The maxillary sinuses are hollow, air-filled spaces located above the back teeth in the upper jaw and in the inner region of the cheek. If the teeth in the posterior region of the upper jaw are lost for various reasons, some loss of bone volume may occur as a result of downward sagging in the sinus cavities. This situation poses a problem due to insufficient bone tissue when implant treatment is to be performed. For a long-lasting and successful implant treatment, in these areas where bone tissue is insufficient, new bone formation can be achieved by increasing the bone tissue in the area with sinus augmentation. It is the most commonly used bone augmentation procedure for patients with bone loss in the posterior region of the upper jaw.