Comparison of Deproteinized Bovine Bone Mixed With Injectable Platelet Rich Fibrin Versus a Sole Deproteinized Bovine Bone "TUTOGEN BONE" in Sinus Floor Elevation With Simultaneous Implant Placement. A Randomized Clinical Trial

28 recruited patients indicated for sinus floor elevation with simultaneous implant placement . they were divided into two groups. first group was assigned for placement of deproteinized bovine bone solely, while the other group was assigned for the placement of mixture of injectable platelet rich fibrin with deproteinized bovine bone into the sinus after implant placement.