The following radiograph shows:: (A) Fusion in 22, (B) Gemination in 22, (C) Concrescence in 22, (D) Dilaceration in 21
Answer is B. Gemination
Geminated teeth are anomalies which arise from an attempt at the division of a single tooth germ by an invagination, with resultant incomplete formation of two teeth. The structure is usually one with two completely or incompletely separated crowns that have a single root and root canal. It is seen in deciduous as well as permanent dentition, and in some reported cases, appears to exhibit a hereditary tendency. It is not always possible to differentiate between gemination and a case in which there has been a fusion between a normal tooth and a supernumerary tooth.
Radiological signs
The tooth has a notched incisal margin with a confluent or partially joined pulp canal system.