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Purpose: To characterize the motor control of the masseter and temporal muscles and the morphology of the masseter muscles during mastication in individuals with normal occlusion and to verify the consistency between surface electromyography (sEMG) and ultrasound (USD).
Methods: Participants were 22 adults, of both genders, with no alterations of the oral myofuntional system. The procedures performed included sEMG of the masseter (MM) and temporal (TM) muscles and USD of the MM, each during three tasks: resting condition and maximum voluntary dental clench with and without cotton rolls.
Results: The following statistical tests were used: Kolmogorov-Smirnov, paired t-test and Spearman correlation (significance level of 5%). The sEMG data indicated a significant difference between the MM and TM during the maximum voluntary clench with and without cotton rolls, and the TM was more active than the TM in both clenching tasks. No significant difference was observed between the sides of the face when assessed with sEMG or USD. A significant positive correlation between the exams was observed for the left maximum voluntary dental clench with and without cotton rolls, and a trend toward significance was found for the right maximum dental clench without cotton rolls.
Conclusion: The comparison of sEMG to USD for the investigation of muscle function reveals important information about the physiology of skeletal muscles. The results of the present study suggest a correlation between sEMG and USD, i.e., between increased electrical activity and the corresponding increase in muscle thickness.
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http://dx.doi.org/10.1590/s2179-64912012000300005 | DOI Listing |
Arch Oral Biol
December 2024
School of Health and Life Sciences, Pontifical Catholic University of Rio Grande do Sul, Av. Ipiranga 6681, Porto Alegre, RS 90619-900, Brazil. Electronic address:
Objective: This study aimed to correlate occlusal marks on posterior teeth and cusp tips, recorded using an analog qualitative method, with digital evaluations of masseter and temporal muscle activity through electromyography indexes, comparing two normalization techniques (cotton and wax) using the standardized Percentage Overlap Coefficient of the Anterior Temporal muscle and Percentage Overlap Coefficient of the Masseter muscle indexes.
Design: This is a comparative cross-sectional observational study. Occlusal contact and electromyography records of the anterior temporal and masseter muscles were detected in 30 individuals with an average age of 34.
Gait Posture
February 2025
Department of Sports Medicine, Medical University of Lublin, Chodzki 15, Lublin 20-093, Poland. Electronic address:
Background: Balance disorders are considered a serious diagnostic challenge, with many potential causes. The influence of temporomandibular disorders (TMD) on postural balance has numerous anatomical, biomechanical, physiological and functional argumentation, however, cohort studies on this subject do not give unambiguous results. It is suggested that only some forms of TMD may affect the body balance.
View Article and Find Full Text PDFJ Oral Rehabil
November 2024
Grupo de Investigación Fisioterapia y Salud (FYSA), Departamento de Fisioterapia, Facultad HM de Ciencias de la Salud, Universidad Camilo José Cela, Villanueva de la Cañada, Madrid, Spain.
Background: Current research relates jaw clenching to athletic performance, in terms of force and agility. However, the impact of jaw clenching on sports accuracy is unclear.
Objectives: To analyse the impact of jaw position and chewing type on free-throw accuracy and electromyographic (EMG) activity of masticatory muscles during free-throws.
J Clin Exp Dent
June 2024
Oral Medicine, Department of Diagnosis and Surgery, School of Dentistry, São Paulo State University, (UNESP), Araraquara, São Paulo, Brazil.
Background: This systematic review and meta-analysis aimed to evaluate if rapid maxillary expansion improves the activity of the masticatory muscles (masseter and temporal) in patients with unilateral posterior crossbite.
Material And Methods: Searches were performed in PubMed/MEDLINE, Scopus, Web of Science, Embase, Cochrane Library, and grey literature. A manual search of orthodontic journals was also performed.
Arch Oral Biol
November 2024
Department of Sports Medicine, Faculty of Health Sciences, Medical University of Lublin, 20-093 Lublin, Poland.
Objective: The aim of the study was to determine how the electrical activity of the temporalis, masseter and sternocleidomastoid muscles differs in children with reduced transverse jaw dimension compared to children with normal occlusion.
Design: It was a experimental study. Thirty-seven patients were included in the study.
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