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Sinus grafting procedures represent today a predictable solution allowing implant placement in atrophic posterior maxilla with high implant success rate. Several techniques and different grafting biomaterials have been used clinically, depending on residual bone, patient’s needs and implantation protocols. In this presentation, we will give a critical review of different sinus grafting techniques (lateral approach, crestal approach) based on clinical long term results along with radiographic and histological aspects.