Occurrence of the fused permanent mandibular lateral incisor and canine

Fusion is the union of two normally adjacent tooth germs resulting in the formation of a single large tooth. The incidence of fused teeth is 0.1% in the permanent and 0.5% in the primary dentitions and it may be unilateral or bilateral. The purpose of this article is to report a rare case of unilateral fusion of permanent mandibular lateral incisor and canine with two pulp chambers and a single root canal.