title: [Epidemiology of dental caries and periodontal diseases in middle school students in Suzhou City].
abstract: OBJECTIVE
  To assess the prevalence of dental caries and periodontal diseases in middle school students at the ages of 11 to 13 and 15 to 17.
  
  
  METHODS
  Dental caries and periodontal diseases were assessed strictly by "national survey table of dental caries and periodontal diseases for school students".
  
  
  RESULTS
  The study group consisted of 20 581 students. The percentage of dental caries, DMFT and DMFS in students 11 to 13 years of age were 23.6%,0.40 and 0.54, respectively. The corresponding results were 29.76%, 0.64 and 0.87 for students 15 to 17 years of age, respectively. The percentage of gingivitis and dental calculus in students 11 to 13 years were 75.33% and 35.86%, respectively. The corresponding values in students 15 to 17 years of age were 73.1% and 44.91%, respectively. Female students have significantly few gingivitis and dental calculus than male students in both groups.
  
  
  CONCLUSIONS
  Compared with the students at the same ages in other cities, students in Suzhou city have low percentage of dental caries and periodontal diseases.
authors.affiliation: Suzhou Stomatological Hospital. Jiangsu 215005, China.
authors.forename: W X
authors.initials: WX
authors.lastname: Zhang
authors.forename: Y M
authors.initials: YM
authors.lastname: Zhu
authors.forename: G
authors.initials: G
authors.lastname: An
authors.forename: J L
authors.initials: JL
authors.lastname: Zhu
authors.forename: T X
authors.initials: TX
authors.lastname: Xiao
authors.forename: M Y
authors.initials: MY
authors.lastname: Xu
authors.forename: X K
authors.initials: XK
authors.lastname: Liu