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PATTERN OF OCCURRENCE OF ODONTOGENIC CYSTS AMONG PATIENTS SEEN AT THE UNIVERSITY OF NAIROBI DENTAL HOSPITAL OVER A PERIOD OF FIVE YEARS (2006 - 2010).

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ABSTRACT

Background: An odontogenic cyst is a pathological cavity containing fluid, semi fluid or gaseous material but does not contain pus. It is normally found in the jaw bones and is coincidental with the sites of dental development. There is inadequate information on the pattern of occurrence of odontogenic cysts in the Kenyan population.

Objective: To describe the pattern of occurrence of odontogenic cysts among patients seen at the University of Nairobi Dental Hospital.

Study design: A retrospective descriptive study of odontogenic cysts biopsied and examined at the University of Nairobi Dental Hospital Histopathological Laboratory.

Setting: The study was conducted at the University of Nairobi Dental Hospital histopathology laboratory.

Materials and methods: Histopathological records of patients seen at the University of Nairobi Dental Hospital between 2006 and 2010 were retrieved and examined for the type of lesion, site, age and gender of the patient. Data analysis was done with the aid of a computer and tabulated in tables for the presentation of the different variables in bar graphs and/or pie charts.

Results: A total of 1350 record files for patients diagnosed with oral lesions were retrieved but 2 cases were excluded because the records were incomplete. Odontogenic cysts account for about 9.99% (135) of all lesions with biopsies taken at UNDH. Dentigerous cyst (28.1%) was the commonest commonest type of odontogenic cyst followed by keratocystic odontogenic tumor (20.7%) and mucoceles (17.0%) in that order. The cysts are observed to be distributed in all ages but with peak age of 11-20 years (34.8%), 21-30 (17.8%) and 31-40 (17.8%). They are least frequent in ages above 60 years (2.2%). Odontogenic cysts are commoner in males (63.7%) than in females 36.3%). More odontogenic cysts affect the mandible (43.18%) as compared to the maxilla (39.39%).

Recommendations: There is need to emphasize diagnosis of odontogenic cysts during training given the slightly high relative frequency in our set up.

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