Effect of natural mediotrusive contact on electromyographic activity of jaw and cervical muscles during chewing

Aler Daniel Fuentes, Rodolfo Miralles, Hugo Santander, Mario Felipe Gutiérrez, Ricardo Bull, Conchita Martin

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Objective. This study evaluated the effect of a natural mediotrusive contact on the electromyographic (EMG) activity of the anterior temporalis and sternocleidomastoid muscles during chewing in healthy subjects. Materials and methods. The study sample included two groups of 15 subjects each (Group 1: with natural mediotrusive contact; Group 2: without natural mediotrusive contact). Bilateral surface EMG activity was recorded on anterior temporalis and sternocleidomastoid muscles during unilateral chewing of a half cookie and unilateral chewing of a piece of apple. Anterior temporalis and sternocleidomastoid muscle activity was normalized against activity recorded during maximal voluntary clenching in intercuspal position and maximal intentional isometric head-neck rotation to each side, respectively. The partial and total asymmetry indexes were also calculated. Data were analyzed using Mann-Whitney, Wilcoxon and unpaired t-test. Results. EMG activity of anterior temporalis and sternocleidomastoid muscles showed no significant difference between the groups. EMG activity of anterior temporalis was similar between working and non-working sides during chewing in both groups. EMG activity of sternocleidomastoid muscle was higher in the working side than in the non-working side in Group 2 subjects. Asymmetry indexes were not significantly different between groups. Conclusions. The similar EMG pattern and asymmetry indexes observed suggest the predominance of central nervous control over peripheral inputs on anterior temporalis and sternocleidomastoid motor neuron pools.

Original languageEnglish
Pages (from-to)626-632
Number of pages7
JournalActa Odontologica Scandinavica
Volume73
Issue number8
DOIs
StatePublished - 2015
Externally publishedYes

Bibliographical note

Funding Information:
The authors wish to express their gratitude to all the volunteers and staff at the Oral Physiology Laboratory, Faculty of Medicine, University of Chile. We also gratefully acknowledge the financial support from the Faculty of Dentistry, University of Chile.

Publisher Copyright:
© 2015 Informa Healthcare.

Keywords

  • Electromyography
  • Mastication
  • Masticatory muscles
  • Neck muscles

Fingerprint

Dive into the research topics of 'Effect of natural mediotrusive contact on electromyographic activity of jaw and cervical muscles during chewing'. Together they form a unique fingerprint.

Cite this