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The authors analyzed retrospectively the 60 patients with ameloblastoma who were treated at Department of Oral and Maxillofacial Surgery, Pusan National University Hospital from March, 1990 to December, 1995. The results obtained were as follows: There were 26 males (43.3%) and 34 females (56.7%). The peak age of patients was the third decade (41.7%). The majority of cases occurred in the mandible 93.3%, especially in the angle region (91.1%). Eighteen of 60 patients (30.0%) were associated with an impacted tooth, by impacted 3rd molar teeth (16.6%), molar (10.0%), and premolar and canine (3.4%) in order. Fifteen of 60 patients (25%) were associated with an odontogenic cyst, by dentigenous cyst(13.3%), odontogenic keratocyst(8.4%), and radicular cyst(3.3%) in order. Radiographically, there were 32 unilocular types(54.2%) with average age of 24.9 10.8 years, 14 multilocular types(23.7%) with average age of 35.7 17.7 and 13 mixed types(22.0 %) with average age of 41.4 15.8. Histopathologically, there were 42 follicular types(70.0%) with average age of 33.7 15.1 years and 18 plexiform types(30.0%) with average age of 26 14.6. Conservertive treatment was performed in the 33 patients(55.0%) and their average age was 25.2 13.9 years and radical treatment in the 27 patients(45.0%) and their average age was 39.3 41.8. Overall recurrence rate was 10%. A consistent correlation between the age of the patient and the radiographic or histologic type of mandibular ameloblastoma was observed. There was a tendency for ameloblastomas of the follicular type to show a multilocular or mixed appearance and for those of the plexiform type to show a unilocular appearance.