Abstract
BackgroundThis study evaluated the efficiency of masticatory cycles by means of the linear envelope of the electromyographic signal of the masseter and temporalis muscles in individuals with Parkinson’s disease.Material and MethodsTwenty-four individuals were assigned into two groups: with Parkinson’s disease, average ± SD 66.1 ± 3.3 years (n = 12) and without the disease, average ± SD: 65.8 ± 3.0 years (n = 12). The MyoSystem-I P84 electromyograph was used to analyze the activity of masticatory cycles through the linear envelope integral in habitual mastication of peanuts and raisins and non-habitual mastication of Parafilm M®.ResultsThere was statistically significant difference (P ≤ 0.05) between individuals with Parkinson’s disease and without the disease in non-habitual mastication of Parafilm M®, in the right temporal muscle (P = 0.01); habitual mastication of peanuts, in the right temporal muscle (P = 0.02), left temporal muscle (P = 0.03), and right masseter muscle (P = 0.01); and habitual mastication of raisins in the right temporal muscle (P = 0.001), left temporal muscle (P= 0.001), right masseter muscle (P= 0.001) and left masseter muscle (P= 0.03).ConclusionsThese results suggest that Parkinson’s disease interferes in the electromyographic activity of the masticatory cycles by reducing muscular efficiency. Key words:Parkinson’s Disease, electromyography, masticatory efficiency, masseter muscle, temporal muscle.
Highlights
Parkinson’s disease is a chronic degenerative and progressive disease that produces changes in the central nervous system
The aim was to evaluate the efficiency of masticatory cycles during the chewing of soft and hard foods of Parkinson’s patients compared to individuals without the disease
The efficiency of the masticatory cycle was analyzed after calculating the integral of the linear envelope of the normalized electromyographic signal
Summary
Parkinson’s disease is a chronic degenerative and progressive disease that produces changes in the central nervous system. Previous studies have reported that over 50% of the individuals diagnosed with Parkinson’s disease exhibit eating disorders and dysfunction in the masticatory process [8]; there is little information in the literature about the impact of this disease on the function of the masticatory muscles. The aim was to evaluate the efficiency of masticatory cycles during the chewing of soft and hard foods of Parkinson’s patients compared to individuals without the disease. 12 individuals with Parkinson’s disease (average ± SD 66.1 ± 3.3 years), Angle Class I, contact pattern in maximum intercuspal position with tooth to two tooth occlusion and presence of all permanent teeth (except third molars) were selected (grade I and III of the Hoehn and Yahr Scale). The efficiency of the masticatory cycle was analyzed after calculating the integral of the linear envelope of the normalized electromyographic signal. A Student’s t-test (independent samples), with a significance level of 5% and a 95% confidence interval, was used to determine if there were significant differences between the groups
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