Sinus floor elevation surgery
Maxillary sinus is an air cavity in the upper jaw lined by mucosa. Sinus is a closed cavity having only one communication with the nasal cavity.
Previously, maxillary sinus was believed to control air pressure in the nasal cavity, to decrease relative weight of the scull, to isolate warm air, to enlarge the surface area for smelling and to enhance voice resonance, but none of these theories have ever been proved. Today human sinus is thought to carry no other function than producing mucus and strengthening facial scull.
How Does Sinus Affect Possibilities of Implant Surgery?
Sinus expansion and jawbone atrophy leads to insufficient jaw height which is measured as from bone ridge up to the sinus floor. Jawbone ridge height is the main criterion determining the complexity and prognosis of implantation. Ideal jawbone ridge should be high – then no extra procedures for implant placement would be needed. The only solution for a low jawbone ridge is a sinus elevation procedure.
How Does Sinus Change After Upper Molar Teeth Loss?
After loss of molar teeth jawbone ridge changes into two manners. First of all, during first years after teeth loss, rapid turnover and atrophy alters alveolus (bone supporting teeth). Secondly, sinus pneumatisation due to bone resorption from inside of sinus a sinus expansion takes place. Jawbone ridge becomes smaller because of these two reasons.
At first jawbone quantity is sufficient for implant placement but later it can decrease and sinus elevation procedure becomes essential. The sooner a patient decides to undergo implantology after teeth loss, the easier implant placement will be. On the contrary, sinus elevation will become inevitable if implant surgery is delayed.
What is the Sinus Floor Elevation?
Sinus floor elevation is an operation increasing upper jawbone ridge height upon insertion of bone into the floor of maxillary sinus. The aim of this procedure is to create a sufficient jawbone ridge height for dental implant placement.
Bone is placed into the sinus floor and covered with a special protective membrane. It takes about 6 to 9 months for the blood vessels to grow into the new bone. Afterwards implants can be placed. Sometimes implants can be placed simultaneously with sinus elevation procedure, thus saving 6 to 9 months.