A sinus lift is a surgical procedure that adds bone to your upper jaw, specifically in the area between your molars and premolars. It’s done when there isn’t enough bone height to securely anchor a dental implant. The surgeon places bone graft material between your jawbone and the sinus cavity above it, creating a foundation that your natural bone gradually grows into over four to twelve months.
Why Some People Need One
Your upper jaw sits directly below your maxillary sinuses, which are air-filled spaces next to your nose and below your eyes. When you lose back teeth in the upper jaw, the bone in that area naturally shrinks over time. The sinus cavity can also expand downward into the space where bone used to be, leaving even less material to work with.
Dental implants need a certain depth of bone to hold securely. When the remaining bone height drops to about 4 millimeters or less, it’s considered severely deficient for implant placement. At 2 millimeters or less, the situation becomes particularly challenging. A sinus lift raises the floor of the sinus cavity and fills the space with grafting material, essentially rebuilding the bone so an implant has something solid to grip.
Two Main Surgical Approaches
Surgeons use two techniques depending on how much bone you have left and how much needs to be added.
The lateral window approach is the more traditional method. The surgeon makes a small opening in the side of the gum tissue, cuts a window into the bone, and gently pushes the sinus membrane upward. Graft material fills the space beneath the lifted membrane. This approach is typically recommended when bone height is very low (under 4 or 5 millimeters) and a larger amount of bone needs to be built up.
The crestal approach accesses the sinus from the top of the jawbone ridge, through the same opening where the implant will eventually go. It’s less invasive. Research comparing the two techniques in patients with less than 5 millimeters of remaining bone found both achieved similar bone gain, but the crestal approach resulted in less pain, faster wound healing, and an easier overall experience for patients.
What the Bone Graft Is Made Of
The graft material acts as a scaffold, giving your body a structure to build new bone around. Several types are used:
- Your own bone (autograft): Considered the gold standard because it contains living cells that actively stimulate new bone growth. The downside is it requires harvesting bone from another site in your body, which means a second surgical area, longer operating time, and additional recovery.
- Donor human bone (allograft): Processed bone from a human donor. It supports new bone formation without needing a second surgical site.
- Animal-derived bone (xenograft): Usually sourced from bovine (cow) bone. These grafts favor long-term stability and are widely used in sinus lifts.
- Synthetic materials: Lab-made options like calcium phosphate compounds and bioactive glasses. These are versatile, biocompatible, and can be engineered with specific properties to encourage bone growth.
Your surgeon will recommend a graft type based on how much bone you need, your health history, and the clinical situation. Many surgeons use a combination.
Risks and Complications
The most common complication is a tear in the sinus membrane, the thin tissue lining the inside of the sinus cavity. This happens more often than you might expect. Published rates range from 10% to over 40% of procedures, depending on the study and the patient population. Tears are more likely when the remaining bone is very thin (under 3.5 millimeters), when there are bony ridges (called septa) inside the sinus, or when the membrane itself is unusually thin.
A membrane tear doesn’t automatically mean the procedure fails, but it does increase the risk. One large study of 359 sinus augmentations found that about 11% of cases with a torn membrane ultimately failed, compared to just 3.4% of cases where the membrane stayed intact. The risk was highest in patients who had less than 3 millimeters of bone to start with. Small tears can often be repaired during surgery and the procedure continued. Larger tears may require the surgery to be stopped and reattempted later.
Other possible complications include infection, swelling, and sinus congestion, though these are less common and usually manageable.
What Recovery Looks Like
The first 48 hours involve the most swelling and discomfort, concentrated around your cheeks and upper jaw. Pain is typically manageable with prescribed medication. By days three through seven, swelling starts to go down, though bruising around the cheeks may appear. Most people can return to light daily activities during this window but should still avoid anything physically strenuous.
Weeks two through four mark a turning point. Swelling and bruising resolve, and you can start eating a wider range of soft foods. Beneath the surface, the bone graft is beginning to integrate with your existing bone.
Full healing takes four to six months. During this time the grafted area becomes denser and stronger, building the solid foundation needed for implant placement. In some cases, it can take up to twelve months. Your surgeon will use imaging to confirm the bone is ready before scheduling implant surgery.
Aftercare Rules That Matter
The most important restriction after a sinus lift is avoiding anything that creates pressure in your nasal or sinus cavity. This means no blowing your nose for at least four weeks. If you need to sneeze, sneeze with your mouth open. Don’t drink through straws, and don’t spit. These actions can create pressure changes that disrupt the healing graft or tear the sinus membrane.
Heavy lifting, blowing up balloons, and playing wind instruments are all off-limits for the same reason. Scuba diving and flying in pressurized aircraft should also be avoided during the initial healing period. Smoking should be stopped for at least two weeks, though quitting entirely gives you the best chance of a successful outcome since smoking significantly impairs bone healing.
Cost and Insurance Coverage
Sinus lifts typically cost between $1,500 and $5,000, with the price varying based on the complexity of the procedure, the type of graft material used, and your geographic location. Some dental insurance plans cover a portion of the cost, particularly if the procedure is deemed medically necessary rather than purely elective. Many dental offices also offer payment plans or work with medical financing companies to help spread out the expense.
Keep in mind that the sinus lift cost is separate from the implant itself. The total investment for a sinus lift plus implant placement can be substantially higher, so it’s worth getting a full treatment estimate upfront.