Abstract
Background and aims. The aim of this study was to investigate the relative frequency of developmental odontogenic
cysts in an Iranian population.
Materials and methods. In this study 245 cysts from both jaws, treated in the Faculty of Dentistry at Tabriz University of
Medical Sciences during a 10-year period from 1998 to 2008, were analyzed in order to evaluate the incidence of such cysts.
We had permission from all the patients. Case histories of 65% of male and 35% of female patients were analyzed. The age of
the patients varied from 14 to 64 years, with an average of 33.21 ± 10.89.
Results. In this 10-year study of odontogenic cysts, 97 cases were developmental odontogenic cysts with the following incidence:
dentigerous cyst, 44%; odontogenic keratocyst, 36%; primordial cyst, 9%; Gorlin cyst, 2%; lateral periodontal cyst, 3%;
eruption cyst, 3%; and gingival cyst, 3% (adults 2%, infants 1%).
A total of 60% of the cysts were found in the mandible and 40% in the maxilla. Regarding the mandible, the molar region was
involved in 47% of the cases, premolar region in 33% and anterior region in 20% (total = 100%). Regarding the maxilla, the
canine-to-canine region was involved in 52% of the cases, premolar region in 20% and molar region in 28% (total = 100%).
Conclusion. An important finding in this study was the fact that 39% of the jaw cysts were developmental odontogenic
cysts and the most common developmental odontogenic cysts were dentigerous cyst and OKC (odontogenic keratocyst).