indicating that they hunted similar prey and processed it similarly. The only exception is the protocetid Babiacetus, which probably ate larger prey with harder skeletons. The closest relative of cetaceans, the raoellid artiodactyl Indohyus, had wear facets that resemble those of Eocene cetaceans more than they do facets of basal artiodactyls. This is in spite of Indohyus's tooth crown morphology, which is unlike that of cetaceans, and its herbivorous diet, as indicated by stable isotopes. This implies that the evolution of masticatory function preceded that of crown morphology and diet at the origin of cetaceans.

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Estimating canine tooth crown height in early Australopithecus

Journal of Human Evolution ◽

10.1016/j.jhevol.2009.04.005 ◽

2009 ◽

Vol 57 (1) ◽

pp. 2-10 ◽

Cited By ~ 10

Author(s):

J. Michael Plavcan ◽

Carol V. Ward ◽

Faydre L. Paulus

Keyword(s):

Tooth Crown ◽

Crown Height ◽

Canine Tooth

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Coevolution of Tooth Crown Height and Diet in Oreodonts (Merycoidodontidae, Artiodactyla) Examined with Phylogenetically Independent Contrasts

Journal of Mammalian Evolution ◽

10.1007/s10914-005-9001-3 ◽

2006 ◽

Vol 13 (1) ◽

pp. 11-36 ◽

Cited By ~ 54

Author(s):

Matthew C. Mihlbachler ◽

Nikos Solounias

Keyword(s):

Independent Contrasts ◽

Tooth Crown ◽

Crown Height ◽

Phylogenetically Independent Contrasts

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Molar crown height as a means of evaluating existing dental wear scales for estimating age at death in human skeletal remains

Journal of Archaeological Science ◽

10.1016/s0305-4403(95)80151-0 ◽

1995 ◽

Vol 22 (5) ◽

pp. 659-670 ◽

Cited By ~ 40

Author(s):

Simon Mays ◽

Concepcion de la Rua ◽

Theya Molleson

Keyword(s):

Skeletal Remains ◽

Age At Death ◽

Crown Height ◽

Human Skeletal Remains ◽

Dental Wear

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Electron-Mirror Microscopic Aspects of Ferroelectric Domains of BaTiO3 And Ca2Sr (C2H5CO2)6

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100069387 ◽

1970 ◽

Vol 28 ◽

pp. 478-479

Author(s):

Teruo Someya ◽

Jinzo Kobayashi

Keyword(s):

Surface Layer ◽

Electric Fields ◽

Quantitative Study ◽

Recent Progress ◽

Ferroelectric Domain ◽

Resolving Power ◽

Surface Pattern ◽

Crystal Surfaces ◽

One Dimensional ◽

Ferroelectric Domains

Recent progress in the electron-mirror microscopy (EMM), e.g., an improvement of its resolving power together with an increase of the magnification makes it useful for investigating the ferroelectric domain physics. English has recently observed the domain texture in the surface layer of BaTiO3. The present authors ) have developed a theory by which one can evaluate small one-dimensional electric fields and/or topographic step heights in the crystal surfaces from their EMM pictures. This theory was applied to a quantitative study of the surface pattern of BaTiO3).

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