Dental implants are replacement tooth roots. Implants provide a strong foundation for fixed (permanent) or removable replacement teeth that are made to match your natural teeth. The tooth root implant, which is a small post made of titanium, is placed into the bone socket of the missing tooth. As the jawbone heals, it grows around the implanted metal post, anchoring it securely in the jaw. The healing process can take from six to 12 weeks.
Once the implant has bonded to the jawbone, a small connector post -- called an abutment -- is attached to the post to securely hold the new tooth. To make the new tooth or teeth, your dentist makes impressions of your teeth, and creates a model of your bite (which captures all of your teeth, their type, and arrangement). The new tooth or teeth is based on this model. A replacement tooth, called a crown, is then attached to the abutment.
For more information visit: http://www.webmd.com/oral-health/guide/dental-implants?page=2