An intruded immature permanent incisor splinted with a mouthguard: A case report

An intruded upper left immature permanent central incisor of a 6-year-and-10-month-old girl was splinted with a mouthguard-type splint because the adjacent teeth could not be used for fixation. She visited our clinic about 1 h after she fell from an iron bar at school and injured her tooth. After repositioning, the incisor was splinted for 4 weeks with a mouthguard fabricated using the pressure molding technique. Although the incisor erupted in the normal position, a radiograph 1 year after the injury showed partial obliteration of the pulp cavity, and total obliteration was observed at 1 year and 10 months. The apical shape of the root was round and the root was shorter than that of the right central incisor. The incisor showed vitality 9 months after the injury using an electric pulp tester and the vitality equaled that of the right incisor at 1 year and 10 months. A mouthguard-type splint is less likely to cause ankylosis compared to rigid fixture and is useful for the fixation of an erupting immature incisor.