Pathological examinations undertaken at our Department in 1991 were statistically reviewed. The number of biopsy materials amounted to a total of 474 from 349 cases (179 males and 170 females). In histological classifications of biopsy materials there were 17 odontogenic tumors. The non-odontogenic benign tumors consisted of 7 papillomas, 18 fibromas, 3hemangiomas, 11ymph angioma, 2 lipomas, 1 myxoma, 1 verrucous xanthoma, 6 pleomorphic adenomas and others. Also found were 36 cases of non-odontogenic malignancy which consisted of 27 squamous cell carcinomas, 3 melanomas, 3 verrucous carcinomas, 2 mucoepidermoid carcinomas and 1 other. The odontogenic cyst consisted of 26 radicular cysts, 6 primordial cysts, and 10 dentigerous cysts. The non-odontogenic cyst consisted of 4 incisive canal cysts, 32 postoperative maxillary cysts, and 28 mucoceles and others. In addition, 10 cases of hyperkeratosis (leukoplakia) and 95 cases of inflammatory lesions were found.