Prosthesis
 A prosthesis is a replacement  for a missing body part.In dentistry it is used as a general name for a single tooth or for several teeth and missing tissue.More than one prosthesis are prostheses.The prosthesis can be a removable or a fixed.
Removable prosthesis
Removable prosthodontics includes replacing missing teeth and tissue with appliances that the patients themselves can take in and out of their mouth,such as dentures (which replace an entire arch of missing teeth) and partial dentures (which replace one or more missing teeth).
Fixed prosthesis
Fixed prosthodontics includes replacing missing and/or broken teeth and tissue with restorations that the patient cannot take in and out,such asveneers,crowns,bridges,and implants.