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Overall activity of all masticatory muscles during lateral excursion
S Yamaguchi1, H Rikimaru, K Yamaguchi
1Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, 980-8575, Japan.
Journal of Dental Research
|December 24, 2005
Summary
Positron emission tomography quantified masticatory muscle activity during jaw movements. The contralateral lateral pterygoid muscle is most crucial for lateral excursion, surpassing other jaw muscles.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Oral Biology
Background:
- Conventional electromyography has limitations in quantifying overall masticatory muscle activity.
- Accurate analysis of stomatognathic function requires comprehensive muscle activity data.
Purpose of the Study:
- To quantify the overall activity of masticatory muscles during lateral excursion using positron emission tomography (PET).
- To evaluate the relative contribution of individual masticatory muscles to lateral excursion.
Main Methods:
- Utilized positron emission tomography (PET) with 18F-fluoro-deoxy-glucose (FDG).
- Measured and quantified muscle activity in all masticatory muscles during lateral excursion.
- Calculated the relative contribution of each muscle to the movement.
Main Results:
- The lateral and medial pterygoid muscles showed greater responsibility for lateral excursion compared to masseter and temporal muscles.
- The contralateral lateral pterygoid muscle was identified as the primary contributor.
- The contralateral medial pterygoid muscle played a significant secondary role.
Conclusions:
- PET imaging provides a method to quantify masticatory muscle activity during jaw function.
- Lateral pterygoid muscles, particularly the contralateral one, are key drivers of lateral mandibular excursion.
- Findings advance the understanding of stomatognathic mechanics and muscle function.
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