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Changes in electromyographic activity following superior repositioning of the maxilla. 1984

C P Johnston, and G S Throckmorton, and W H Bell

Surgical reduction of lower anterior facial height may alter several aspects of jaw muscle function. This study examined the biomechanics, electromyographic activity, and maximal bite forces in three patients manifesting vertical maxillary excess prior to and six months following superior repositioning of the maxilla. Reduction of lower anterior facial height by Le Fort I osteotomy tends to increase mechanical advantage of the jaw adductor muscles. It may also decrease muscle activity during isometric biting. It does not appear to alter the maximal isometric bite force.

UI MeSH Term Description Entries
D008297 Male Males
D008410 Masticatory Muscles Muscles arising in the zygomatic arch that close the jaw. Their nerve supply is masseteric from the mandibular division of the trigeminal nerve. (From Stedman, 25th ed) Masticatory Muscle,Muscle, Masticatory,Muscles, Masticatory
D008437 Maxilla One of a pair of irregularly shaped bones that form the upper jaw. A maxillary bone provides tooth sockets for the superior teeth, forms part of the ORBIT, and contains the MAXILLARY SINUS. Maxillae,Maxillary Bone,Bone, Maxillary,Bones, Maxillary,Maxillary Bones,Maxillas
D008875 Middle Aged An adult aged 45 - 64 years. Middle Age
D010027 Osteotomy The surgical cutting of a bone. (Dorland, 28th ed) Osteotomies
D001732 Bite Force The force applied by the masticatory muscles in dental occlusion. Masticatory Force,Occlusal Force,Bite Forces,Force, Bite,Force, Masticatory,Force, Occlusal,Forces, Bite,Forces, Masticatory,Forces, Occlusal,Masticatory Forces,Occlusal Forces
D002508 Cephalometry The measurement of the dimensions of the HEAD. Craniometry
D003766 Dental Occlusion The relationship of all the components of the masticatory system in normal function. It has special reference to the position and contact of the maxillary and mandibular teeth for the highest efficiency during the excursive movements of the jaw that are essential for mastication. (From Jablonski, Dictionary of Dentistry, 1992, p556, p472) Canine Guidance,Occlusal Guidance,Occlusal Plane,Occlusion, Dental,Dental Occlusions,Guidance, Canine,Guidance, Occlusal,Occlusal Guidances,Occlusal Planes,Occlusions, Dental,Plane, Occlusal,Planes, Occlusal
D004576 Electromyography Recording of the changes in electric potential of muscle by means of surface or needle electrodes. Electromyogram,Surface Electromyography,Electromyograms,Electromyographies,Electromyographies, Surface,Electromyography, Surface,Surface Electromyographies
D005260 Female Females

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