When teeth have to be removed and replaced with dental implants the same day, the implant is frequently not the same shape as the root or roots that were taken out. If the space between the remaining bone and the dental implant is too large, some bone grafting material must be placed to help the body fill this space with bone.
After teeth have been missing for a period of time, the remaining bone shrinks from a lack of stimulation. Sometimes to place dental implants in this type of area, bone grafting is needed to encourage the body to replace the bone missing. Another way to expand the bone volume is to physically move the existing bone to a new position while placing the dental implant.