title: Masticatory muscle activity during maximum voluntary clench in different research diagnostic criteria for temporomandibular disorders (RDC/TMD) groups.
abstract: The research diagnostic criteria for temporomandibular disorders (RDC/TMD) are used for the classification of patients with temporomandibular disorders (TMD). Surface electromyography of the right and left masseter and temporalis muscles was performed during maximum teeth clenching in 103 TMD patients subdivided according to the RDC/TMD into 3 non-overlapping groups: (a) 25 myogenous; (b) 61 arthrogenous; and (c) 17 psycogenous patients. Thirty-two control subjects matched for sex and age were also measured. During clenching, standardized total muscle activities (electromyographic potentials over time) significantly differed: 131.7 microV/muVs % in the normal subjects, 117.6 microV/microVs % in the myogenous patients, 105.3 microV/microVs % in the arthrogenous patients, 88.7 microV/microVs % in the psycogenous patients (p<0.001, analysis of covariance). Symmetry in the temporalis muscles was larger in normal subjects (86.3%) and in myogenous patients (84.9%) than in arthrogenous (82.7%), and psycogenous patients (80.5%) (p=0.041). No differences were found for masseter muscle symmetry and torque coefficient (p>0.05). Surface electromyography of the masticatory muscles allowed an objective discrimination among different RDC/TMD subgroups. This evaluation could assist conventional clinical assessments.
authors.affiliation: Functional Anatomy Research Center (FARC), Laboratorio di Anatomia Funzionale dell'Apparato Stomatognatico (LAFAS), Dipartimento di Morfologia Umana, Facoltà di Medicina e Chirurgia, Università Degli Studi, Via Mangiagalli 31, I-20133 Milano, Italy.
authors.forename: Gianluca M
authors.initials: GM
authors.lastname: Tartaglia
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: Moreira Rodrigues da Silva
authors.forename: Stefano
authors.initials: S
authors.lastname: Bottini
authors.forename: Chiarella
authors.initials: C
authors.lastname: Sforza
authors.forename: Virgilio F
authors.initials: VF
authors.lastname: Ferrario
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D001732:Bite Force; D016022:Case-Control Studies; D016009:Chi-Square Distribution; D003937:Diagnosis, Differential; D016002:Discriminant Analysis; D004576:Electromyography / Q000379:methods* / Q000592:standards; D019317:Evidence-Based Medicine; D005260:Female; D006801:Humans; D008297:Male; D008410:Masticatory Muscles / Q000503:physiopathology*; D008875:Middle Aged; D009119:Muscle Contraction / Q000502:physiology*; D015588:Observer Variation; D010147:Pain Measurement; D010808:Physical Examination; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology