title: The immediate effect of changing mandibular position on the EMG activity of the masseter, temporalis, sternocleidomastoid, and trapezius muscles.
abstract: This study investigated the immediate effect of changing mandibular position on the electromyographic (EMG) activity of the masseter (MS), temporalis (TM), sternocleidomastoid (SCM) and trapezius (TR) muscles. Thirty-three (33) asymptomatic subjects (16 males and 17 females), ages 23 to 52 were selected. Surface EMG recordings were obtained for all muscles bilaterally with the mandible in a relaxed open position (relaxed) and during maximal voluntary clenching (fullbite) for the following: a non-repositioning appliance (NONREPOS) and repositioning appliance (REPOS). REPOS significantly reduced EMG activity of all muscles bilaterally during fullbite. During relaxation, reduction in EMG activity was only found for TR bilaterally. NONREPOS decreased the EMG activity bilaterally for TM and TR and unilaterally (left) for MS and SCM during fullbite. During relaxation, NONREPOS decreased muscle activity bilaterally for TR and SCM. A unilateral reduction was found for TM (right). These findings suggest that immediate alterations in mandibular position affect the cranio-cervical system. Both mandibular positions tested lowered the EMG activity of masticatory and cervical muscles in the relaxed and fullbite positions. The trapezius muscle was the most responsive to alterations in mandibular position.
authors.affiliation: The Craniofacial Pain Center, Tufts University School of Dental Medicine, Box 1, One Kneeland St., 6th Floor, Boston, MA 02111, USA. caroline.ceneviz@tufts.edu
authors.forename: Caroline
authors.initials: C
authors.lastname: Ceneviz
authors.forename: Noshir R
authors.initials: NR
authors.lastname: Mehta
authors.forename: Albert
authors.initials: A
authors.lastname: Forgione
authors.forename: M J
authors.initials: MJ
authors.lastname: Sands
authors.forename: Emad F
authors.initials: EF
authors.lastname: Abdallah
authors.forename: Silvia
authors.initials: S
authors.lastname: Lobo Lobo
authors.forename: Sofia
authors.initials: S
authors.lastname: Mavroudi
mesh_terms: D000328:Adult; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D008406:Masseter Muscle / Q000502:physiology; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000502:physiology*; D009334:Neck Muscles / Q000502:physiology; D009967:Orthodontic Appliances; D013703:Temporal Muscle / Q000502:physiology; D014716:Vertical Dimension