Undiagnosed intrusion of a maxillary primary incisor tooth: 15-year follow-up.

J. rauma to the human anterior primary dentition results in luxation injuries in 62-69% of the cases.The most common forms of injury to the anterior primary dentition are intrusion and extrusion. When there is complete intrusion of the primary tooth into the alveolar bone, the only way to differentiate between intrusion and avulsion is by radiographic examination. The following report describes a case in which an intruded primary tooth remained undiagnosed for 11 years. At age 12 the intruded primary tooth was discovered and diagnosed as a mesiodens. Further examination and treatment disclosed that the socalled mesiodens was an intruded primary tooth.