title: A clinicopathological study of odontogenic cysts and tumors in hamadan, iran.
abstract: BACKGROUND
  Odontogenic cysts and tumors are the most frequent osseous destructive lesions of the jaws; however, there is little information regarding the relative frequency of these lesions among the Iranian population.
  
  
  OBJECTIVE
  The purpose of this study was to determine the distribution of clinically and histologically- diagnosed odontogenic cysts and tumors during a period of 13 years in Hamadan, and also its correlation with age, gender, and the site of the lesion.
  
  
  METHODS
  A descriptive cross-sectional study was performed on 413 oral and maxillofacial specimens during 1996 to 2008.The age and the gender of patients, as well as the site of lesion were recorded. The data were analyzed using SPSS software.
  
  
  RESULTS
  Totally, 70 specimens were recorded as odontogenic cysts and 11 specimens were diagnosed as odontogenic tumors. The most frequent odontogenic cysts were dentigerous cysts (27.2%), followed by radicular cysts (18.6%) and odontogenic keratocysts (18.6%). In addition, cysts were more frequent in male than female individuals. Ameloblastoma was the most frequent odontogenic tumor (64%).
  
  
  CONCLUSIONS
  Odontogenic cysts were in correlation with age, gender and location. These results showed that dentigerous cyst and odontogenic keratocyst were more frequent than other studies. More investigations should be performed to determine the frequency of odontogenic tumors in Iran.
authors.affiliation: Dept. of Oral and Maxillofacial Pathology, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran.
authors.forename: Fahimeh
authors.initials: F
authors.lastname: Baghaei
authors.affiliation: Dental Research Center, Dept. of Oral and Maxillofacial Pathology, School of Dentistry, Hamadan University of Medical Sciences Hamadan, Iran.
authors.forename: Massoumeh
authors.initials: M
authors.lastname: Zargaran
authors.affiliation: Dentist, Arak, Iran.
authors.forename: Hamidreza
authors.initials: H
authors.lastname: Najmi
authors.affiliation: Dept. of Biostatistics and Epidemiology, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran.
authors.forename: Abbas
authors.initials: A
authors.lastname: Moghimbeigi
keywords: Odontogenic cyst; Odontogenic tumor; Oral lesions; Prevalence