Clinicostatistical analysis of 109 cases of odontogenic tumors

One hundred nine cases of odontogenic tumor diagnosed from April 1980 to March 1997 at the Department of Dentistry and Oral Surgery, Toyama Medical and Pharmaceutical University were clinically studied on the basis of 1992 WHO classification. The results were as follows 1) Tumors were classified as 51 compound odontomas (46.8%), 35 ameloblastomas (32.1%), 17 complex odontomas (15.6%), 4 benign tumor (3.6%), and 2 malignant tumor (1.8%) . 2) The ratio of males to females was 1 : 0.9. The age at first visit ranged from 6 to 71 years, with a mean age of 26.7 years. Approximately 70% of all cases were under 30 years. 3) Most of the chief complaints were swelling (35.8%) or abnormal eruption of tooth (25.7%) . As for ameloblastoma, approximately 70% of its complain was swelling. 4) There were 43 cases (39.4%) in the maxilla and 66 cases (60.6%) in the mandible. The most frequent sites of ameloblastoma, compound odontoma, and complex odontoma were the mandibular molar region, the anterior tooth region of the maxilla, and the mandibular molar region of the mandible.