The conventional procedure for a sinus lift (Caldwell-Luc procedure) requires preparation of a mucoperiosteal flap in the buccal molar region and to cut an oval window in the thus exposed bone, without damage to the subjacent maxillary sinus membrane. The procedure is very invasive and subjects the patient to great stress as a result of substantial swelling and discoloration of up to 10 days, and possibly of pain. This surgical procedure is oftentimes referred to as "open" or "classic" sinus lift. This technique is fraught with many risks and complications because of the limitations of healing potential in the maxillary sinus. In spite of these risks many patients undergo this procedure because of the strong desire to replace missing maxillary teeth with dental implants.