Unusual healing of apical root fracture

A 23-yr-old woman received a blow to the symphysis region of the mandible. She sustained several injuries including a root fracture of the mandibular left lateral incisor. The pulp in the coronal root portion of that tooth became necrotic. A radiolucent lesion developed at the apex of the coronal root portion, and the apical root fragment was displaced 2 1/2 mm. Following endodontic treatment of the coronal segment, the apical fragment returned to its original position.