When a molar or premolar has been lost in the upper jaw, sometimes the bone becomes too thin to support a dental implant. The sinus pocket above could be damaged if an implant were placed.
A procedure called a sinus lift can add bone to the area and make it stable enough to place an implant. The dental surgeon will open an area around the missing tooth and add material to increase the supporting structure for the implant. Although it may take several months to become integrated with the original bone, this ensures a much stronger and reliable location to place the implant.