Being told you need a bone graft before an implant usually means one thing: the bone where your tooth used to be has thinned, and the implant needs more of it to sit in securely. Grafting rebuilds that bone. It is a routine part of implant treatment, and in most cases its main cost is time, because the new bone needs months to mature.
A sinus lift is a particular kind of graft for the upper back jaw, where the air space of the sinus sits just above the roots of the molars. This article explains why grafts are needed, the main types, what recovery involves and how they affect the timeline.
Bone starts to shrink soon after a tooth comes out
The bone that surrounds a tooth root is maintained partly by the tooth itself. Once the tooth is removed, the ridge begins to remodel. A systematic review of human studies (Tan and colleagues, Clinical Oral Implants Research, 2012) found that six months after extraction, the ridge had lost 29% to 63% of its width and 11% to 22% of its height, with most of the change happening in the first three to six months.
That is why a gap that has been empty for years is more likely to need grafting than a recent extraction, and why some people are offered grafting at the time a tooth is removed. Keeping bone is one of the reasons people choose implants, as our comparison of implants, bridges and dentures explains.
Three kinds of grafting, depending on timing and place
Socket grafting at the time of extraction
When a tooth is taken out and an implant is planned for later, the empty socket can be filled with graft material and covered. This aims to reduce the shrinkage described above, so there is more bone to work with when the implant is placed.
Rebuilding a ridge that has already narrowed
If the bone is too thin or too short, graft material is added to the side or top of the ridge, usually held in place with a protective membrane. Depending on the amount needed, this is done before the implant or at the same appointment.
Lifting the sinus floor
Above the upper molars and premolars, the sinus often expands downwards after teeth are lost, leaving too little bone height for an implant. In a sinus lift, the thin membrane lining the floor of the sinus is gently raised and graft material is placed beneath it. When only a little extra height is needed, this can sometimes be done through the same opening used for the implant. Larger lifts are done through a small window in the side of the jaw. Depending on how much bone remains, the implant is placed during the same surgery or after the graft has healed for several months.
What the graft is made of
Graft material acts as a scaffold that your own bone gradually grows into. Several types are used. Your own bone can be collected from elsewhere in the mouth. Donor bone from human tissue banks is processed and screened. Bone mineral from animal sources, most often cattle, is processed so that only the mineral framework remains. Synthetic bone substitutes are also available. Some grafts combine more than one type.
The choice depends on the size and shape of the defect and how quickly the site needs to heal, and your dentist will explain why a particular material is suggested. Because processed graft materials are a framework rather than living tissue, they are not rejected in the way a transplanted organ can be, although a graft can still heal poorly, for example if it becomes infected or exposed.
The day itself and the weeks after
Most grafting is done under local anaesthetic, much like an extraction. If you are anxious, Lumi offers happy gas, inhaled pain relief, oral sedation and IV sedation. Afterwards it is common to have swelling, some bruising and soreness for several days, usually managed with standard pain relief and cold packs in the first day.
After a sinus lift there are a few extra precautions, because pressure in the sinus can disturb the graft. You will usually be asked not to blow your nose hard, to sneeze with your mouth open, and to avoid flying, diving and heavy exercise for a period your dentist will specify. A small amount of blood from the nose in the first day or two can happen. Persistent bleeding, fever, increasing swelling or a feeling of fluid or air passing between the mouth and nose should be reported straight away.
Day-by-day healing after oral surgery follows a similar pattern to the one in our extraction recovery guide, and our implant surgery recovery timeline covers what comes next.
Graft first, or graft and implant together
Small grafts are often placed at the same time as the implant, which avoids an extra surgery. Larger grafts, and sinus lifts where very little bone remains, are usually left to heal for several months before the implant goes in, so the new bone is mature enough to hold it. The implant then needs its own healing time before the final tooth is fitted.
So a case that needs grafting can take noticeably longer from start to finish. Your dentist should give you an estimated timeline at the planning stage. For the full sequence, see how dental implants work, step by step, or, for a common situation, our article on replacing a back molar with an implant.
Grafting adds to the cost of an implant
Grafts are usually quoted separately from the implant, and the cost depends on the size of the graft, the material used and whether it is a separate procedure. As a general guide, a single implant with crown typically falls between $4,000 and $7,000 in the Sydney market before any grafting. These are market ranges, not Lumi fees. Ask for a written, itemised quote so you can see each stage.
Our dental implant cost guide and full-arch implant cost guide explain what affects the total, and our health insurance article covers how extras cover may help.
Replacing a tooth sooner can mean less grafting
Because most bone loss happens in the first months after an extraction, planning ahead makes a difference. If a tooth has to come out and you are thinking about an implant, discuss socket grafting before the extraction. If a gap is already there, a scan will show how much bone remains and whether a graft is likely.
Questions about grafts and sinus lifts
Does a bone graft hurt?
The procedure is done with local anaesthetic. Most people describe the following days as similar to recovering from an extraction, with soreness and swelling that settle over about a week.
Can I have an implant without a graft?
Often, if there is enough healthy bone at the site. A 3D scan is the way to find out.
Is a sinus lift risky?
It is a well-established procedure, but like any surgery it has risks, including a tear in the sinus membrane, infection or sinus symptoms. These are discussed before treatment, and careful planning with a 3D scan helps reduce them.
If you are considering an implant and want to know whether grafting is likely, we can assess the site with a 3D scan at Lumi Dental in Melrose Park and give you a written plan and timeline. Read more about our dental implants or see the current offers.
