[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Triassic traversodont jaw biomechanics



From: Ben Creisler
bcreisler@gmail.com

A new paper with free pdf. Note that the main text is in French.


Lovasoa Ranivoharimanana (2012)
Biomechanical analysis of the jaw apparatus in eucynodont
traversodontids from the Triassic of Madagascar. [Analyse biomécanique
masticatrice chez des traversodontidés eucynodontes du Trias de
Madagascar.]
Geodiversitas 34 (3) : 505-515
http://www.mnhn.fr/museum/foffice/science/science/DocScientifique/publications/presentation/publicationVP.xsp?PUBLICATION_ID=21&idx=25&nav=publication
pdf:
http://www.mnhn.fr/museum/front/medias/publication/46434_g2012n3a3.pdf


Mandible biomechanics analysis cannot take place without the
understanding of the development degree and the arrangement pattern of
the adductor muscles. In the non- mammalian cynodonts, the temporal
and the superficial masseter muscles play a primordial role in the
lower jaw motion during the food processing. They constitute the key
elements of this analysis. Previous studies on non-mammalian cynodonts
including Dadadon isaloi Flynn, Parrish, Rakotosamimanana, Simpson &
Wyss, 1999 and Menadon besairiei Flynn, Parrish, Rakotosamimanana,
Simpson & Wyss, 1999 demonstrated the realization, by these animals,
of a complex dynamic occlusion of the lower and superior postcanine
teeth. The consideration of the bite point as second occlusal fulcrum
equal in status to the cranio-mandibular joint is the basis of the
bifulcral model. This methodology allows: 1) to quantify the
resistance opposed by food at the level of the occlusal site; and 2)
to highlight a positive net vertical load, of compressive nature,
acting to the level of the cranio-mandibular joint during the
interactivity of the elevator muscles, i.e. during mastication.