title: Effect of surgical treatment of mandibular fracture: electromyographic analysis, bite force, and mandibular mobility.
abstract: This study aimed to examine individuals undergoing surgery for the treatment of the fractured mandibular angle, using bite force, mandibular mobility, and electromyographic (EMG) analysis in many different clinical conditions, after 2 months postoperatively. Bite force was recorded with a digital dynamometer, model IDDK. The EMG activity (Myosystem-Br1) included the analysis of the masseter and temporal muscles. Mandibular mobility was measured using a digital pachymeter. The subjects were divided into 3 groups: G1, mandibular angle fracture (n = 7); G2, condylar process fracture (n = 5); and G3, control (n = 12). Data were tabulated and submitted to statistical analysis using the repeated-measure test carried out over time and the Student's t-test (P < 0.05), using the Statistical Package for the Social Sciences software, version 19 (SPSS Inc, Chicago, IL). G1 and G2 had an increase in bite force. In G1, there was a regular decrease in the EMG activity in the second postoperative month. G2 presented an irregular pattern in EMG data during the period tested. Regarding the mandibular mobility, both groups obtained amplitude of all mandibular movements with a high percentage, when compared with control. A good functional recovery was achieved by the individuals who had a mandible angle fracture or condylar process fracture, after 2 postoperative months.
authors.affiliation: From the Departments of *Oral, Maxillofacial Surgery and Periodontology, †Restorative Dentistry, and ‡Morphology, Stomatology and Basic Pathology, School of Dentistry of Ribeirão Preto, University of São Paulo, Sao Paulo, Brazil.
authors.forename: André Oliveira
authors.initials: AO
authors.lastname: Pepato
authors.forename: Marcelo
authors.initials: M
authors.lastname: Palinkas
authors.forename: Simone Cecilio Hallak
authors.initials: SC
authors.lastname: Regalo
authors.forename: Eduardo Henrique Pantosso
authors.initials: EH
authors.lastname: de Medeiros
authors.forename: Paulo Batista
authors.initials: PB
authors.lastname: de Vasconcelos
authors.forename: Cássio Edvard
authors.initials: CE
authors.lastname: Sverzut
authors.forename: Selma
authors.initials: S
authors.lastname: Siéssere
authors.forename: Alexandre Elias
authors.initials: AE
authors.lastname: Trivellato
mesh_terms: D000328:Adult; D001732:Bite Force; D004576:Electromyography / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D005593:Fracture Fixation, Internal / Q000295:instrumentation / Q000379:methods; D006801:Humans; D008297:Male; D008334:Mandible / Q000502:physiology*; D008335:Mandibular Condyle / Q000293:injuries / Q000601:surgery; D008337:Mandibular Fractures / Q000601:surgery*; D008406:Masseter Muscle / Q000502:physiology; D009068:Movement; D009119:Muscle Contraction / Q000502:physiology; D016059:Range of Motion, Articular / Q000502:physiology; D013703:Temporal Muscle / Q000502:physiology; D016896:Treatment Outcome; D055815:Young Adult