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- Title
Muscle Response with Rigid Fixed Functional Appliance - An EMG Study of Masseter and Anterior Temporalis Muscles.
- Authors
Sood, S.; Kharbanda, Om P.; Duggal, R.; Sood, M.; Gulati, S.
- Abstract
Objective: To evaluate mechanism of muscle response with rigid fixed functional appliance. Material and method: An electromyographic study was performed on 20 young growing females with Class II Division 1 malocclusion. Group 1 (n=10) served as control group and group 2 (n=10) were treated with rigid fixed functional appliance. Bilateral EMG activity from anterior temporalis and masseter muscles was monitored longitudinally to determine changes in postural, swallowing, and maximal voluntary clenching during an observation period of 6 months. Results: There was a significant decrease in EMG activity during swallowing of saliva (p< . 05) and maximal clenching (p< . 01) & (p< . 001) in group 2, which persisted for up to 1 month, gradually returning toward pre appliance levels near the end of the experimental period. Conclusion: A definite response of anterior temporalis and masseter muscles was observed and there was adequate neuromuscular adaptation following insertion of rigid fixed functional appliance at the end of six months. As the EMG activity in the muscles investigated in the present study is decreased significantly, our data is consistent with the concept which assigns a major role to the viscoelastic elements of muscle and increased lip strength as the source of stimulus for bone remodeling associated with the action of these appliances.
- Subjects
MASSETER muscle; TEMPORALIS muscle; ELECTROMYOGRAPHY; MALOCCLUSION; BRUXISM; DEGLUTITION; NEUROMUSCULAR system; VISCOELASTICITY
- Publication
Virtual Journal of Orthodontics, 2012, Vol 9, Issue 2, p7
- ISSN
1128-6547
- Publication type
Article