Which scenario describes an incorrect preparation of a root during avulsion of a permanent tooth?

The scenario involving an extraoral dry time of more than 60 minutes, followed by soaking the tooth in stannous fluoride before replanting, describes an incorrect preparation of a root following the avulsion of a permanent tooth.

In the management of an avulsed tooth, the key factor is the time the tooth is outside the socket. If a tooth has been dry for an extended period, the vitality of the periodontal ligament cells diminishes significantly, making successful reimplantation unlikely. Soaking the tooth in stannous fluoride does not provide any benefit in this context; rather, it may further compromise the periodontal ligament's viability.

In contrast, rinsing and replanting the tooth within an appropriate time frame, or using suitable solutions if the dry time is minimal, are critical to preserving the tissue surrounding the tooth and improving the chances of its successful reimplantation. The inclusion of using calcium hydroxide or antibiotics like doxycycline in certain time-sensitive scenarios is a common practice but is irrelevant if the avulsion occurs after too much time without moisture. Thus, the correct treatment protocol emphasizes the significance of the extraoral dry time and the appropriate handling of the tooth during this interval.