Figures 1–8. Figure 1. Surgical site and the incision line located and prepared for surgery. Figure 2. The maxillary periosteum. Figure 3. The lateral wall of the sinus showing a rectangular surface antrostomy. Figure 4. Maxillary sinus membrane elevation. Figure 5. Maxillary sinus grafted with demineralized freeze-dried bone allograft (DFDBA) and cortical cancellous freeze-dried bone allograft (CCFDBA) (control). Figure 6. Double syringe containing platelet-rich plasma (PRP) and bovine thrombin–calcium chloride. Figure 7. Allograft + PRP. Figure 8. Maxillary sinus grafted with DFDBA + CCFDBA + PRP (test)