title: Diagnostic Factors of Odontogenic Cysts in Iranian Population: A Retrospective Study Over the Past Two Decades.
abstract: BACKGROUND
  Early diagnosis of odontogenic cysts due to their silent progression is always a challenging problem for clinicians.
  
  
  OBJECTIVE
  The current study aimed to evaluate the frequency of odontogenic cysts and related factors in a selected Iranian population.
  
  
  METHODS
  The current cross-sectional study was conducted on 312 patients' recorded data in Taleghani Hospital, Tehran, Iran, from April 1993 to December 2013. All related data were extracted from the records and categorized in tables. The correlation between the variables was analyzed by either chi-square or multinominal logistic regression tests. The P values < 0.05 were considered significant.
  
  
  RESULTS
  Evaluation of 312 patients' records (185 males and 127 females) with the mean age of 27.6 showed that Odontogenic Keratocyst (OKC) was the most common odontogenic cyst of all followed by the dentigerous cyst as the second most common lesion. Most of the patients were in the second or third decades of their lives, although there was no statistically significant age distribution. The finding of the current study showed that calcifying odontogenic cyst (COC) occurrence was significantly related to the history of trauma. Enucleation and curettage of the odontogenic cysts were the most common treatment plans of all.
  
  
  CONCLUSIONS
  The current study showed that clinicians should consider the many factors associated with the occurrence of odontogenic cysts.
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran.
authors.forename: Hassan
authors.initials: H
authors.lastname: Mohajerani
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Esmaeelinejad
authors.affiliation: Department of Clinical Epidemiology, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran,IR Iran.
authors.forename: Siamak
authors.initials: S
authors.lastname: Sabour
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran.
authors.forename: Farzad
authors.initials: F
authors.lastname: Aghdashi
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran.
authors.forename: Nima
authors.initials: N
authors.lastname: Dehghani
keywords: Epidemiology; Etiology; Odontogenic Cyst; Odontogenic Keratocyst