Abstract
The authors experienced a case of speaking difficulty caused by the large growth of dermoid cyst which has been believed to be a rare disease as the cysted tumor in oral cavity.
Speaking examination before and after the extirpation, the examination of the teeth's state, chemical and histological observation of its content were carefully done with the bibliographical studies.
The histological views of the cyst wall were of pavement epithelium and in between, sebaceous glands existed. The hair or sweat gland couldn't be observed. The chemical obsrvation of the cyst content proved mainly the protein and no other particular substance was found. From those findings, it was thought this case was corresponding to Submentosublingual epidermoid cyst.
