A sinus graft is a surgical procedure that adds bone to your upper jaw, specifically along the floor of the maxillary sinus, to create enough bone volume for a dental implant. It’s one of the most common pre-implant surgeries, typically needed when the bone between your upper jaw and sinus cavity has become too thin to anchor an implant securely. You might also hear it called a sinus lift or sinus augmentation.
Why the Upper Jaw Loses Bone
Your maxillary sinuses are air-filled spaces that sit just above your upper back teeth. A thin layer of bone separates those tooth roots from the sinus floor. When you lose a tooth in that area, the bone that once supported it begins to shrink. Over time, the sinus can expand downward into the space, leaving even less bone to work with. This is especially common when teeth have been missing for years.
Dental implants need a certain depth of bone to fuse with and stay stable. When the remaining bone height drops below about 5 millimeters, there simply isn’t enough foundation. A sinus graft solves this by lifting the sinus membrane upward and packing bone graft material into the space beneath it, essentially rebuilding the jaw from the inside.
How the Procedure Works
There are two main approaches, and which one your surgeon recommends depends primarily on how much bone you have left.
Lateral Window Approach
This is the traditional technique, used when bone loss is more severe (typically under 5 mm of remaining height). The surgeon makes a small opening in the side of the jawbone, carefully lifts the sinus membrane upward through that window, and fills the newly created space with bone graft material. The window is then closed and the site is sutured. This approach costs roughly $2,000 to $5,000 per side, depending on complexity and the graft material used.
Crestal Approach
This less invasive technique accesses the sinus floor through the same opening where the implant will eventually go, rather than cutting a separate window in the bone. It involves less tissue disruption, and studies comparing the two methods show that patients who receive the crestal approach report less postoperative pain and faster healing. Both techniques produce similar amounts of new bone and similar implant success rates. The crestal approach typically costs $1,500 to $3,000 per side.
In some cases, the implant can be placed at the same time as the graft. In others, the graft needs several months to heal and harden before the implant is placed in a second procedure.
What Gets Packed Into the Graft
The graft material acts as a scaffold for new bone to grow into. Surgeons use several types: bone harvested from elsewhere in your own body, processed donor bone, animal-derived bone mineral, or synthetic bone substitutes. A 10-year retrospective study found that all material types produced comparable implant survival rates, with synthetic substitutes performing at 100%, the patient’s own bone at 94.6%, and combination grafts at 85.9%. These differences weren’t statistically significant, meaning the choice of material matters less than you might expect.
Recovery Timeline and Restrictions
The most important rule after a sinus graft is simple: do not blow your nose for at least four weeks. Anything that creates pressure inside your nasal cavity can dislodge the graft material or tear the delicate sinus membrane. That means sneezing with your mouth open, avoiding straws, skipping wind instruments, and not lifting heavy objects. Flying and scuba diving are also off-limits during this period.
For the first 48 hours, you shouldn’t brush the surgical area. Starting the day after surgery, gentle saltwater rinses (half a teaspoon of salt in a glass of warm water) should be done four to five times daily for at least five days. Partial dentures or flippers shouldn’t be worn until your follow-up appointment unless your surgeon specifically says otherwise.
Smoking dramatically increases the risk of graft failure and should be stopped entirely for a minimum of two weeks, though quitting permanently gives the graft the best chance of success.
Watch for warning signs during recovery: unexpected airflow between your mouth and nose, small particles of graft material coming from your nostril, congestion on the side of surgery, or swelling that increases after the third day. Any of these warrant a call to your surgeon.
Risks and Complications
The most common complication is a tear in the Schneiderian membrane, the thin tissue lining the sinus floor. This happens in roughly 10% to 55% of procedures depending on the study, with one large review of 359 sinuses reporting a 41.8% perforation rate. That sounds alarming, but most small tears are managed during surgery and don’t cause long-term problems.
The concern is what happens when a perforation goes unrepaired or is severe. In the same study, grafts placed through a perforated membrane failed 11.3% of the time, compared to only 3.4% when the membrane stayed intact. Among all graft failures in the study, about 71% had a perforated membrane at the time of surgery. Patients with perforations were also far more likely to need a follow-up course of antibiotics (11.3% vs. 1.4%).
Certain factors raise your risk of perforation: bony ridges (called septae) inside the sinus, a naturally thin membrane, prior sinus surgery, or sinus disease. Your surgeon can evaluate these with a CT scan beforehand.
Other possible complications include infection, sinusitis, swelling, wound opening, and, rarely, loss of graft material into the sinus cavity. These are uncommon when the procedure is performed by an experienced oral surgeon or periodontist.
Long-Term Implant Success
The ultimate measure of a sinus graft isn’t whether the bone heals. It’s whether the implant placed in that bone stays functional for years. A 10-year retrospective study found a cumulative survival rate of 90.1% for implants placed in grafted sinuses. Implants with a textured surface performed significantly better than smooth ones, surviving at a rate of 97.5% compared to 84.8%. Modern implants almost universally use textured surfaces, so current outcomes are likely at the higher end of that range.
The overall graft failure rate in large studies hovers around 6% to 7%. The combination of adequate remaining bone height, an intact sinus membrane during surgery, and a textured implant surface gives you the best odds of a successful outcome.
Cost and Insurance
A single-side sinus graft typically runs $1,500 to $5,000, with most patients landing in the $2,000 to $3,000 range. If you need both sides done, expect to nearly double that figure. The total depends on which surgical technique is used, the type of graft material, and your geographic area. These prices generally don’t include the implant itself, which is a separate cost.
Dental insurance coverage for sinus grafts varies widely. Some plans classify it as a major procedure and cover a percentage; others consider it part of implant treatment and exclude it entirely. Medical insurance occasionally covers the procedure if it’s related to sinus health rather than purely dental restoration, though this requires specific documentation from your surgeon.