Two hundred and fifty odontogenic tumors retrieved from the file of the Department of Oral and Maxillofacial Surgery in Hiroshima University Hospital (1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005) were reclassified according to the new WHO classification revised in 2005 and the clinicopathological data were analyzed statistically. Histologically, the tumors contained 68 odontomas, 55 keratocystic odontogenic tumors and 48

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... as. These tumors constituted 68.4% of all the cases. The malefemale ratio of all odontogenic tumors was 1:1.14. Seventy-two cases (28.8%) had no symptoms but abnormal X-ray photograph. In the cases of odontoma, many patients complained of eruption delay of teeth. Fifty-four percent of all the tumors occurred in the molar region of the mandible. Most of them were treated surgically and their prognosis was good except for the 17 recurrence cases.