To replace one missing tooth or many missing teeth: Each implant is an individual unit that is composed of basically two parts. One is surgically placed in the jaw bone and the second one is the crown on top of the implant to take the shape of the missing tooth and be geometrically similar to the rest of the existing teeth.
Implant in Conjunction with a Bridge
Implants can also be used to cover a large number of missing teeth. In some instances, few implants are surgically placed and used as bridge abutments. For example, you can have 5 implants under a 9-unit bridge.
Implants in Conjunction with Dentures
Similarly, you can have some implants (average of 4) to be surgically placed under the full denture to get a snap effect. This will give the patient complete stability and have the denture fit comfortably in the mouth with no need for adhesives. Other configurations are also available with dentures.