What is a Sinus Lift?
The maxillary sinuses are behind your cheeks and on top of the upper teeth. These sinuses are empty, air-filled spaces. Some of the roots of the natural upper teeth extend up into the maxillary sinuses. When these upper teeth are removed, there is often just a thin wall of bone separating the maxillary sinus and the mouth. Dental implants need bone to hold them in place. When the sinus wall is very thin, it is not possible to place dental implants without building up the quantity of bone in the area first through a sinus lift procedure.
The key to a successful and long-lasting dental implant is the quality and quantity of bone to which the implant will be attached. If bone loss has occurred due to injury or periodontal disease, a sinus augmentation can raise the sinus floor and allow for new bone formation. A sinus lift is one of the most common bone grafting procedures for patients with bone loss in the upper jaw. The procedure seeks to grow bone in the floor of the maxillary sinus above the bony ridge of the gum line that anchors the teeth in the upper jaw. By strengthening and growing bone in this location, dental implants can be placed and secured in the new bone growth.
Am I a Candidate for a Sinus Lift Procedure?
A sinus lift may be necessary if you:
- Are missing more than one tooth in the back of your jaw
- Are missing a significant amount of bone in the back of your jaw
- Are missing teeth due to a birth defect or condition
- Are missing most of the maxillary teeth, but require support for dental implants
How is this Oral Surgery Accomplished?
In the most common sinus augmentation procedure, a small incision is made on the premolar or molar region to expose the bone. A small opening is made in the bone, and the membrane lining the sinus is pushed upward. The underlying space is filled with bone grafting material, either from your own body or from a cadaver. Sometimes, synthetic materials that can imitate bone formation are used. After the bone is implanted, the incision is stitched up and the healing process begins. After several months of healing, the bone graft has now been replaced by your own bone and dental implants can be inserted and stabilized in this new sinus bone.
If enough bone between the upper jaw ridge and the bottom of the sinus is available to stabilize the implant well, sinus augmentations and implant placement can sometimes be performed as a single procedure. If not enough bone is available, the sinus augmentation will have to be performed first, then the graft will have to mature for several months, depending upon the type of graft material used. Once the graft has matured, the implants can be placed. The sinus graft makes it possible for many patients to have dental implants when years ago there was no other option besides wearing loose dentures.
A newer surgical technique that is an option for patients who have enough bone to stabilize an implant, is to complete the sinus lift procedure through the implant site itself. This technique is much more conservative and saves the patient a more involved surgery.