Retained tooth vitality after 15 years' displacement into floor of mouth. Report of a case.

A case in which a tooth traumatically displaced into the floor of the mouth retained its vitality for 15 years is reported. Although the presence of the tooth and soft-tissue cuff which appeared to represent the original attached gingiva presented a source for complications, no significant pathologic changes were noted. The requirement for a thorough radiographic examination before definitive treatment of maxillofacial injuries is emphasized.