奈良県立医科大学附属病院口腔外科開設後7年間におけるエナメル上皮腫についての臨床統計的観察

Abstract

Sixteen cases of ameloblastoma treated in Department of Oral and Maxillofacial Surgery, Nara Medical University Hospital, during the past seven years from October 1981 to October 1988 are analysed. In this clinico-statistical study, the following results were obtained. (1) Age of the patients ranged from 8 to 71 years old. The mean age was 39.6 years. As for sex distribution, 10 of 16 cases occurred in males, and 6 cases were females. The average duration of the tumor after onset was 23.7 months. (2) All cases occurred in the mandible. Six cases occurred in premolars, 8 cases in molars and mandibular ramus and 2 cases were in other regions. (3) In roentgenographic features, 7 cases were unilocular, 8 cases were multilocular and 1 case was not defined. The sizes of the lesions ranged from the size of the tip of a little finger to the size of an infant's head. (4) Two cases were associated with an impacted tooth and the average age of onset of these cases was 13.5 years. This was 32.3 years younger than the other cases which were not associated with an impacted tooth. (5) In histopathological findings, 2 cases were cystic ameloblastoma, 9 cases were follicular type, 3 cases were plexiform type and 2 cases were acanthomatous type. Basal cell type and granular cell type were not found. In follicular type, one case accompanied by prominent bone formation was observed. (6) The operation methods should be determined by the patient's age, sex, tumor size, roentgenographic features and histopathological types. Except for very large ones, extirpation of the tumor or partial resection from intraoral approach were recommended. If the tumors were too large to conserve the inferior border of the mandible or recurrent, resection was necessary.