Although dental implant success rates are high, there are cases in which the implant will fail. Most cases of implant failure can be prevented if the patient maintains his or her oral health and chooses a qualified implant dentist to plan and perform the procedure. Dental implants are more likely to fail in the maxilla (upper jaw) than in the mandible (lower jaw). Possible reasons for implant failure include:
George Washington (1732–1799) suffered from problems with his teeth throughout his life, and historians have tracked his experiences in great detail.[14] He lost his first adult tooth when he was twenty-two and had only one left by the time he became president.[15] John Adams says he lost them because he used them to crack Brazil nuts but modern historians suggest the mercury oxide, which he was given to treat illnesses such as smallpox and malaria, probably contributed to the loss. He had several sets of false teeth made, four of them by a dentist named John Greenwood. None of the sets, contrary to popular belief, was made from wood or contained any wood.[16] The set made when he became president was carved from hippopotamus and elephant ivory, held together with gold springs.[17] Prior to these, he had a set made with real human teeth,[18] likely ones he purchased from "several unnamed Negroes, presumably Mount Vernon slaves" in 1784.[19] Washington's dental problems left him in constant pain, for which he took laudanum.[20] This distress may be apparent in many of the portraits painted while he was still in office,[20] including the one still used on the $1 bill.[21][a]
An overdenture is a removable dental prosthesis that covers and rests on one or more remaining tooth roots. A removable partial denture is a dental prosthesis that replaces some teeth and is built around existing natural teeth. Both the overdenture and the removable partial denture may be connected to the remaining tooth roots or remaining natural teeth with anchors made of metal or plastic. These connections improve stability and the retention of both prostheses.
