A sinus lift (also known as sinus floor elevation or sinus augmentation) is a surgical procedure for bone augmentation in the lateral upper jaw. The goal is to create sufficient bone volume so that dental implants can be securely and permanently anchored.
To understand why a sinus lift is necessary, it helps to look at the anatomy: The maxillary sinus (sinus maxillaris) is the largest of the paranasal sinuses and is located directly above the posterior tooth region of the upper jaw. It is lined with a thin mucous membrane called the Schneiderian membrane (membrana Schneideri). The jawbone between the oral cavity and the maxillary sinus is often naturally thin in this area — in some people, the bone height is only a few millimeters.
After the loss of posterior teeth in the upper jaw, a dual process begins: On one hand, the jawbone deteriorates because the chewing stimulus is absent (bone atrophy). On the other hand, the maxillary sinus naturally expands over the course of life (pneumatization). Both factors together mean that the remaining bone height is often insufficient for an implant — an implant typically requires at least 8-10 mm of stable bone.
During a sinus lift, the Schneiderian membrane is carefully detached from the sinus floor and repositioned upward (cranially). Bone graft material is then placed into the created space — either autogenous bone, bone substitute material, or a combination of both. Over the following months, this material is remodeled by the body into load-bearing, native bone. Only then — or with sufficient primary stability, simultaneously — can the implant be placed.
The sinus lift is one of the most thoroughly researched and successful procedures in dental implantology. With a success rate of over 95%, it is considered the gold standard for bone augmentation in the posterior upper jaw region.