title: Surface electromyography and magnetic resonance imaging of the masticatory muscles in patients with arthrogenous temporomandibular disorders.
abstract: OBJECTIVE
  The purpose of this study was to verify the characteristics of surface electromyography (sEMG) of masticatory muscles in patients with temporomandibular disorders (TMDs) with differing pathology.
  
  
  METHODS
  A total of 24 patients with TMDs were categorized according to the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD); magnetic resonance imaging (MRI) classified the patients as having disk displacement alone (DD) (mean age, 22 years; SD, 5; 3 men, 6 women) or having osteoarthrosis with or without disk displacement (OA) (mean age, 37 years; SD, 10; 4 men, 11 women); sEMG was performed according to a standardized protocol.
  
  
  RESULTS
  The MRI score was significantly correlated to the torque coefficient (r = 0.57) and the temporalis (r = 0.85) and masseter (r = 0.46) muscle standardized symmetry. The discriminating ability of participant age and sEMG scores in separating the 2 groups was assessed by receiver operating characteristic analysis. Each of the sEMG scores showed a significant ability in discriminating between osteoarthrosis and disk displacement.
  
  
  CONCLUSIONS
  The recording of the masticatory muscle function through sEMG can be a first diagnostic approach to patients with TMDs, reserving MRI assessment to selected cases.
authors.affiliation: Department of Biomedical Sciences for Health, Functional Anatomy Research Center (FARC), Laboratory of Functional Anatomy of the Stomatognathic System (LAFAS), Faculty of Medicine and Surgery, Università degli Studi di Milano, Milan, Italy; Department of Medical and Surgical Specialties, Radiologic Sciences, and Public Health, Dental Clinic, Università degli Studi di Brescia, Brescia, Italy.
authors.forename: Gianluigi
authors.initials: G
authors.lastname: Lodetti
authors.affiliation: Department of Clinical Sciences and Community Health, Institute of Medical Statistics and Biometry "G.A. Maccacaro," University of Milan, Milan, Italy.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Marano
authors.affiliation: Department of Medical and Surgical Specialties, Radiologic Sciences, and Public Health, Dental Clinic, Università degli Studi di Brescia, Brescia, Italy.
authors.forename: Paola
authors.initials: P
authors.lastname: Fontana
authors.affiliation: Department of Biomedical Sciences for Health, Functional Anatomy Research Center (FARC), Laboratory of Functional Anatomy of the Stomatognathic System (LAFAS), Faculty of Medicine and Surgery, Università degli Studi di Milano, Milan, Italy.
authors.forename: Gianluca M
authors.initials: GM
authors.lastname: Tartaglia
authors.affiliation: Department of Ophthalmology, Otolaryngology, and Head and Neck Surgery, Faculty of Medicine, University of São Paulo, Ribeirão Preto, São Paulo, Brazil.
authors.forename: Claudia
authors.initials: C
authors.lastname: Maria de Felício
authors.affiliation: Department of Clinical Sciences and Community Health, Institute of Medical Statistics and Biometry "G.A. Maccacaro," University of Milan, Milan, Italy; Unit of Medical Statistics and Biometry, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy.
authors.forename: Elia
authors.initials: E
authors.lastname: Biganzoli
authors.affiliation: Department of Biomedical Sciences for Health, Functional Anatomy Research Center (FARC), Laboratory of Functional Anatomy of the Stomatognathic System (LAFAS), Faculty of Medicine and Surgery, Università degli Studi di Milano, Milan, Italy. Electronic address: chiarella.sforza@unimi.it.
authors.forename: Chiarella
authors.initials: C
authors.lastname: Sforza
mesh_terms: D000293:Adolescent; D000328:Adult; D004576:Electromyography / Q000379:methods*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008410:Masticatory Muscles / Q000503:physiopathology*; D008875:Middle Aged; D013705:Temporomandibular Joint Disorders / Q000503:physiopathology*