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Published on: March 7, 2014
Mathematical model of the human jaw system simulating static biting and movements after unloading
G E Slager1, E Otten, T M van Eijden
1Department of Medical Physiology, University of Groningen, 9712 KZ Groningen, The Netherlands.
Journal of Neurophysiology
|February 7, 1998
Summary
Jaw muscle force-velocity properties primarily limit impact velocity after bite force unloading. This rapid mechanism protects dental elements from damage during unexpected jaw movements.
Area of Science:
- Biomechanics
- Human Physiology
- Musculoskeletal System
Background:
- Sudden unloading of isometric bite force causes rapid jaw movement.
- Reflexes are too slow to limit this impact velocity.
- Understanding factors limiting jaw velocity is crucial for dental protection.
Purpose of the Study:
- To investigate the influence of muscle properties and cocontraction on jaw impact velocity.
- To identify the primary mechanisms limiting velocity during unloading experiments.
- To model the dynamic response of the jaw system.
Main Methods:
- Formulation of a numerical forward dynamic model of the jaw system.
- Simulation of unloading experiments under various conditions.
- Parameterization using physiological data and fitting to experimental results.
Main Results:
- Jaw muscle force-velocity properties are the main determinant of impact velocity limitation.
- Muscle force-length properties have minimal impact on velocity.
- Tendinous compliance is unfavorable, while muscle cocontraction is beneficial for velocity reduction.
Conclusions:
- Force-velocity properties of jaw muscles offer a rapid protective mechanism against dental damage.
- Cocontraction of jaw muscles aids in limiting impact velocity.
- The jaw system's dynamics are complex, involving multiple factors influencing impact speed.
