Electromyographic evaluation of masseter and temporal muscles and cephalometric study in children submitted to maxillary expansion with quad-helix appliance / Avaliação eletromiográfica dos músculos masseter e temporal e cefalométrica em norma lateral de crianças submetidas à expansão maxilar com o aparelho quadri-hélice

AUTOR(ES)

Patricia Maria Monteiro

DATA DE PUBLICAÇÃO

2007

RESUMO

The aim of the present study was to analyze the electromyographic activity of masseter and temporal muscles and the skeletal and dental effects of maxillary expansion realized in children with the quad-helix appliance. The sample consisted of twelve children (10 girls and 2 boys), mean age 7 years and 4 months, with unilateral posterior crossbite. Lateral cephalograms were taken before treatment (T1) and after the quad-helix appliance was removed (T2). The electromyographic activity of masseter and temporal muscles was analyzed before treatment (T1) and after the appliance was removed (T2). The muscular activity was electromyographic analyzed during the clinical situation of rest, maximal voluntary dental clench, non-habitual and habitual chewing. The cephalometric and electromyographic measurements were analyzed statiscally using GraphPad Prism and SPSS 10.0 for Windows, respectively. The differences between T1 and T2 data were evaluated using the paired t- test. The results of the cephalometric analyze showed that the maxillary expansion realized in children with the quad-helix appliance didn?t promote vertical and sagittal skeletal significant change. Only the linear measure 1-PP showed a significant raise considering the dental pattern. During the clinical situation of rest, the electromyographic analyze indicated a diminution on the activity of the masseter muscle and a significant increase on the temporal activity. During maximal voluntary clench, the electromyographic activity of masseter muscle presented a slight diminution and the temporal activity stayed the same at the end of the treatment. Every muscle showed a raise on the electromyographic activity during non-habitual chewing, being statistically significant only for right temporal muscle. The electromyographic activity diminished significantly for every muscle evaluated during the clinical situation of habitual chewing after removal of the quad-helix appliance.

ASSUNTO(S)

cephalometric evaluation posterior crossbite quadri-hélice mordida cruzada posterior electromyography eletromiografia quad-helix appliance masticatory muscles músculos mastigatórios cefalometria

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