title: Diagnostic validity of the use of a portable single-channel electromyography device for sleep bruxism.
abstract: OBJECTIVE
  The aim of this study was to determine an appropriate cutoff value and the number of nights of sleep with the portable single-channel EMG device (GrindCare) necessary for a valid sleep bruxism (SB) diagnosis.
  
  
  METHODS
  Twenty consecutive post-graduate students and staff at Bauru School of Dentistry composed the sample. Each participant underwent the GrindCare for five consecutive nights and the polysomnography (PSG). The discrimination between bruxers and non-bruxers was based only on the PSG analysis. Data about electromyography per hour with GrindCare (EMG/h) and PSG (bursts/h) were scored.
  
  
  RESULTS
  There were positive correlations between the two devices for EMG/h and bursts/h in three and five consecutive nights. Bland-Altman analysis of the EMG bursts/h showed positive agreement between the methods. The receiver operating characteristic (ROC) analyses also showed that using a minimum of 18 EMG/h for three nights and 19 EMG/h for five nights in GrindCare as cutoffs resulted in a 90 % specificity and positive likelihood ratio equal to 5.
  
  
  CONCLUSIONS
  GrindCare is able to discriminate SB diagnosed by PSG and gold standard criteria, when used for three or five consecutive nights, and it may be a valid choice in clinical practice for SB assessment.
authors.affiliation: Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Al. Octávio Pinheiro Brisola, 9-75, Bauru, SP, Brazil, 17012-901. juliana.dentista@gmail.com.
authors.forename: Juliana
authors.identifier: http://orcid.org/0000-0002-7805-5672
authors.initials: J
authors.lastname: Stuginski-Barbosa
authors.affiliation: Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Al. Octávio Pinheiro Brisola, 9-75, Bauru, SP, Brazil, 17012-901.
authors.forename: André Luís
authors.initials: AL
authors.lastname: Porporatti
authors.affiliation: Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Al. Octávio Pinheiro Brisola, 9-75, Bauru, SP, Brazil, 17012-901.
authors.forename: Yuri Martins
authors.initials: YM
authors.lastname: Costa
authors.affiliation: Dr. Odont, Section of Clinical Oral Physiology, School of Dentistry, Aarhus University, Aarhus, Denmark.|Department of Dental Medicine, Karolinska Institute, Huddinge, Sweden.|Scandinavian Center for Orofacial Neurosciences (SCON), Stockholm, Sweden.
authors.forename: Peter
authors.initials: P
authors.lastname: Svensson
authors.affiliation: Department of Prosthodontics, Bauru School of Dentistry, University of São Paulo, Al. Octávio Pinheiro Brisola, 9-75, Bauru, SP, Brazil, 17012-901.
authors.forename: Paulo César Rodrigues
authors.initials: PC
authors.lastname: Conti
mesh_terms: D000328:Adult; D004576:Electromyography / Q000295:instrumentation*; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D000067716:Point-of-Care Testing; D017286:Polysomnography / Q000295:instrumentation*; D011237:Predictive Value of Tests; D020186:Sleep Bruxism / Q000175:diagnosis*; D011795:Surveys and Questionnaires; D055815:Young Adult
keywords: Diagnosis; Polysomnography; Sleep bruxism; Sleep disorders