Abstract
We studied 5231 patients with odontogenic tumor who visited and were treated at the 61 institutions certified as training facilities by the Japan Society for Oral Tumors, which comprise 25 dental university hospitals, 28 medical university hospitals, and 8 general hospitals (1995-2004) . These tumors were reclassified according to the new WHO classification revised in 2005 and the clinicopathological data were analyzed. The patients were 2582 (49.4%) males and 2649 (50.6% ) females (male : female ratio, 1 : 1.03) .
Histologically, the tumors contained 1460 ameloblastomas, 1258 keratocystic odontogenic tumors and 1079 odontomas. These tumors constituted 74% of all the cases.
