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Introduction: Sinus augmentation is also termed as sinus lift, sinus graft, sinus procedure or maxillary sinus floor augmentation. It is a surgical procedure which aims to increase the amount of bone in the posterior maxilla by lifting the lower Schneiderian membrane (sinus membrane) and placing the bone graft. The procedure is performed when the floor of the sinus is too close to an area where dental implants are to be placed.   History: In 1980, Boyne and James reported on elevation of the maxillary sinus floor in patients with large, pneumatized sinus cavities as preparation for the placement of implants. In 1994, Summers described a crestal approach, using tapered osteotomes with increasing diameters. Etiology: The maxillary sinus grows by a bone remodeling process as age advances. This physiological process is accompanied with increased tooth resorption due to tooth loss that leads to decrease in bone height. The lowering of the sinus can be caus