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To evaluate the clinical and radiographic outcomes of endoscope-assisted maxillary sinus floor elevation with platelet-rich fibrin grafting and simultaneous implant placement (PESS) in atrophic maxillae. Twenty-three implants were placed to rehabilitate atrophic maxillae. Patient satisfaction was measured with a visual analog scale (VAS ). CBCT was taken to assess the bone changes for the elevated sites. Twenty-two of 23 implants fulfilling the survival criteria represented a 1-year survival rate of 95.65%. The VAS score decreased with