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In Vivo Evaluation of the Mechanical and Viscoelastic Properties of the Rat Tongue

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Changes in masticatory muscles activity associated with Eagle's syndrome.

S Siéssere¹, M Vitti, L G de Sousa

¹Ribeirão Preto School of Dentistry, São Paulo University, Department of Morphology, Stomatology and Physiology, Ribeirão Preto, SP, Brazil.

Electromyography and Clinical Neurophysiology

|August 26, 2006

Summary

Eagle Syndrome causes hyperactivity in masticatory muscles like the masseter and temporalis. This electromyography study found increased muscle activity in affected individuals compared to controls.

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Area of Science:

Neurology
Biomedical Engineering
Dentistry

Background:

Eagle Syndrome involves elongated styloid processes, potentially affecting craniofacial structures.
The stomatognathic system relies heavily on masticatory muscles, which can be impacted by Eagle Syndrome.

Purpose of the Study:

To analyze masseter and temporalis muscle activity in Eagle Syndrome patients using electromyography.
To compare muscle function between individuals with Eagle Syndrome and healthy controls.

Main Methods:

Electromyography (EMG) was used to record muscle activity in 10 women with Eagle Syndrome and 10 healthy controls.
EMG data was collected at rest, during maximum clenching, chewing, mandible laterality, and water swallowing.

Main Results:

Individuals with Eagle Syndrome exhibited hyperactivity in masseter and temporalis muscles across various functions.
An exception was noted in chewing, where the right masseter did not show significantly increased electromyographic activity.

Conclusions:

Eagle Syndrome is associated with masticatory muscle hyperactivity, likely due to styloid process interference.
This hyperactivity contributes to stomatognathic system dysfunctions, including craniofacial pain, dysphagia, and temporomandibular disorders.