The human skull has several cavities or air spaces called sinuses. When the sinus is enlarged and intrudes on areas where we want to place dental implants, bone or bone growth stimulation material is placed into the sinus. This procedure only affects the maxillary sinuses, which are located just over the molar teeth in the upper jaw. The side of the maxillary sinus is opened and the bottom is raised so it will fill in with bone. Several months later, dental implants can be placed in solid bone.

An "Osteotome Lift" is a surgical procedure that raises the floor of the sinus directly over where the implant is placed. This can be done without actually opening the sinus.