This survey was based on the analysis of biopsy specimens that were diagnosed histopathologically in Department of Oral Pathology, Kyushu Dental College, from 1991 to 1995. This report presents the types and frequency of 1, 603 cases of oral lesions. The results are as follows : The ratio of male to female was 1.01 to 1. The cystic lesions revealed the largest group in this series and composed 670 cases (41.8%) of all 1, 603 cases, followed by tumors 386 cases (24.1%), oral mucosal lesions 216 cases (13.5%) and others. Listed in order of frequency, the most common disease was radicular cyst 241 cases (15.03%), mucous cyst 145 cases (9.04%), squamous cell carcinoma 106 cases (6.61%), and dentigerous cyst 97 cases (6.05%) of all 1, 603 cases. Compared with many other reports, these results indicated that no significant differences in the order of a higher frequency of Oral lesions on all cases.
