Abstract: PURPOSE: To observe the effect of internal maxillary sinus lift combined with platelet-rich fibrin (PRF) in immediate autotransplantation during tooth extraction. METHODS: A total of 37 patients (40 teeth) with maxillary molar loss admitted to Shenzhen Samii Medical Center from January 2019 to October 2023 were selected. All patients received maxillary sinus lift combined with PRF in immediate autogenous tooth transplantation during extraction with wisdom teeth as donor teeth. The patients were followed up for 1 to 5 years. The success rate of autotransplantation was calculated according to the clinical and imaging examination results. RESULTS: The success rate of 40 transplanted teeth within 1 to 5 years was 100%. The transplanted teeth presented no loosening, no percussion pain, no formation of deep periodontal pockets, and no self-perceived discomfort, and were capable of exercising normal functions. The imaging results demonstrated that periodontal ligament healing was observed around the transplanted teeth and the surrounding alveolar bone, with no signs of root resorption. A hard bone plate image was visible at the edge of the alveolar bone, and bone formation occurred between the root of the transplanted tooth and the floor of the maxillary sinus. CONCLUSIONS: Internal maxillary sinus lift combined with PRF is feasible in immediate autologous tooth transplantation during tooth extraction, and the success rate of autologous teeth is favorable. This procedure expands the indications for autologous tooth transplantation in the posterior maxillary teeth.

Key words: Maxillary sinus lift, Autologous tooth transplantation, Platelet-rich fibrin, Wisdom teeth