title: Tooth wear in young subjects: a discriminator between sleep bruxers and controls?
abstract: OBJECTIVE
  This study investigated whether the presence of tooth wear in young adults can help to discriminate patients with sleep bruxism (SB) from control subjects.
  
  
  METHODS
  The tooth wear clinical scores and frequency of sleep masseter electromyographic activity of 130 subjects (26.6 +/- 0.5 years) were compared in this case-control study. Tooth wear scores (collected during clinical examination) for the incisors, canines, and molars were pooled or analyzed separately for statistics. Sleep bruxers (SBrs) were divided into two subgroups according to moderate to high (M-H-SBr; n = 59) and low (L-SBr; n = 48) frequency of masseter muscle contractions. Control subjects (n = 23) had no history of tooth grinding. The sensitivity and specificity of tooth wear versus SB diagnosis, as well as positive and negative predictive values (PPV and NPV), were calculated. One-way analysis of variance and the Mann-Whitey U test were used to compare groups.
  
  
  RESULTS
  Both SBr subgroups showed significantly higher tooth wear scores than the control group for both pooled and separated scores (P < .001). No difference was observed between M-H-SBr and L-SBr frequency groups (P = .14). The pooled sum of tooth wear scores discriminates SBrs from controls (sensitivity = 94%, specificity = 87%). The tooth wear PPV for SB detection was modest (26% to 71%) but the NPV to exclude controls was high (94% to 99%).
  
  
  CONCLUSIONS
  Although the presence of tooth wear discriminates SBrs with a current history of tooth grinding from nonbruxers in young adults, its diagnostic value is modest. Moreover, tooth wear does not help to discriminate the severity of SB. Caution is therefore mandatory for clinicians using tooth wear as an outcome for SB diagnosis.
authors.affiliation: Faculté de Médecine Dentaire, Université de Montral, Canada.
authors.forename: Susumu
authors.initials: S
authors.lastname: Abe
authors.forename: Taihiko
authors.initials: T
authors.lastname: Yamaguchi
authors.forename: Pierre H
authors.initials: PH
authors.lastname: Rompré
authors.forename: Pierre
authors.initials: P
authors.lastname: De Grandmont
authors.forename: Yunn-Jy
authors.initials: YJ
authors.lastname: Chen
authors.forename: Gilles J
authors.initials: GJ
authors.lastname: Lavigne
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D003481:Cuspid / Q000473:pathology; D003743:Dental Enamel / Q000473:pathology; D003804:Dentin / Q000473:pathology; D004576:Electromyography; D005260:Female; D005544:Forecasting; D006801:Humans; D007180:Incisor / Q000473:pathology; D008297:Male; D008406:Masseter Muscle / Q000503:physiopathology; D008963:Molar / Q000473:pathology; D009119:Muscle Contraction / Q000502:physiology; D017286:Polysomnography; D011237:Predictive Value of Tests; D012372:ROC Curve; D012680:Sensitivity and Specificity; D020186:Sleep Bruxism / Q000150:complications* / Q000175:diagnosis / Q000503:physiopathology; D012894:Sleep Stages / Q000502:physiology; D013703:Temporal Muscle / Q000503:physiopathology; D014072:Tooth Abrasion / Q000209:etiology*; D055815:Young Adult