Concrescence: report of rare complication.

Concrescence is an uncommon developmental anomaly that may influence exodontia as well as periodontal, endodontic, orthodontic and even prosthodontic diagnosis and treatment planning. Unexpected complications arising from this condition may lead to legal complications. To minimize risk and adverse outcome of treatment, consideration should be given to recognizing this condition and, possibly, modifying treatment planning. This article presents an unsuspected case of concrescence with a review of the literature.