When a molar is extracted without the socket being grafted, the maxillary sinus will enlarge, overrunning space that was occupied by the tooth and surrounding bone. When a patient decides to receive implants, the available bone will be limited and the maxillary sinus will be in the way. These factors limit the length of the implant. The surgical elevation of the thin membrane that surrounds the maxillary sinus is known as sinus lifting. Once this membrane is elevated in conjunction with the walls of the sinus, will create a compartment that is filled with bone graft material. Five months later, this bone graft material should turn into bone allowing for implants to then be placed.