A case of fused upper deciduous incisor teeth and deciduous supernumerary tooth.

Abstract

This paper reports a rare case of a fused deciduous tooth consisting of two upper incisors and a supernumerary tooth found in a 6-year-old girl with good general health. Macroscopic and X-ray examinations showed nearly complate fusion between two upper incisors and the supernumerary tooth, and more than ½ of each root was absorbed. No significant changes in number and form of the permanent teeth were noted by X-ray photographs. Histopathologic and contact microradiographic examinations revealed that the enamel, dentin and cementum of three deciduous teeth were united. It is well known that various developmental disturbances occur not only in permanent teeth but also in deciduous ones, however, the review of the literature in Japan yields only four cases of fused teeth composed of three deciduous teeth.