title: [The study on the attrition of molars with occlusal hypersensitivity molars in elderly people].
abstract: OBJECTIVE
  To investigate the attrition of molars in old people who suffered from occlusal hypersensitivity.
  
  
  METHODS
  113 maxillary and mandibular molars of old people (47-74 years old) who had dentine hypersensitivity caused by attrition were studied. The Lavelle's criteria were used.
  
  
  RESULTS
  When the attrition reached to the e type, the rate of lesion rose up quickly (19.47%), the highest incidence was seen in g type (41.59%). The hypersensitivity occurred as 48.67% in the first molar, 51.33% in the second molar, 53.10% in enamel-dentin junction, and 38.05% in dentine concave site.
  
  
  CONCLUSIONS
  The rate of hypersensitivity rises with the severity of attrition. There is no significant difference between the first molar and the second molar, but the incidence of hypersensitivity in enamel-dentin junction is significantly higher than in dentine concave site (P < 0.05).
authors.affiliation: Department of Stomatology, People's Hospital, Beijing Medical University, Beijing 100044.
authors.forename: Y
authors.initials: Y
authors.lastname: Cao
authors.forename: C
authors.initials: C
authors.lastname: Gao
authors.forename: Y
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D000368:Aged; D003807:Dentin Sensitivity / Q000453:epidemiology* / Q000209:etiology; D006801:Humans; D008875:Middle Aged; D008963:Molar; D014072:Tooth Abrasion / Q000453:epidemiology*