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Studying Orthodontic Tooth Movement in Mice
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Neuromuscular function in healthy occlusion.

S E Forrester1, S J Allen, R G Presswood

  • 1Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Loughborough, UK. s.forrester@lboro.ac.uk

Journal of Oral Rehabilitation
|May 25, 2010
PubMed
Summary
This summary is machine-generated.

Maximum masticatory muscle function in healthy adults requires bilateral posterior teeth contacts and a stable jaw position. Anterior teeth contacts significantly reduce both muscle activity and its symmetry during clenching.

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Area of Science:

  • Biomechanics
  • Neuromuscular Physiology
  • Dental Science

Background:

  • Masticatory muscle function is crucial for oral health and overall well-being.
  • Understanding how occlusal conditions influence neuromuscular activity is essential for diagnosing and treating jaw-related disorders.

Purpose of the Study:

  • To quantify masticatory muscle neuromuscular function under various occlusal loading conditions in healthy adults.
  • To investigate the impact of different teeth contacts and mandibular positions on muscle activity and symmetry.

Main Methods:

  • Surface electromyography (sEMG) was used to record muscle activity from key masticatory and auxiliary muscles.
  • Forty-one healthy, dentate adults performed maximum voluntary clenches under nine distinct occlusal conditions.
  • Analysis included muscle function, symmetry coefficients (per cent overlap, anterior-posterior, torque), and muscle activity levels.

Main Results:

  • Occlusal conditions significantly affected masticatory muscle function (P=0.0000).
  • Maximum muscle activity and symmetry were achieved with bilateral posterior teeth contacts in a stable centric mandibular position.
  • Anterior teeth contacts and protruded positions resulted in significantly reduced muscle activity and symmetry.

Conclusions:

  • Optimal masticatory muscle performance during maximum voluntary clenches in healthy individuals is dependent on bilateral posterior occlusal contacts and a stable jaw position.
  • Anterior teeth contacts lead to a significant decrease in both the magnitude and symmetry of masticatory muscle activity.