Masseter and Temporalis Muscle Activity in Patients with Class III Skeletal Relationships
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Abstract
This study aimed to evaluate the masseter and temporalis muscle activity in patients with Class III skeletal relationships, using surface electromyography (SEMG). The study group consisted of 30 subjects with Class III skeletal relationships, aged 18-34 years (mean 22.4 years) and 30 subjects with Class I skeletal relationships aged 18-35 years (mean 22.6 years). All subjects had normal vertical configuration, no temporomandibular disease and no previous orthodontic treatment. The SEMG activity was recorded from the masseter and temporalis muscles while in maximum clenching on cotton rolls and in maximum voluntary contraction (MVC). The values for maximum clenching on cotton rolls were used to standardize and normalize all MVC data. Then, the percentage overlapping coefficient (POC) index and the torque coefficient (TC) index were calculated from the standardized MVC data. The POC and TC indices from both groups were compared using the two-sample t-test. The masseter POC in the patients with Class III skeletal relationships was less than that in those with Class I skeletal relationships with statistical significance (p<0.01). The temporalis POC and TC were not different between groups. This study shows that patients with Class III skeletal relationships have lower symmetry in the masseter muscle function than do patients with Class I skeletal relationships.
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