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J Dent Res 53(3): 661-669, 1974
© 1974 International and American Associations for Dental Research
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Electromyographic Analysis of the Circumoral Muscles of Facial Expression

ROBERT P. LEHR 1, PATRICIA L. BLANTON 1, NORMAN L. BIGGS 1, and DAVID A. SEWELL 1

1 Department of Gross Anatomy, Baylor College of Dentistry, Dallas, Texas 75226, USA

Electromyography of the circumoral muscles was undertaken with the use of fine-wire electrodes that were inserted into hair follicles of ten patients with full dentitions and normal occlusion. The inferior circumoral muscles, which initiated many oral activities, had a higher degree of activity than did the superior circumoral muscles. Tonic discharge during mandibular rest was infrequent.

Submitted on January 8, 1973






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