Figures 1–4. Figure 1. Preoperative radiograph illustrating large pneumatized maxillary right sinus. Figure 2. Elevation of muccoperiosteal flap with access to demarcated lateral window osteotomy site before elevation of Schneiderian membrane. Figure 3. Collagen membrane (Biomend) placed onto newly elevated sinus floor before graft placement. Figure 4. Sinus grafting with mineralized allograft (Puros).