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In Vivo Functional Assessment of Rat Masseter Muscle Following Surgical Creation of a Volumetric Muscle Loss (VML) Injury

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Modulation of masseteric reflexes by simulated mastication.

S Naser-ud-Din¹, P F Sowman, H Dang

¹Discipline of Physiology & Research Centre for Human Movement Control, School of Molecular and Biomedical Science, University of Adelaide, Australia.

Journal of Dental Research

|December 8, 2009

Summary

This summary is machine-generated.

Masticatory muscle reflexes are modulated during chewing, similar to limb muscles. This study found that both periodontal mechanoreceptor and muscle spindle reflexes decrease during simulated chewing movements.

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Area of Science:

Neuroscience
Biomechanics
Human motor control

Background:

Limb muscle reflexes are known to be modulated during human movements.
However, the modulation of masticatory muscle reflexes during chewing remains largely unknown.

Purpose of the Study:

To investigate the modulation of masticatory muscle reflexes during simulated chewing.
To test the hypothesis that these reflexes are modulated to ensure smooth masticatory movements.

Main Methods:

Studied inhibitory reflexes (periodontal mechanoreceptor activation) and excitatory reflexes (muscle spindle activation).
Used mechanical taps on incisors in 28 participants, measuring masseteric electromyogram responses.
Differentiated reflex components using periodontal anesthesia.

Main Results:

Both periodontal mechanoreceptor-mediated and muscle spindle-mediated reflexes were reduced during simulated masticatory movements.
This suggests a coordinated modulation of different sensory inputs during chewing.

Conclusions:

Masticatory reflexes are indeed modulated during chewing, supporting the hypothesis.
This modulation likely contributes to the smooth execution of masticatory movements.