AIM:The aim of the study was to evaluate the stability of the implants placed simultaneously after graftless sinus floor elevation using titanium mesh and to investigate whether sinus membrane elevation using titanium mesh with simultaneous implant placement)one-stage technique(without grafting materials constitute a valid technique for bone augmentation of sinus floor.Material and methods: The study group comprised 12 patients in whom a total of 17 implants are inserted simultaneously in 12 sinuses.Only blood clots occurring from bleeding due to the surgical procedure filled the secluded compartment space beneath the lifted sinus membrane, where the stable titanium mesh allowing for stable blood clot formation.Results:All implants achieved adequate primary and secondary stability except one implant showed insufficient second implant stability, six months at the stage of prosthesis fabrication, its secondary stability was inadequate to receive the final restoration and postponed for more and longer follow up (later on, this failed implant was lost and replaced). Overall, measurements taken for all placed implant increased over time, 16 implants achieved adequate secondary stability (ISQ2) and was sufficient for satisfactory loading. It was observed that the larger implant diameter improve the initial implant stability while the length did not had any effect on the initial stability.Conclusion:Open graftless sinus lift with simultaneous implant placement resulted in bone formation over a period of 6 months and showed high implant survival rates. The treatment time is shorter and decrease the patient discomfort due to reducing the risks of morbidity related to the harvesting of bone grafts.