Effect of natural mediotrusive contact on electromyographic activity of jaw and cervical muscles during chewing.
Acta Odontol Scand
; 73(8): 626-32, 2015.
Article
em En
| MEDLINE
| ID: mdl-25891182
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 ANDMETHODS:
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.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Músculo Temporal
/
Eletromiografia
/
Mastigação
/
Músculos do Pescoço
Limite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Acta Odontol Scand
Ano de publicação:
2015
Tipo de documento:
Article
País de afiliação:
Chile