Abstract
This case study describes a new method using a fiber optic Bragg grating sensor to determine muscle fatigue in a patient wearing a resilient occlusal device for the treatment of bruxism symptoms. Four tasks performed at maximum bite force induced rapid exhaustion for the analysis of fatigue. The results show that it is possible to obtain a better understanding of the muscle fatigue process by using the fiber sensor. Differences between the bite patterns are detected at each phase of the induced fatigue. It is possible to compare the bite peak sensitivity coefficients for the exhaustion phase, 1.37Â Ns -1 , and for fatigue phase, 2.54Â Ns -1 . Additionally, the increase in the facial thermal profile is correlated to the different bite force pattern performed.
Highlights
Bruxism is a motor disorder of sleep characterized by increased muscular activity of the masseter and temporalis muscles, causing grinding and abrasion of dental tissues [1]
In the results presented at our study, there was an increase of the temperature with the use of the occlusal device and with the induction of masticatory activity; the maximum temperature variation obtained was of 1.1 °C; so these results are in agreement with the literature
We demonstrated a new method in order to investigate the process of muscle fatigue in parafunctional patients using fiber Bragg gratings
Summary
Bruxism is a motor disorder of sleep characterized by increased muscular activity of the masseter and temporalis muscles, causing grinding and abrasion of dental tissues [1]. Muscle fatigue is related to an increase in the metabolites concentration and changes in both speed of conduction of the muscle fibers and the number of recruited motor units [17]. It is related as a predisposing factor of headaches and facial muscle pain presented by the patients. The response of the muscle to fatigue is translated into an increased number of the motor units recruited, and/or in its synchronization This behavior is intended to compensate for the reduced ability to generate force by motor units. These changes can be associated with the variations of temperature; the infrared thermography images were acquired
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