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Condylar Degradation from Decreased Occlusal Loading following Masticatory Muscle Atrophy.


ABSTRACT:

Objective

The masticatory muscles are the most important contributor to bite force, and the temporomandibular joint (TMJ) receives direct occlusal loading. The present study aimed to investigate condylar remodeling after masseter muscle atrophy in rats.

Methods

Sixty 5-week-old female Sprague-Dawley rats were divided into the following 3 groups: the control group, soft diet (SD) group, and botulinum toxin (BTX) group. The cross-sectional area (CSA) of the masseter muscles was investigated as well as atrogin-1/MuRF-1 expression. Changes in the condylar head were evaluated by H-E, toluidine blue staining, and contour measurements. The biomechanical sensitive factors PTHrP Ihh, Col2a1, and ColX of condylar cartilage were detected by immunohistochemical staining and western blotting. Furthermore, micro-CT and tartrate-resistant acid phosphatase (TRAP) staining were performed to determine the osteopenia in subchondral bone.

Results

The histological and protein analysis demonstrated muscle hypofunction in the SD and BTX groups. Condylar cartilage contour was diminished due to different treatments; the immunohistochemistry and protein examination showed that the expressions of PTHrP, Ihh, Col2a1, and ColX were suppressed in condylar cartilage. A steady osteoporosis in subchondral bone was found only in the BTX group.

Conclusion

The current results suggested that a steady relationship between muscular dysfunction and condylar remodeling exists.

SUBMITTER: Shi Z 

PROVIDER: S-EPMC5994330 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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Publications

Condylar Degradation from Decreased Occlusal Loading following Masticatory Muscle Atrophy.

Shi Zhan Z   Lv Jin J   Xiaoyu Liu L   Zheng Li Wu LW   Yang Xue-Wen XW  

BioMed research international 20180527


<h4>Objective</h4>The masticatory muscles are the most important contributor to bite force, and the temporomandibular joint (TMJ) receives direct occlusal loading. The present study aimed to investigate condylar remodeling after masseter muscle atrophy in rats.<h4>Methods</h4>Sixty 5-week-old female Sprague-Dawley rats were divided into the following 3 groups: the control group, soft diet (SD) group, and botulinum toxin (BTX) group. The cross-sectional area (CSA) of the masseter muscles was inve  ...[more]

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