Maxillary sinus lift is a surgical procedure applied to extensive resorption of the alveolar ridge in a distal region of the upper jaw. Bone resorption is a result of pneumatization of the maxillary sinus usually after the loss of molars, less frequently premolars in the upper jaw. Before the procedure it is necessary to take a medical history and do a clinical and radiological examination in order to avoid possible complications. Radiological evaluation determines anatomical shape of the sinuses, the height of the bone ridge or any pathological changes. Sinus lift procedure has certain contraindications, as there are pathological changes of mucous membranes of the sinuses, whether in the form of sinusitis, cysts or a tumor mass.A sinus lift procedure is achieved by increasing the ridge in the upper jaw, which enables the placement of dental implants. Delayed implant placement is applied to large bone losses, while the immediate implant placement is used when there are more than 4 mm in height of the bone ridge. There are many sinus lift techniques. The lateral sinus lift technique is used if there are less than 6 mm in height of the bone ridge, while the internal or transcrestal technique is applied when there is more than 7 mm in height of the bone ridge. When sinus lift is necessary, the gap between bone and membrane is also augmented with various bone materials, which can be autogenous, allogeneic, xenogeneic or allografts, in order to ensure satisfactory implant stability.As with any surgery, there are potential complications that can occur during or after the procedure. The most common complication during the procedure is a rupture of Schneider's membrane and profuse bleeding while the occurrence of sinusitis, the most common complication after the procedure.The primary purpose of maxillary sinus lift is the possibility of placing dental implants and prostetic restoration as well as the functional and aesthetic restoration of teeth.