Background: Many studies investigated the value of sinus lift with or without different bone substitute materials. However, sinus floor elevation with no graft material except a blood clot under the Schniderian membrane is becoming more popular. This study aims to evaluate both bone quantity and quality around dental implants inserted immediately after indirect graft-less sinus lift. Materials and Methods: Thirteen dental implants were used for the treatment of 8 patients with reduced posterior alveolar height using crystal approached sinus lift with the placement of Gel-Foam as an augmentation material before inserting the dental implant, from May to December 2017, then after 4 months from the surgery, a radiological evaluation was done by using Cone Beam Computed Tomography for assessment of the newly formed bone height and density. Results: preoperative and postoperative radiographic comparison using CBCT scan demonstrated the new bone formation within the compartment created by the sinus membrane elevation procedure with an average gain (2.75, ± 1.5) mm. The mean density of the newly formed bone was (298.1, ±130.1) Hounsfield unit. There is a postoperative increase in the native alveolar bone density around the dental implant from (398.9, ± 146.7) Hounsfield unit to (595.5, ±159.4) Hounsfield unit. Conclusion: There is A potential for a new bone formation of up to 7 mm bone in the maxillary sinus with Gel-foam supplement without the need for bone grafts. The newly formed bone quantity and the quality show promising results of the graft-less sinus lift with simultaneous dental implant insertion.