Influence of laterotrusive occlusal scheme on bilateral masseter EMG activity during clenching and grinding
| Autor: | Claudia Zúñiga, María José Campillo, María Javiera Fresno, Rodolfo Miralles, Aler Daniel Fuentes, Hugo Santander, Saúl Valenzuela |
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| Předmět: |
Adult
Male Cuspid Dental Occlusion Centric Adolescent Dentistry Electromyography Group function Body Mass Index Task (project management) Dental Occlusion Young Adult Sex Factors Isometric Contraction Humans Medicine General Dentistry Orthodontics medicine.diagnostic_test Masseter Muscle Occlusal scheme business.industry Dental occlusion Vertical Dimension Molar Grinding Masticatory force Otorhinolaryngology Contact position Bruxism Female business psychological phenomena and processes Muscle Contraction |
| Zdroj: | Scopus-Elsevier |
| Popis: | This study was designed to determine the effect of the occlusal scheme on masseter EMG activity at different jaw posture tasks. The sample included 30 healthy subjects with natural dentition and bilateral molar support, 15 with bilateral canine guidance, and 15 with bilateral group function. An inclusion criterion was that subjects had to be free of signs and symptoms of any dysfunction of the masticatory system. Bipolar surface electrodes were located on the left and right masseter muscles. EMG activity was recorded during the following jaw posture tasks: A. maximal clenching in the intercuspal position; B. grinding from intercuspal position to edge-to-edge lateral contact position; C. maximal clenching in the edge-to-edge lateral contact position; D. grinding from edge-to-edge lateral contact position to intercuspal position. EMG activity in tasks B, C, and D was lower than in task A (mixed model with unstructured covariance matrix). EMG activity was not significantly different with canine guidance or group function. EMG activity recorded on the nonworking side was higher than the working side during task C, and no different between tasks B or D. On the nonworking side, EMG activity in task B was significantly lower than C and D, and similar between task C and D. On the working side, EMG activity was significantly higher in task D than C and B, and in task B significantly higher than task C. The EMG patterns observed could be of clinical importance in the presence of parafunctional habits, i.e., clenching and/or grinding. |
| Databáze: | OpenAIRE |
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