Occlusal force, electromyographic activity of masticatory muscles and mandibular flexure of subjects with different facial types
J. appl. oral sci
;
19(4): 343-349, July-Aug. 2011. tab
Article
in English
| LILACS
| ID: lil-599759
ABSTRACT
OBJECTIVE:
The aim of this study was to evaluate whether vertical facial patterns influence maximal occlusal force (MOF), masticatory muscle electromyographic (EMG) activity, and medial mandibular flexure (MMF). MATERIAL ANDMETHODS:
Seventy-eight dentate subjects were divided into 3 groups by Ricketts'sanalysis:
brachyfacial, mesofacial and dolychofacial. Maximum occlusal force in the molar region was bilaterally measured with a force transducer. The electromyographic activities of the masseter and anterior temporal muscles were recorded during maximal voluntary clenching. Medial mandibular flexure was calculated by subtracting the intermolar distance of maximum opening or protrusion from the distance in the rest position. The data were analyzed using ANOVA followed by Tukey's HSD test. The significance level was set at 5 percent.RESULTS:
Data on maximum occlusal force showed that shorter faces had higher occlusal forces (P<0.0001). Brachyfacial subjects presented higher levels of masseter electromyographic activity and medial mandibular flexure, followed by the mesofacial and dolychofacial groups. Additionally, dolychofacial subjects showed significantly lower electromyographic temporalis activities (P<0.05).CONCLUSION:
Within the limitations of the study, it may be concluded that maximum occlusal force, masticatory muscle activity and medial mandibular flexure were influenced by the vertical facial pattern.
Full text:
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Index:
LILACS (Americas)
Main subject:
Bite Force
/
Face
/
Mandible
/
Masticatory Muscles
Limits:
Adult
/
Female
/
Humans
/
Male
Language:
English
Journal:
J. appl. oral sci
Journal subject:
Dentistry
Year:
2011
Type:
Article
/
Project document
Affiliation country:
Brazil
Institution/Affiliation country:
Federal University of Pelotas/BR
/
State University of Campinas/BR
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