Posiocionamento e discrepância dentária da região ânterro-inferior e atividade EMG dos músculos orbicular da boca (porção inferior) e mentual em indivíduos com modo respiratório predominantemente nasal ou bucal

AUTOR(ES)

Eliane Hermes Dutra

DATA DE PUBLICAÇÃO

2004

RESUMO

The objective of this study was to evaluate and to compare, in two moments, the EMG activity of the orbicularis oris, lower fascicle (LOO) and mentalis muscle (MT), in predominantly nasal (PNB) or mouth (PMB) breather subjects. A sample of 34 subjects with Class II, division 1, malocclusion was used, in a ranging age of 11 years to 14 years and 11 months in the observation moment 1, and 13 years and 4 months to 16 years and 6 months in the observation moment 2 and divided according to the breathing mode in 22 subjects PNB and 12 subjects PMB. The EMG activity was recorded by bipolar surface electrodes, at rest and during 12 movements, processed and normalized by the EMG highest value, in two evaluation moments, in a 2 years and 5 months period. For both the groups mean value in these two observation moments and the variables increment comparison, Student t-test and U Mann-Whitney non-parametric test were used. Greater EMG activity of the MT was observed in the PMB group, at rest and swallowing, in the two moments of evaluation. After 2 years and 5 months, an increased EMG activity of the LOO at blowing and at phoneme /b/ was observed as well as a larger increment of the EMG activity of this muscle at blowing, pronunciation of the phoneme /m/ and chewing in the PMB group. Besides that, after a 2 years and 5 months period, a greater EMG activity of the MT at chewing in the PMB group was observed. These results suggest that mouth breathing influences in the EMG activity of the LOO and MT muscles.

ASSUNTO(S)

respiração bucal odontologia ortodontia maloclusão

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