Autotransplantation of immature second premolar combined with alveolar ridge splitting: A long-term (6-year) follow-up case report.

This case report describes a successful autotransplantation procedure for an impacted mandibular left second premolar with incomplete root formation. Despite caries and root resorption, the patient's mandibular left second primary molar was retained. Furthermore, the severe impaction of the mandibular left second premolar ruled out orthodontic realignment. Due to the young age of the patient, dental implantation was not feasible, leading to the selection of autotransplantation as the preferred method for replacing the retained primary molar. To address the insufficient buccolingual width of the recipient site, a combination of piezosurgery-assisted alveolar ridge splitting and guided bone regeneration techniques was employed in this autotransplantation procedure.