title: I. Prevalence of crown fractures of permanent incisors in schoolchildren aged 7-11 years from Plovdiv.
abstract: The aim of the study was to determine the prevalence of crown fractures of permanent incisors in schoolchildren aged 7-11 years from the town of Plovdiv.
  
  
  METHODS
  The present study included 2572 children (1287 boys and 1285 girls) at the age of 7 to 11 years from Plovdiv. A modification of the WHO classification for reporting crown fractures was used. Examinations were performed only of the upper and lower incisors, in the classrooms at daylight. Treatments of the fractured teeth after the trauma were also registered. The results were analysed statistically by calculating the chi-square to determine if there was any significant difference between the variables.
  
  
  RESULTS
  The prevalence of crown fractures of permanent teeth in children aged 7-11 years from Plovdiv was 8.67 +/- 0.55%. The crown fracture prevalence in boys was significantly higher than that in the girls for all examined children. Most of the children had only one fractured tooth (82.96 +/- 2.52%). The prevalence of the incisor crown fractures by teeth was 1.28 +/- 0.08%. The greatest number of fractured teeth were located in the maxilla (88.20 +/- 1.99%). Most often the fractures involved only the enamel or the enamel and dentine while complicated crown fractures with pulpal exposure were found in 5.32 +/- 1.38%. Most of the fractured teeth were left untreated (84.79 +/- 2.40%).
  
  
  CONCLUSIONS
  The prevalence of permanent incisor crown fractures in children aged 7-11 years from Plovdiv was 8.67 +/- 0.55%; and by teeth--1.28 +/- 0.08%. Children with only one fractured tooth were the greatest part of all injured children in the study. There were significantly more maxillary teeth fractures, with predominance of uncomplicated crown fractures in the permanent teeth. Treated fractured teeth were very few. Treatment was needed for 78.92 +/- 2.73% of all registered fractured incisors.
authors.affiliation: Department of Pediatric Dentistry, Faculty of Dentistry, Medical University, Plovdiv, Bulgaria.
authors.forename: Ani B
authors.initials: AB
authors.lastname: Belcheva
authors.forename: Kalina N
authors.initials: KN
authors.lastname: Indzhova
authors.forename: Maria St
authors.initials: MS
authors.lastname: Manolova
authors.forename: Rumen St
authors.initials: RS
authors.lastname: Stefanov
authors.forename: Stanimira P
authors.initials: SP
authors.lastname: Mileva
mesh_terms: D002031:Bulgaria / Q000453:epidemiology; D002648:Child; D003188:Composite Resins / Q000627:therapeutic use; D003442:Crowns; D003743:Dental Enamel / Q000293:injuries; D005260:Female; D006801:Humans; D007180:Incisor / Q000293:injuries*; D008297:Male; D015995:Prevalence; D019228:Tooth Crown / Q000293:injuries*; D014082:Tooth Fractures / Q000453:epidemiology* / Q000628:therapy
chemical_list: D003188:Composite Resins