A 12-year-old boy was referred to the Department of Oral and Maxillofacial Surgery of a university clinic, one week after initial treatment related to a dental trauma due to a fall on a swimming pool slide. The treatment by the dentist on duty consisted of repositioning and splinting the maxillary central incisors. However, a radiograph of the affected teeth showed some unrecognizable objects around the left incisor. The nature and localization of the objects were not clear. Therefore, a cone beam computer tomography was produced. This image revealed that the objects were located in the left central incisor’s socket and that this tooth was not repositioned correctly. A retreatment was carried out consisting of removing the objects and repositioning and splinting the left central incisor. Cone beam computer tomography may be of great value in determining the nature and extent of a dental trauma as well as in evaluating the treatment provided.