Koval Yu. Р.
THE VALUE OF BIOMECHANICAL PROPERTIES "SPEED" AND "STRENGTH" (ACCORDING TO BERNOULLI'S PRINCIPLE) OF THE PTERYGOID MUSCLES IN THE DEVELOPMENT OF PATHOLOGICAL TOOTH ABRASION
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About the author:
Koval Yu. Р.
Heading:
DENTISTRY
Type of article:
Scientific article
Annotation:
The muscles that raise, laterally move and advance the mandible contribute to the development of pathological abrasion of the hard tissues of the teeth. However, only the temporalis and masseter muscles are available for unobstructed external electromyographic examination. Due to their anatomical location, the lateral and medial pterygoid muscles can only be studied using magnetic resonance imaging, determining their physical dimensions, which can be used for further mathematical analysis and knowledge of their biomechanical properties. The Bernoulli principle was applied to further study the influence of the biomechanical properties of these muscles. Its essence is as follows: it is not the cross-sectional area of the muscle that matters but the ratio of length to cross-sectional area. Given the same cross-sectional area, the shorter muscle will be "strong", and the longer one will be "fast". Strong contracts and relaxes slowly, with a low contraction amplitude. The fast one contracts and relaxes rapidly with a high contraction amplitude. We have proposed a formula for calculating the dimensionless coefficient of the Bernoulli principle of the ratio of muscle length to cross-sectional area. The calculated numerical expressions of this coefficient for the lateral and medial pterygoid muscles in individuals without signs of dental hard tissue damage and in patients with pathological tooth abrasion of varying severity were compared. The biomechanical properties of "speed" and "strength" of both pterygoid muscles in each study group were determined. In the control group, the average values of the coefficients of the same-named pterygoid muscles on the priority and secondary sides of mastication differ insignificantly, and the balance between the properties of "speed" and "strength" is maintained. In patients with pathological tooth abrasion, with increasing severity of the disease, both pterygoid muscles acquire the biomechanical property "speed" rather than "strength", which, in combination with the dominant biomechanical property "strength" of the temporalis and masseter muscles, leads to the development of generalised pathological tooth abrasion.
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Bibliography:
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Publication of the article:
«Bulletin of problems biology and medicine», 2024 Issue 1, 172, 502-511 pages, index UDC 611.732.73/74:532.513:616.314 11/15-007.232-02
