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Quintessence Publishing: Journals: ORTHODONTICS
The Art and Practice of Dentofacial Enhancement

Formerly World Journal of Orthodontics

Edited by
Rafi Romano, DMD, MSc (Editor-in-Chief)

ISSN 2160-2999 (print) / ISSN 2160-3006 (online)

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Summer 2010
Volume 11 , Issue 2

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The Effects of Myofunctional Appliance Treatment on the Perioral and Masticatory Muscles in Class II, Division 1 Patients

Ahmet Yagci, DDS/ Tancan Uysal, DDS, PhD/ Sadik Kara, PhD/Sukru Okkesim, PhD

Pages: 117–122
PMID: 20552097

Aim: To evaluate the effect of a myofunctional appliance—the preorthodontic trainer (POT)—on the perioral and masticatory muscles by electromyography (EMG) in individuals with an Angle Class II, Division 1 malocclusion. Methods: Twenty children were treated with a POT appliance, which had to be worn every day for 1 hour and overnight. The EMG recordings were made at the beginning and end of POT therapy during maximal clenching, swallowing, and sucking. For statistical evaluation, the Wilcoxon nonparametric test was used at the P < .05 level. Results: During POT treatment, the EMG value for clenching of the anterior temporal muscle decreased significantly (P < .001). Also, for the mentalis muscle, the EMG value during clenching decreased significantly; for the orbicularis oris muscle, this was true for sucking (P < .05) and clenching (P < .01). For the masseter muscle, all EMG values were decreased during treatment but significantly only for clenching. Conclusion: During the 6 months of POT treatment, the perioral and masticatory muscles of Class II, Division 1 patients improved significantly. World J Orthod 2010;11:117–122.

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