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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.  Study design: 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%).  Conclusion: 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

Odontogenic cysts: Demographic profile in a Brazilian population over a 38-year period