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Endodontic treatment of a fused mesiodens: report of case.

Maxillary incisors rarely contain more than one root canal. The tooth in this instance was unusual because it contained two canals. One canal was necrotic whereas the other had a vital pulp. The tooth appeared to be a mesiodens fused to a permanent central incisor. The root canal of the mesiodens was positioned mesially, and the canal of the incisor, distally, in what appeared to be a common root. During treatment, anesthesia was obtained only after infiltration over both central incisors. This suggested that there was innervation to the tooth from the opposite side. The necrotic canal was treated and filled. Vitality of the pulp in the other canal was preserved.