Pulpal necrosis after dento-alveolar trauma of immature permanent teeth can cause a substantial problem for both patient and practitioner. Traditional therapy includes apexification with calcium hydroxide or the one-step apical plug procedure with mineral trioxide aggregate. The case presented here illustrates how an immature central incisor in a young individual, in which treatment was planned for a one-step apical plug technique after trauma and subsequent pulp necrosis, displayed root maturation due to the longterm course of the treatment. Schlagwörter: apexification, apexogenesis, crown fracture, immature root, MTA, pulpotomy