title: [Logistic regression analysis of wedge-shaped defects in the middle-aged and elderly].
abstract: OBJECTIVE
  To investigate and identify the possible clinical risk factors associated with the formation of wedge-shaped defects.
  
  
  METHODS
  Four hundred and ninety-three subjects were examined. The possible risk factors associated with wedge-shaped defects were identified by logistic regression analysis.
  
  
  RESULTS
  The prevalence of wedge-shaped defects was observed 90.5% in this population. The prevalence and severity of wedge-shaped defects were found to be increasing with age. The correlation between age, sex, preferred side for tooth chewing, brushing twice a day, malocclusion, the formation and severity of wedge-shaped defects were noted.
  
  
  CONCLUSIONS
  Occlusal factors and tooth brushing have found related to the formation of wedge-shaped defects.
authors.affiliation: School of Stomatology, Peking University, Beijing 100081, China.
authors.forename: Q
authors.initials: Q
authors.lastname: Zhang
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: P
authors.initials: P
authors.lastname: Li
authors.forename: J
authors.initials: J
authors.lastname: Li
mesh_terms: D000367:Age Factors; D000368:Aged; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D016015:Logistic Models; D008297:Male; D008310:Malocclusion / Q000150:complications; D008875:Middle Aged; D015995:Prevalence; D012307:Risk Factors; D014072:Tooth Abrasion / Q000453:epidemiology* / Q000209:etiology*; D014099:Toothbrushing / Q000009:adverse effects