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Proceedings Paper

Adaptive plasticity in mammalian masticatory joints
Author(s): Matthew J. Ravosa; Ravinder Kunwar; Elisabeth K. Nicholson; Emily B. Klopp; Jessie Pinchoff; Stuart R. Stock; M. Sharon Stack; Mark W. Hamrick
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Paper Abstract

Genetically similar white rabbits raised on diets of different mechanical properties, as well as wild-type and myostatin-deficient mice raised on similar diets, were compared to assess the postweaning effects of elevated masticatory loads due to increased jaw-adductor muscle and bite forces on the proportions and properties of the mandibular symphysis and temporomandibular joint (TMJ). Microcomputed tomography (microCT) was used to quantify bone structure at a series of equidistant external and internal sites in coronal sections for a series of joint locations. Discriminant function analyses and non-parametric ANOVAs were used to characterize variation in biomineralization within and between loading cohorts. In both species, long-term excessive loading results in larger joint proportions, thicker articular and cortical bone, and increased biomineralization of hard tissues. Such adaptive plasticity appears designed to maintain the postnatal integrity of masticatory joint systems for a primary loading environment(s). This behavioral signal may be increasingly mitigated in older organisms by the interplay between adaptive and degradative joint tissue responses.

Paper Details

Date Published: 7 September 2006
PDF: 9 pages
Proc. SPIE 6318, Developments in X-Ray Tomography V, 63180D (7 September 2006); doi: 10.1117/12.680580
Show Author Affiliations
Matthew J. Ravosa, Northwestern Univ. (United States)
Ravinder Kunwar, Northwestern Univ. (United States)
Elisabeth K. Nicholson, Northwestern Univ. (United States)
Emily B. Klopp, Northwestern Univ. (United States)
Jessie Pinchoff, Northwestern Univ. (United States)
Stuart R. Stock, Northwestern Univ. (United States)
M. Sharon Stack, Northwestern Univ. (United States)
Mark W. Hamrick, Medical College of Georgia (United States)

Published in SPIE Proceedings Vol. 6318:
Developments in X-Ray Tomography V
Ulrich Bonse, Editor(s)

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