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An electromyographic analysis of some of masticatory muscles and orbicularis oris muscle in skeletal class ¥² malocclusion and normal occlusion

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Abstract

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#ÃÊ·Ï#
This study was performed to investigate the relationship between the EMG activity of
the orofacial muscles and facial skeletal form in skeletal class ¥² malocclusion and
normal occlusion.
The subjects consisted of 23 boys with skeletal class ¥² malocclusion and 30 boys
with normal occlusion aged from 10 to 13 years.
The measurements from cast model, cephalometrics, and EMG recording from the
anterior temporal, masseter and orbicularis orig muscles were analyzed at rest position
during maximal biting in centric occlusion, and during mastication and swallowing of
peanuts.
The following results were obtained ;
1. At rest position the activity of the anterior temporal muscle was the highest of all
the muscles examined both in the boys with normal occlusion and skeletal class ¥²
malocclusion. The orbicularis oris muscle activity of skeletal class ¥² subjects was
higher than that of normal subjects, while the activities of anterior temporal and
masseter muscles were not significantly different between the two groups.
2. During mastication or maximal biting in centric occlusion, the activities of anterior
temporal and masseter muscles in skeletal class ¥² subjects were signicantly lower than
that of normal subjects.
3. During swallowing the orbicularis oris muscle activity of skeletal class ¥² subjects
was higher than that of normal subjects
4. The activities of anterior temporal and masseter muscles during mastication or
maximal biting in centric occlusion were inversely correlated with the mandibular
prognathism and with reversed overjet
5. No significant correlation was noted between the activities of masticatory muscles
and the total number of erupted teeth or occluded ones.

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