This case describes the treatment of a horizontal root fracture with dislocation of a left central maxillary incisor. A 17-year-old male patient presented himself 17 days after a sports accident without any expedient therapy. Since repositioning of the tooth failed, extraction of both tooth segments and extraoral root canal treatment of the coronal segment was conducted. The coronal fragment was replanted and fixed with a rigid splint for 4 weeks in its physiological position. Follow-up examinations from 1-6 years showed validity of treatment. An expected infraposition of the replanted tooth was recognised after 24 months. Then 6 years after the intentional replantation of the coronal tooth segment, the measurement of the infraposition was approximately 1 mm. Keywords: dislocation, horizontal root fracture, replantation, rigid splinting, root canal treatment