A single prosthesis (crown) is used to replace one missing tooth- each prosthetic tooth attaches to its own dental implant. A partial prosthesis (fixed bridge) can replace two or more teeth, and may require only two or three dental implants. A complete dental prosthesis (fixed bridge) replaces all the teeth in your upper or lower jaw. A removable prosthesis (over denture) attaches to a bar or ball in socket attachments, whereas a fixed bridges and screw in dentures are permanent and removable only by the dentist. The number of dental implants varies depending upon which type of complete prosthesis is recommended.