Electromyographic activity during awake tooth grinding tasks at different jaw posture in the sagittal plane
Author
dc.contributor.author
Fuentes del Campo, Aler
Author
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Martínez, Karin
es_CL
Author
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Miralles Lozano, Rodolfo Isaac
es_CL
Author
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Gutiérrez, Mario Felipe
es_CL
Author
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Santander, Hugo
es_CL
Author
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Fresno Rivas, María Javiera
es_CL
Author
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Valenzuela Fernández, Saul
es_CL
Admission date
dc.date.accessioned
2014-01-27T14:53:09Z
Available date
dc.date.available
2014-01-27T14:53:09Z
Publication date
dc.date.issued
2013
Cita de ítem
dc.identifier.citation
Acta Odontologica Scandinavica, 2013; 71: 917–922
en_US
Identifier
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DOI: 10.3109/00016357.2012.734418
Identifier
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https://repositorio.uchile.cl/handle/2250/123515
General note
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Artículo de publicación ISI
en_US
Abstract
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Objective. The goal of this study was to evaluate the electromyographic (EMG) activity of the anterior temporalis, suprahyoid,
infrahyoid and trapezius muscles during tooth grinding at different jaw posture tasks. Materials and methods. Participants
were 30 healthy subjects with natural dentition, bilateral molar support and incisive protrusive guidance. Bipolar surface
electrodes were located on the right side of the subject. EMG recordings were performed in the following tasks: (A) Eccentric
grinding from intercuspal position to protrusive edge-to-edge contact position; (B) concentric grinding from protrusive edgeto-
edge contact position to intercuspal position; (C) eccentric grinding from intercuspal position to the maximum voluntary
retrusive position; and (D) concentric grinding from the maximum voluntary retrusive position to intercuspal position. The
results were analyzed statistically by Friedman test and Wilcoxon signed rank-sum test. Results. EMG activity in the anterior
temporalis and infrahyoid muscles was significantly higher during task C than the other tasks. EMG activity in the suprahyoid
muscles was significantly higher during task C than task D.EMGactivity in the trapezius muscle was significantly higher during
task C than tasks A and B. Conclusions. The higher EMG activity recorded in task C could become important when its
frequency, duration and magnitude are enough to exceed the adaptation capability of the individual.