Final answer:
The highest success rate for replantation of a permanent tooth occurs when the tooth is replanted within 30 minutes of being knocked out.
Step-by-step explanation:
The success rate for replantation of permanent teeth is highest when the tooth is replanted within 30 minutes of the avulsion. Dental avulsion is a medical emergency where a tooth is knocked out of its socket, and immediate action can often save the tooth. For the best chance of success, the tooth should be handled carefully, kept moist, and reinserted into the socket by a dentist as soon as possible. Damage to the tooth's cells can be minimized if the replantation occurs within this optimal time frame.