Abstract
A maxillar right central incisor with an accessory root at labio-mesial side was found in a mass of teeth accumulated in our laboratory. Survey of literatures reveals that not rarely tendencies of root branching in mandibular incisors and accessory root in maxillar lateral incisors appearing at the point corresponding to cervicomarginal ridge on the lingual side of the root have been so far observed. However this instance of root branching or accessory root in the maxillar central incisor is rarely heard in the literatures, and it is most interesting to see that here the accessory root has developed on the labial side of the incisor. The tooth was generally normal in shape except that the accessory root was seen as a small protuberance. In the mesial side of the tooth a groove started from directly under the top of the mesial gingival line and proceeded aslant toward labial side of the tooth increasing the depth between main and accessory parts of the root and finally ending with complete branching of both. In the distal side of the accessory root no such long stretch of groove was found except weak depression present in the vicinity of the root branching. The root canal was not detected in the accessory root even by means of x-ray examination.
