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- Title
Electromyographic evaluation of masticatory, neck, and trunk muscle activity in patients with posterior crossbites.
- Authors
Tecco, Simona; Tetè, Stefano; Festa, Felice
- Abstract
This study investigated the pattern of masticatory, neck, and trunk muscle activity in patients with posterior crossbites and associated mandibular displacement. The test group consisted of 75 patients [45 males mean age 19.5 years, SD 5.6 years, and 30 females mean age 20.4 (SD 3.2) years]. Of this group, 25 patients presented a left posterior crossbite, 25 a right posterior crossbite, and the remaining 25 patients a bilateral posterior crossbite. A control group of 25 subjects (19 males and 6 females aged 22.5 ± 5.8 years) without any crossbite were included. Surface electromyographic (sEMG) activity was recorded bilaterally, in the mandibular rest position and during maximum voluntary clenching (MVC), at the following sites: anterior and posterior temporal, masseter, sternocleidomastoid (SCM), upper and lower trapezius, and cervical muscles.In the mandibular rest position, patients with unilateral crossbites showed a significant difference (P < 0.05) in sEMG activity of the anterior temporal muscle, with the greatest activity being detected on the side to which the mandible displaced. Control subjects demonstrated significantly lower (P < 0.05) sEMG activity but only in the SCM muscle when compared with patients with bilateral posterior crossbites; no such differences were detected in relation to unilateral crossbites. During MVC, control subjects showed significantly lower (P < 0.01) sEMG activity in both the SCM and the posterior cervical muscles compared with patients demonstrating both unilateral and bilateral crossbites.The findings of the present study indicate that the presence of a crossbite can affect electromyography activity of masticatory, neck, and trunk muscles.
- Subjects
MASTICATORY muscles; NECK; TORSO; ELECTROMYOGRAPHY; MUSCLES
- Publication
European Journal of Orthodontics, 2010, Vol 32, Issue 6, p747
- ISSN
0141-5387
- Publication type
Article
- DOI
10.1093/ejo/cjq024