Which of the following conditions would NOT necessitate the use of a flexible splint?

The correct choice indicates a scenario where a flexible splint is not required. An avulsed tooth with less than 60 minutes extraoral time refers to a situation where the tooth has been completely displaced from its socket but has been replanted relatively quickly. In such cases, the primary concern is to maintain the vitality of the tooth and promote healing rather than stabilize it using a splint. Quick management and proper replantation followed by appropriate follow-up care is usually sufficient.

In contrast, other conditions like subluxation, non-displaced fractures, and intrusion would typically require the use of a flexible splint. Subluxation involves a loosened tooth that may benefit from stabilization to allow for proper healing. A non-displaced fracture still maintains the alignment of the tooth, but supporting it with a splint can help ensure it stays in position during the healing process. Intrusion, where a tooth is forced into the socket, also creates significant risk for complications; thus, splinting can help stabilize the tooth as it re-erupts and heals.

In summary, the lack of necessity for a splint in the case of an avulsed tooth reintroduced within a safe timeline stands apart from the other conditions that inherently imply a need for