Removable restorations, full and partial dentures, are among the most common restorations in dentistry. A partial denture is used when a patient has one or more missing teeth but still has some healthy teeth remaining. A metal or acrylic support is cast custom to the patient's needs. This support has clasps ("hooks") that attach to the healthy teeth to keep the prosthesis in place. Fake teeth fill in the areas where teeth are missing, and it gives a complete smile as well as better chewing ability.
A full denture is made when a patient is missing all of their natural teeth in either the upper or lower arch, or both. These rely on suction or support of the remaining bony ridges. They can be difficult restorations to adapt to, but are useful when there is no other alternative.
Both of these restorations are made to come out each night so that the tissues have a chance to rest. Pathologic infections can develop if these appliances are worn continuously, therefor, you should never wear your denture all day and all night.