Evaluation of Implants Placed Without Bone Grafts in Two Different Sinus Floor Elevation Techniques.

a Full thickness flap will be elevated at the edentulous site with two vertical releasing incision and then the preparation of osteotomy will be prepared following standard implant system protocol preparation of the osteotomy. Drilling will be done gently till reaching 0-1mm from the sinus floor, then implant placement will take place and the implant itself will be used to gently elevate the sinus up to 3-5mm.

a full-thickness flap will be elevated at the edentulous site with two vertical releasing incisions extending to the vestibule for better reflection and exposure to the lateral wall of the sinus. The lateral antrostomy will be prepared in the lateral sinus wall using rotary bur no. 8 to provide adequate access to remove the thin to thick cortical bone and to expose the thin sinus membrane. The membrane will be elevated across the sinus floor and up the medial wall and this elevation must extend anteriorly-posteriorly to provide the exposed sinus floor. Drilling will be done gently till reaching 0-1mm from the sinus floor, then implant placement will take place