Cambios electromiográficos tras corregir la mordida cruzada posterior unilateral

Résumé

The aim of this study was to assess the neurofunctional alterations (EMG) at rest and during clenching that occur after orthodontic correction of unilateral posterior crossbites (UPCB) in 25 Class I patients aged 10 to 15 years. Surface electrodes were used to record electromyographic (EMG) activity of masticatory muscles before and after orthodontic therapy. EMG activity comparisons between the cross-bite and the non-crossbite side were performed before and after treatment. Pretreatment and posttreatment comparisons were performed within each side. At rest position there were no significant pre-posttreatment changes although the differences in the EMG activities between sides decreased. EMG activity of the posterior temporalis was still high after treatment. During posttreatment clenching there was a significant increase in EMG activities of the masseters and anterior temporalis.The increase in the masseter activity equaled its activity to one of the temporalis that had dominated before treatment.