What Is a Sinus Lift Procedure, and How Is It Used with Dental Implants?

A sinus lift, also called sinus augmentation, is a bone grafting procedure that rebuilds lost bone in the upper back jaw so dental implants have something solid to anchor into. The maxillary sinuses are air spaces that sit directly above the roots of your upper molars and premolars. When teeth are lost back there, the bone beneath the sinus shrinks, and often too little height remains to place an implant safely. A sinus lift raises the sinus membrane and adds bone graft material beneath it, converting a site that cannot receive an implant into one that can.

It is one of the most common grafting procedures in implant dentistry, and one of the most predictable when it is planned well. Here is how it works.

Why Bone Disappears Under the Sinus

Bone exists to support teeth. Once a tooth is gone, the bone that held it no longer has a job, and it begins to recede. The loss can be rapid, often most pronounced in the first three months after an extraction, and a substantial portion of the ridge can be lost within the first year. Periodontal disease, extractions done without a graft in the socket, and each person’s individual anatomy all contribute.

In the upper back jaw this shrinkage has a second dimension: the sinus floor above the site effectively moves closer to the ridge as bone is lost, squeezing the available implant zone from both directions. That is the specific problem a sinus lift solves. If you want to understand whether your situation calls for one, we cover the indications in detail in when a sinus lift is necessary for implant treatment.

What a Sinus Lift Actually Does

During the procedure, the delicate membrane lining the floor of the sinus is gently elevated, and bone graft material is placed into the space created beneath it. The membrane stays intact; the graft sits below it, outside the sinus airspace. Over the following months the graft matures into dense, living bone capable of receiving and supporting an implant. In short, the procedure recreates an operable implant site where one no longer existed.

The Two Types of Sinus Lifts

The internal sinus lift is the conservative version, used when some bone remains but not quite enough. Working through the implant preparation itself, we use a specialized instrument called an osteotome to elevate the sinus membrane a few millimeters and introduce graft material, usually placing the implant at the same visit. It is typically used for one or two implant sites. You can see the full sequence in our closer look at the partial (internal) sinus lift.

Stage 1: Hopelessly Fractured Tooth

Stage 2: Tooth Extracted, Bone Graft Placed

Stage 3: Implant Placed with a Sinus Lift at the Top

The external sinus lift is used when very little or no bone remains beneath the sinus. It is performed as its own procedure, months before implant placement, and rebuilds the entire sinus floor on that side beneath the protective membrane. Once the graft has matured, implants are placed into the new bone. We walk through that technique step by step in what a full (external) sinus lift involves.

Stage 1: No Bone Available to Receive Any Implant

Stage 2: Bone Graft Placed in an External Sinus Lift

Stage 3: Implants Placed in the Matured Bone Graft

Where the Graft Material Comes From

There are several possible sources of graft material. In our practice we use carefully screened bone from a bone bank, combined with a bone growth stimulator made up of biological growth factors and proteins. This approach has served our patients well over many years, producing dense bone that receives and protects the new implant.

How Reliable Is Sinus Grafting?

A large body of published research supports the long-term predictability of implants placed in grafted sinuses. Success, however, is not automatic. It follows from careful 3D imaging, honest assessment of your anatomy, and precision implant placement into the new bone. That is the standard Dr. Gerald Marlin, a specialty-trained prosthodontist with more than 3,900 implants placed and restored, applies to every grafted site.

When the Problem Is Width, Not Height

The sinus lift solves a height problem in the upper back jaw. When the ridge is too narrow to hold an implant, the answer is a different procedure called ridge augmentation, which rebuilds the width of the jaw and typically matures over four to six months before implants are placed. We explain it in what ridge augmentation bone grafting is.

Find Out What Your Jaw Actually Needs

If you have been told you lack the bone for implants, that is the beginning of a conversation, not the end of one. A 3D scan will show exactly what you have and what can be rebuilt. Call 202-244-2101 or request a consultation at Elite Prosthetic Dentistry in Friendship Heights, Washington, DC, and get an answer specific to your anatomy.