title: No association between incisal tooth wear and temporomandibular disorders.
abstract: BACKGROUND
  Incisal tooth wear may be a sign of long-term bruxing behavior. Bruxism is purported to be a risk factor for temporomandibular disorders (TMD).
  
  
  OBJECTIVE
  The purpose of this clinic-based case-control study was to investigate whether the wear of anterior teeth is associated with TMD.
  
  
  METHODS
  Two hundred eight TMD patients and 172 control subjects were selected for participation. After exclusion of subjects with more than 1 missing premolar or molar zone in opposite arches, as well as subjects with missing or severely restored anterior teeth, 154 TMD patients and 120 control subjects were included in the study (age 31.2 +/- 13.4 years; range 13 to 76 years). Anterior tooth wear was assessed on casts with a 0 to 5 scale. A multiple logistic regression analysis, controlling for the effects of age and gender, was performed to investigate the relationship between tooth wear and TMD.
  
  
  RESULTS
  An odds ratio of 0.76 (95% confidence interval: 0.51 to 1.15) indicated that after adjusting for gender and age, the odds in favor of TMD decreased an estimated 24% for each additional unit of the mean tooth wear score. This result was not significant (P=.20).
  
  
  CONCLUSIONS
  Within the limitations of this study, incisal tooth wear (assessed on dental casts) was not significantly associated with TMD when the influence of age and gender was controlled. Based on these findings, a clinically relevant risk for TMD from incisal tooth wear can be excluded. Hence, the presented evidence does not support the idea that treatment of incisal tooth wear is indicated to prevent TMD.
authors.affiliation: Department of Prosthodontics, Martin Luther University Halle-Wittenberg, Halle/Saale, Germany. mtjohn@u.washington.edu
authors.forename: Mike Torsten
authors.initials: MT
authors.lastname: John
authors.forename: Henning
authors.initials: H
authors.lastname: Frank
authors.forename: Frank
authors.initials: F
authors.lastname: Lobbezoo
authors.forename: Mark
authors.initials: M
authors.lastname: Drangsholt
authors.forename: Karl-Ernst
authors.initials: KE
authors.lastname: Dette
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D002012:Bruxism / Q000150:complications; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007180:Incisor / Q000473:pathology*; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D017678:Sex Distribution; D013706:Temporomandibular Joint Dysfunction Syndrome / Q000209:etiology*; D014072:Tooth Abrasion / Q000150:complications*