title: Assessment of interobserver concordance in polysomnography scoring of sleep bruxism.
abstract: BACKGROUND
  Objective evaluation of sleep bruxism (SB) using whole-night polysomnography (PSG) is relevant for diagnostic confirmation. Nevertheless, the PSG electromyogram (EMG) scoring may give rise to controversy, particularly when audiovisual monitoring is not performed. Therefore, the present study assessed the concordance between two independent scorers to visual SB on a PSG performed without audiovisual monitoring.
  
  
  METHODS
  Fifty-six PSG tests were scored from individuals with clinical history and polysomnography criteria of SB. In addition to the protocol of conventional whole-night PSG, electrodes were also placed bilaterally on the masseter and temporal muscles. Visual EMG scoring without audio video monitoring was scored by two independent scorers (Dentist 1 and Dentist 2) according the recommendations formulated in the AASM manual (2007). Kendall Tau correlation was used to assess interobserver concordance relative to variables "total duration of events (seconds), "shortest events", "longest events" and index in each phasic, tonic or mixed event.
  
  
  RESULTS
  The correlation was positive and significant relative to all the investigated variables, being T>0.54.
  
  
  CONCLUSIONS
  It was found a good inter-examiner concordance rate in SB scoring in absence of audio video monitoring.
authors.affiliation: Departmento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, Vila Clementino, CEP 04021-002 Sao Paulo, Brazil.
authors.forename: Otávio
authors.initials: O
authors.lastname: Ferraz
authors.affiliation: Departmento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, Vila Clementino, CEP 04021-002 Sao Paulo, Brazil.
authors.forename: Thais
authors.initials: T
authors.lastname: de Moura Guimarães
authors.affiliation: Departmento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, Vila Clementino, CEP 04021-002 Sao Paulo, Brazil.
authors.forename: Milton
authors.initials: M
authors.lastname: Maluly Filho
authors.affiliation: Departmento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, Vila Clementino, CEP 04021-002 Sao Paulo, Brazil.
authors.forename: Cibele
authors.initials: C
authors.lastname: Dal-Fabbro
authors.affiliation: Departmento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, Vila Clementino, CEP 04021-002 Sao Paulo, Brazil.
authors.forename: Thays
authors.initials: T
authors.lastname: Abraão Crosara Cunha
authors.affiliation: Departmento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, Vila Clementino, CEP 04021-002 Sao Paulo, Brazil.
authors.forename: Ana
authors.initials: A
authors.lastname: Cristina Lotaif
authors.affiliation: Departmento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, Vila Clementino, CEP 04021-002 Sao Paulo, Brazil.
authors.forename: Teresa
authors.initials: T
authors.lastname: Cristina Barros Schütz
authors.affiliation: Departamento de Pneumologia, Faculdade de Medicina da Universidade de São Paulo, Av.Dr. Enéas Carvalho Aguiar, 44, Cerqueira César, São Paulo, SP CEP 05403-000, Brazil.
authors.forename: Rogério
authors.initials: R
authors.lastname: Santos-Silva
authors.affiliation: Departmento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, Vila Clementino, CEP 04021-002 Sao Paulo, Brazil.
authors.forename: Sergio
authors.initials: S
authors.lastname: Tufik
authors.affiliation: Departmento de Psicobiologia, Universidade Federal de São Paulo, Rua Napoleão de Barros, 925, Vila Clementino, CEP 04021-002 Sao Paulo, Brazil.
authors.forename: Lia
authors.initials: L
authors.lastname: Bittencourt
keywords: Electromyography; Interobserver; Polysomnography; Sleep bruxism