Transient Apical Breakdown in Subluxated Maxillary Incisor

[Abstract: ]Although there have been numerous reports of rebascularization of pulp in cases of luxation injury to teeth with immature roots, it rarely occurs in teeth with complete root formation. This phenomenon is known as transient apical breakdown(TAB)and pulp canal obliteration(PCO)which occurs following it. but there have been few reported cases. We here report the course of a case in which TAB occurred in a central maxillary incisor diagnosed as being subluxated. The patient was a 24-year-old man. He presented at our hospital with a chief complaint of pain in the central maxillary incisor and bleeding from the gingiva after being struck by a child's hand in the incisor region. Because he was undergoing orthodontic treatment at the time, no displacement of the tooth or avulsion from the alveolar socket was evident. Subluxation was diagnosed, and patient condition wasmonitored without any endodontic treatment. When he was examined at the Department of Endodontics, discoloration of the crown was evident and vital reaction of the pulp was absent, but two months later, crown discoloration and pulp vital reaction recovered. Radiography nine months later showed pulp canal obliteration, which was regarded as following the course of TAB, and the patient currently remains under observation. This case suggests that regeneration of the vasculature may occur even in teeth with complete roots, if the severity of traumatic injury is low.