Unusual sequelae of a subluxated primary incisor on its permanent successor tooth.

Traumatic dental injuries (TDIs) such as subluxations of primary teeth can have significant consequences on their developing successors. The purpose of this report is to present a 3-year-old boy who encountered subluxation injuries to his primary incisors which subsequently had an unusual consequence on the permanent successor. On the day of the TDI, based on clinical and radiographic examinations, a diagnosis of subluxation of teeth 52, 51 and 61 was made. By age 5, the patient reported that tooth 51 had exfoliated, and consequently, tooth 11 had erupted into the oral cavity, but it was very loose. Eventually, the patient lost the crown of tooth 11 during his routine daily activities. Furthermore, radiographic examination at age 11 revealed a small root-like structure in the tooth 11 region. It is very unusual to have premature loss of a permanent incisor following subluxation to its predecessor. Therefore, the present case serves as a good example to emphasize that even minor TDIs are of considerable importance as they may lead to unexpected consequences.