Occlusal force, electromyographic activity of masticatory muscles and mandibular flexure of subjects with different facial types

Occlusal force, electromyographic activity of masticatory muscles and mandibular flexure of subjects with different facial types

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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 AND METHODS: Seventy-eight dentate subjects were divided into 3 groups by Ricke...

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Bibliographic Details
Main Authors: William Custodio, Simone Guimarães Farias Gomes, Fernanda Faot, Renata Cunha Matheus Rodrigues Garcia, Altair Antoninha Del Bel Cury
Format: Article
Language:English
Published: University of São Paulo 2011-08-01
Series:Journal of Applied Oral Science
Subjects:
Vertical dimension
Bite force
Electromyography
Masticatory muscles
Mandible
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-77572011000400009
Description
Summary: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 AND METHODS: Seventy-eight dentate subjects were divided into 3 groups by Ricketts's analysis: 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%. 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.
ISSN:1678-7757
1678-7765

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