What is a common cause of failure in avulsion replantation?

A common cause of failure in avulsion replantation is external resorptive defects. When a tooth is avulsed, it is critical for the periodontal ligament (PDL) cells on the root surface to remain viable for successful reattachment. External resorption can occur when those PDL cells are damaged during the avulsion process or if the tooth is not replanted promptly. The presence of resorptive defects can hinder the healing and integration of the tooth back into the alveolar bone, ultimately leading to the failure of the replantation procedure.

This issue highlights the importance of the condition of the tooth and the surrounding structures at the time of replantation, as well as the need for immediate and proper care. Factors such as fractured roots or improper storage of the tooth may pose risks, but external resorption has a more direct impact on the biological success of the replantation process. Additionally, patient non-compliance with aftercare could influence the overall healing process, but it is the presence of external resorptive defects that most significantly compromises the outcome of avulsion replantation.