title: Odontogenic cysts: demographic profile in a Brazilian population over a 38-year period.
abstract: OBJECTIVE
  To determine the distribution of odontogenic cysts diagnosed histologically over a period of 38 years in a Brazilian population according to age, gender and site affected and to compare these data with previously reported studies from other countries.
  
  
  METHODS
  A total of 1019 cases of odontogenic cysts diagnosed between 1970 and 2007 were studied. Clinical features obtained from the patient records and microscope slides were reviewed according to the 1992 World Health Organization classification.
  
  
  RESULTS
  The mean age was 31.0 years, and there was a predominance of females. The most frequent odontogenic cysts were radicular cysts (61.4%), followed by dentigerous cysts (20.1%) and odontogenic keratocysts (6.4%). Radicular cysts were more frequent in females (62.0%), and the maxillary teeth were the site most commonly involved (63.05%). The peak incidence of dentigerous cysts occurred in the second decade of life, with the posterior region of the mandible being the site most affected (46.3%), followed by the anterior region of the maxilla (27.8%). Odontogenic keratocysts showed a peak incidence between the third and fourth decades of life and predominance among females. The posterior region of the mandible was the site most frequently affected (65.6%).
  
  
  CONCLUSIONS
  The present results showed a similar frequency of odontogenic cysts in this Brazilian population and other populations around the world, with inflammatory cysts being identified as the most frequent odontogenic cyst. Radicular cysts, dentigerous cysts, and odontogenic keratocysts are the most common cystic lesions, accounting for 87.9% of all odontogenic cysts.
authors.affiliation: Department of Oral Pathology, Federal University of Rio Grande do Norte -UFRN, Natal, RN, Brazil. leliabsouza@gmail.com
authors.forename: Lélia-Batista
authors.initials: LB
authors.lastname: de Souza
authors.forename: Manuel-Antonio
authors.initials: MA
authors.lastname: Gordón-Núñez
authors.forename: Cassiano-Francisco-Weege
authors.initials: CF
authors.lastname: Nonaka
authors.forename: Marcell-Costa
authors.initials: MC
authors.lastname: de Medeiros
authors.forename: Tabita-Fernandes
authors.initials: TF
authors.lastname: Torres
authors.forename: Gustavo-Barbalho-Guedes
authors.initials: GB
authors.lastname: Emiliano
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001938:Brazil / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008336:Mandibular Diseases / Q000453:epidemiology*; D008439:Maxillary Diseases / Q000453:epidemiology*; D008875:Middle Aged; D009807:Odontogenic Cysts / Q000453:epidemiology*; D013997:Time Factors; D055815:Young Adult