What tooth anomaly is characterized by fusion after root formation is completed?

The anomaly of tooth development characterized by fusion after root formation is completed is known as concrescence. This condition occurs when two adjacent teeth become joined by cementum after their roots have fully formed.

Concrescence typically involves the roots of two or more teeth that have come into close proximity to each other, leading to a union post-eruption. Unlike fusion, which involves the combining of two developing tooth germs before the root formation is complete, concrescence does not affect the crowns during development but rather results from a post-eruptive event.

Understanding concrescence is crucial for dental professionals as it can impact treatment planning, particularly in cases of extraction or restorative procedures, where recognizing the fused roots is important for avoiding complications.