title: [Investigation on the positions and relevant factors of wedge-shaped defects in the elderly].
abstract: OBJECTIVE
  To investigate the position and relevant factors of wedge-shaped defects in elderly.
  
  
  METHODS
  462 elderly were examined.
  
  
  RESULTS
  The occurrence rate of wedge-shaped defects was 99.1%, all had at least labial or buccal defects, with premolars the most frequent. However, 15.2% of them had lingual defects, most frequently in molars. No significant association were found between wedge-shaped defect position and tooth brushing or erosion factors in the group. In tooth with defect, the occlusal surface wear was more severe, the denture abutment teeth were more in number, and the functional mobility was increased; in teeth with lingual defect, these phenomena were more obvious.
  
  
  CONCLUSIONS
  The wedgeshaped defects, besides tooth brushing and erosion factors, occlusal force and its accumulation plays a role as well, lingual lesions are more related to traumatic occlusal force.
authors.affiliation: School of Stomatology, Beijing Medical University, Beijing 100081.
authors.forename: Q
authors.initials: Q
authors.lastname: Zhang
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: C
authors.initials: C
authors.lastname: Wang
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003769:Dental Occlusion, Traumatic / Q000150:complications; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014072:Tooth Abrasion / Q000209:etiology*; D014077:Tooth Erosion / Q000209:etiology; D014099:Toothbrushing