title: Impact of midface and upper face fracture on bite force, mandibular mobility, and electromyographic activity.
abstract: This study evaluated the bite force, electromyographic activity, and mandibular mobility in patients undergoing surgery for facial fracture treatment that required a coronal approach. Ten men were divided into two groups: group I, coronal approach with pre-auricular extension (n=4, average age 34.5 years); group II, coronal approach (n=6, average age 24.8 years). The maximum bite force was measured using a dynamometer and mandibular mobility using a calliper. The electromyographic activity of the right masseter (RM), left masseter (LM), right temporal (RT), and left temporal (LT) muscles was evaluated using a Myosystem-Br1 apparatus. Patients were evaluated at 1, 2, 3, and 6 months after surgery. Data were analysed using the repeated measures test (SPSS 21.0; P≤0.05). Statistically significant differences were found for electromyographic activity at rest (group II: LM P=0.00), left laterality (group I: RT P=0.02; group II: RT P=0.04), and maximum voluntary contraction (group I: RM P=0.04 and RT P=0.04; group II: RM P=0.05, LM P=0.00, and LT P=0.01 and for maximum molar bite force in the right (group I, P=0.00; group II, P=0.01) and left (group II, P=0.01) molar regions. The subjects regained electromyographic activity, maximum bite force, and mandibular mobility throughout the period evaluated.
authors.affiliation: Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil. Electronic address: guilherme.spagnol.gs@gmail.com.
authors.forename: G
authors.initials: G
authors.lastname: Spagnol
authors.affiliation: Department of Morphology, Physiology and Basic Pathology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: M
authors.initials: M
authors.lastname: Palinkas
authors.affiliation: Department of Morphology, Physiology and Basic Pathology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: S C H
authors.initials: SCH
authors.lastname: Regalo
authors.affiliation: Department of Morphology, Physiology and Basic Pathology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: P B
authors.initials: PB
authors.lastname: de Vasconcelos
authors.affiliation: Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: C E
authors.initials: CE
authors.lastname: Sverzut
authors.affiliation: Department of Oral and Maxillofacial Surgery and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
authors.forename: A E
authors.initials: AE
authors.lastname: Trivellato
mesh_terms: D000328:Adult; D001732:Bite Force; D004576:Electromyography; D005147:Facial Bones / Q000293:injuries* / Q000601:surgery; D006801:Humans; D008297:Male; D008334:Mandible / Q000503:physiopathology*; D008406:Masseter Muscle / Q000503:physiopathology; D008410:Masticatory Muscles; D009068:Movement / Q000502:physiology; D020127:Recovery of Function; D012887:Skull Fractures / Q000503:physiopathology* / Q000601:surgery; D013703:Temporal Muscle / Q000503:physiopathology; D055815:Young Adult
keywords: bite force; electromyography; facial trauma; mandibular mobility; masticatory muscles