A sinus lift is a surgical procedure that adds bone to your upper jaw between your molars and premolars, creating enough support to hold a dental implant. It works by lifting the membrane lining your maxillary sinus upward and packing bone graft material into the space below it. The procedure is one of the most common and successful in implant dentistry, with graft success rates around 98% and implant success rates around 97% over long-term follow-up.
Why a Sinus Lift Is Needed
Your maxillary sinuses sit just above the roots of your upper back teeth. When those teeth are lost, two things happen. First, the jawbone that used to support those teeth begins to shrink, a natural process that starts soon after extraction. Second, the sinus cavity itself gradually expands downward into the space the bone once occupied. Together, these processes can leave you with a thin shelf of bone that’s too shallow to anchor a dental implant.
Dental implants in the upper back jaw typically need a solid foundation. A sinus lift is generally recommended when the remaining bone height is 10 mm or less. Below 5 mm, the procedure becomes more involved and requires a more extensive surgical approach. Pre-implant bone height under 5 mm is also associated with lower implant survival rates, which is one reason surgeons want to build up as much bone as possible before placing the implant.
Two Surgical Approaches
The technique your surgeon chooses depends mainly on how much bone you have left.
Lateral Window Approach
This is the traditional method, used when remaining bone height is 5 mm or less. The surgeon makes an incision in your gum tissue along the upper jaw and peels it back to expose the bone. A small rectangular window is then cut into the side of the bone, revealing the thin membrane (called the Schneiderian membrane) that lines the sinus floor. That membrane is gently lifted upward, and the space created underneath is filled with bone graft material. A collagen membrane is placed over the window to protect the graft, and the gum tissue is stitched closed.
In some cases, implants can be placed at the same time as the graft. In others, the graft needs to mature first, and the implant is placed months later in a second procedure.
Crestal (Osteotome) Approach
When you have more than 5 mm of remaining bone, a less invasive option is available. Instead of opening a window from the side, the surgeon works through the same small hole where the implant will eventually go, at the top of the jaw ridge. Specialized instruments called osteotomes are used to gently tap the sinus floor upward, pushing the membrane with it. Because the surgeon can’t directly see the membrane during this approach, careful pre-surgical imaging is essential. The tradeoff is a smaller incision, less swelling, and a shorter recovery.
Types of Bone Graft Material
The space under the lifted membrane needs to be filled with material that encourages new bone growth. Four main categories are used, and all produce similar long-term success rates:
- Autogenous bone (your own bone): Harvested from another site in your body, often the hip or chin. Long considered the gold standard because it contains living bone cells. In a 15-year study, graft success was about 97%.
- Xenograft (animal-derived bone): Most commonly sourced from bovine (cow) bone that has been processed to remove all organic material. This category showed the highest success rate in the same study at 99.5%.
- Allograft (human donor bone): Obtained from tissue banks and processed for safety. It provides a scaffold for your own bone to grow into.
- Alloplastic (synthetic): Lab-made materials that contain no biological tissue. These make up about 60% of the bone substitute market and achieved a 99% graft success rate in long-term follow-up.
There was no statistically significant difference in outcomes between these materials, so the choice often comes down to your surgeon’s preference, availability, and whether you want to avoid a second surgical site for bone harvesting.
What Recovery Looks Like
The first week involves the typical post-surgical symptoms: swelling, mild to moderate discomfort, and possibly minor bleeding from the nose or surgical site. Most people manage pain with over-the-counter medication. The critical recovery rules center on one thing: protecting the healing membrane from pressure changes in your sinus.
For at least four weeks after surgery, you should not blow your nose. If you need to sneeze, do it with your mouth open. Avoid drinking through straws, spitting forcefully, playing wind instruments, blowing up balloons, or lifting heavy objects. Anything that creates pressure in your nasal cavity risks displacing the graft or tearing the membrane.
The bone graft itself takes four to six months to fully integrate with your existing bone. Only after this healing period is the site ready for implant placement. If the implant was placed at the same time as the graft, you’ll still need to wait several months before the implant can bear the load of a crown or prosthetic tooth.
Risks and Complications
The most common complication is perforation of the sinus membrane during surgery, which happens in roughly 20% to 25% of cases (some studies report up to 42%). Small tears can be repaired on the spot using collagen tape, special sutures, or tissue adhesives. When the tear is larger than about 6 mm and can’t be adequately closed, the surgeon may stop the procedure and let the membrane heal before trying again.
Membrane perforation raises the risk of sinus infection during recovery. About 10% to 20% of patients with a perforation develop acute sinusitis afterward, compared to 1% to 5% of patients whose membrane stays intact. Most of these infections respond to oral antibiotics. However, patients who do develop post-operative sinusitis have a notably higher graft failure rate (30%) compared to those who don’t (5%), which is why preventing and quickly treating infections matters.
Despite these risks, overall outcomes are excellent. A 15-year retrospective study of 757 implants placed in grafted sinuses found that membrane perforation did not significantly reduce long-term success rates. Even patients with less than 4 mm of starting bone height had implant success rates above 96%.
Who Is Not a Good Candidate
Certain conditions make a sinus lift inadvisable or require treatment before the procedure can move forward. Active sinus infections, sinus cysts, polyps, or tumors in the maxillary sinus all need to be resolved first. A history of chronic sinusitis or allergic rhinitis is a relative concern that your surgeon will weigh carefully.
Heavy smoking is a significant risk factor, both for membrane perforation and for post-operative sinus infection. Severe, uncontrolled systemic disease, prior high-dose radiation to the upper jaw, and severe bruxism (teeth grinding) are also reasons a surgeon may advise against the procedure or recommend alternatives.
Cost
A sinus lift typically costs between $1,500 and $2,500 per side. If both sides of your upper jaw need augmentation, you could pay up to $5,000 for the sinus lifts alone, before the cost of the implants themselves. Dental insurance coverage varies widely, and many plans classify it as a surgical procedure rather than a routine dental one, which can affect reimbursement. The bone graft material, imaging, and any additional membranes or growth factors may be billed separately depending on the practice.