title: Occlusal factors are not related to self-reported bruxism.
abstract: OBJECTIVE
  To estimate the contribution of various occlusal features of the natural dentition that may identify self-reported bruxers compared to nonbruxers.
  
  
  METHODS
  Two age- and sex-matched groups of self-reported bruxers (n = 67) and self-reported nonbruxers (n = 75) took part in the study. For each patient, the following occlusal features were clinically assessed: retruded contact position (RCP) to intercuspal contact position (ICP) slide length (< 2 mm was considered normal), vertical overlap (< 0 mm was considered an anterior open bite; > 4 mm, a deep bite), horizontal overlap (> 4 mm was considered a large horizontal overlap), incisor dental midline discrepancy (< 2 mm was considered normal), and the presence of a unilateral posterior crossbite, mediotrusive interferences, and laterotrusive interferences. A multiple logistic regression model was used to identify the significant associations between the assessed occlusal features (independent variables) and self-reported bruxism (dependent variable).
  
  
  RESULTS
  Accuracy values to predict self-reported bruxism were unacceptable for all occlusal variables. The only variable remaining in the final regression model was laterotrusive interferences (P = .030). The percentage of explained variance for bruxism by the final multiple regression model was 4.6%. This model including only one occlusal factor showed low positive (58.1%) and negative predictive values (59.7%), thus showing a poor accuracy to predict the presence of self-reported bruxism (59.2%).
  
  
  CONCLUSIONS
  This investigation suggested that the contribution of occlusion to the differentiation between bruxers and nonbruxers is negligible. This finding supports theories that advocate a much diminished role for peripheral anatomical-structural factors in the pathogenesis of bruxism.
authors: Department of Maxillofacial Surgery, University of Padova, Padova, Italy. daniele.manfredini@tin.it
authors: Daniele
authors: D
authors: Manfredini
authors: Corine M
authors: CM
authors: Visscher
authors: Luca
authors: L
authors: Guarda-Nardini
authors: Frank
authors: F
authors: Lobbezoo
mesh_terms: D000328:Adult; D002012:Bruxism / Q000175:diagnosis / Q000209:etiology*; D016022:Case-Control Studies; D002508:Cephalometry; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008310:Malocclusion / Q000150:complications*; D008954:Models, Biological; D057566:Self Report; D012680:Sensitivity and Specificity; D055815:Young Adult