Vojnosanitetski pregled 2014 Volume 71, Issue 12, Pages: 1116-1122
https://doi.org/10.2298/VSP130901058P
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Examination of the bioelectrical activity of the masticatory muscles during Angle’s Class II division 2 therapy with an activator
Petrović Đorđe (Faculty of Medicine, Dental Clinic of Vojvodina, Novi Sad)
Vujkov Sanja (Faculty of Medicine, Dental Clinic of Vojvodina, Novi Sad)
Petronijević Branislava (Faculty of Medicine, Dental Clinic of Vojvodina, Novi Sad)
Šarčev Ivan (Faculty of Medicine, Dental Clinic of Vojvodina, Novi Sad)
Stojanac Igor (Faculty of Medicine, Dental Clinic of Vojvodina, Novi Sad)
Background/Aim. The muscles of the orofacial region have great influence on
the development of dentition and occlusion formation. It is known that
improper function of these muscles is one of the major etiological factors in
malocclusion. A correlation between function disorders of orofacial muscle
and occlusion disorders has been confirmed, as well as a correlation between
the bioelectric activity of the masticatory muscles, recorded by
electromyography, and bite force upon maximal voluntary contraction of these
muscles. The aim of the study was to analyze the bioelectriacal activity of
temporal and masseter muscles. Methods. The sample consisted of 100 subjects
of both sexes, divided into the control group (n = 30) with neutral and
complete dental arches, and the study group (n = 70) of patients with distal
occlusion. Electromyographic measurement of bioelectric potentials in all the
subjects was conducted for the examined muscles in the physiologic rest
position, central mandible occlusion, and during maximal voluntary
contraction of muscles and saliva swallowing, in Angle Class I and II/2
occlusal relation-ships, prior to treatment, after one year of the
orthodontic treatment and after the treatment with an activator. Results.
Comparing the values of thebioelectrical activity in the control and the
study group before the treatment, a decreased muscle activity was established
in all the three positions in the study group. After the first year of
orthodontic treatment the results showed an elevation in the bioelectrical
activity in both muscles. After treatment with an activator, the
bioelectrical activity in both muscles in the study group was higher than
before the treatment, as it is confirmed by a positive highly significant
coefficient of correlation. Conclusion. In all the three measured positions
of the mandible with Angle Class II/2 malocclusion, bioelectrical activity
was lowest at baseline and increased during the first year of treatment, and
at the end of the treatment it partially reduced close to the approximate
values in normal occlusion. Research on electromyographic activity of
masticatory muscles is useful in everyday clinical practice, especially in
present distinctive skeletal discrepancy before, during and after orthodontic
treatment, if on the bases of the results we can evaluate the treatment, but
also determine the start and duration of the retention period and retention
device type.
Keywords: electromyography, masticatory muscles, malocclusion, angle class I, malocclusion, angle class II, activator appliances, treatment outcome