Autotransplantation of an ectopic impacted premolar with sinus lift and allogenic bone graft

Aim This article presents a case report of autogenous tooth transplantation to a site which had insufficient bone volume using a sinus lift and allogenic bone graft. Summary An ectopic, fully impacted premolar tooth was autotransplanted from its ectopic impaction site into its original site, where there was insufficient recipient vertical bone volume because of sinus expansion. The deciduous tooth was extracted from the recipient site, and the sinus membrane detached and elevated via the alveolar socket. Allogenic bone grafting was performed, and the impacted premolar was transplanted into the prepared site. To improve adaptation, the recipient site was prepared using a rapid prototype tooth model, a replica tooth which allowed complete socket preparation in advanced of the actual removal of the donor tooth. The donor tooth was fixed with sutures and maintained for 17days to allow physiologic movement. Root canal treatment was initiated 24days after autotransplantation, and an intra-canal medicament was used for 4months. Canal filling was completed 5months after autotransplantation. There was no root resorption of the transplanted tooth, and the grafted bone was well preserved and had no signs of infection. Key learning points • When the recipient bone volume is insufficient, autotransplantation can be preceded by bony augmentation. • The preparation of the recipient tooth socket using a tooth replica from CBCT reduces the extra-oral time of the actual tooth and promotes better periodontal ligament healing. • Careful evaluation of the pulp status of the donor tooth is important in advance of timely endodontic treatment.