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2 - The jaw viewed as a three-dimensional lever

Published online by Cambridge University Press:  05 August 2012

Walter Stalker Greaves
Walter Stalker Greaves
Affiliation:
University of Illinois, Chicago
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Summary

In a two-dimensional jaw mechanism, joint stability requires only that the resultant muscle force be located behind the most posterior tooth. A stable three-dimensional jaw mechanism requires that the resultant force of the jaw muscles be located within a triangle formed by the two jaw joints and the bite point. One consequence of this relationship is that the muscle force cannot be maximized at the rear of the tooth row and bite forces in this region are not as high as might be expected.

The anteroposterior location of the muscle force is 30% of jaw length from the jaw joint. The mediolateral location of the tooth row seems to be essentially the same in many mammals after taking the length and width of the jaw into account.

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The Mammalian Jaw
A Mechanical Analysis
 , pp. 26 - 51
Publisher: Cambridge University Press
Print publication year: 2012

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