<unk>  is the complete displacement of a tooth from its socket in alveolar bone owing to trauma. Normally, a tooth is connected to the socket by the periodontal ligament. When a tooth is knocked out, the ligament is torn. Avulsed permanent teeth may replanted, i.e. returned to the socket. Deciduous teeth are not replanted due to the risk of damaging the permanent tooth germ. Immediate replantation is considered ideal, but this may not be possible if the patient suffered other serious injuries. If properly preserved, teeth may be replanted up to one hour after avulsion. The success of delayed replantation depends on the survival of the cells remaining on the root surface. Storage in an environment similar to the tooth socket can protect these cells until the operation.
Dental avulsion
Stingray injury
Avulsion injury
Cerebral laceration
Lisfranc injury
Skull fracture
Barotrauma
Traumatic asphyxia