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Dental Implants
If you've already lost a tooth due to periodontal disease or other reasons, you may be interested in dental implant to replace the missing tooth.

When it comes to replacing one or more teeth in your mouth, a dental implant is often the treatment of choice and is also one of the most conservative treatments for tooth replacement. Implants are biocompatible posts that replace the roots of your missing teeth. They are physically and biologically designed to attach to your jaw bone and become the foundation for a natural looking restoration.

Your new tooth or teeth will have excellent stability and strength, and will look and feel like your natural teeth.
An implant post is surgically placed into the area where the tooth is missing. In a few months bone will fuse to the implant.
Implants are prescribed to replace a missing tooth or teeth.
A customized crown or bridge is permanently cemented to the implant.
Implants restore the natural beauty, function, and health of teeth

However, in the molars (back teeth) area of the upper arch, there is the maxillary sinus (an air filled space inside the skull).  If the sinus is too low for implant placement, the sinus membrane will then need to be elevated and bone graft placed prior to the implant surgery.  X-rays and sometimes CT scan is required to determine the need for the sinus elevation procedure.  Sinus elevation can be done either by using the osteotome technique (in which the implant can be placed at the same time), or a lateral window technique (in which the implant is usually placed 4-6 months afterward).
Thin ridge
Gained bone width after augmentation
Low maxillary sinus 
Sinus membrane elevated
With bone graft
Implant placed
Lateral Window Sinus Elevation:

If your tooth has been missing for a long time, you may have significant bone loss that there is not enough bone to place an implant.  In a case by case bases, bone augmentation is needed to help you grow back some bone prior to implant placement.
New bone in sinus
Internal Sinus Elevation (Osteotome technique):
Implants with internal sinus elevation
Low Sinus floor