Which of the following conditions is classified as a failing implant?

A failing implant is characterized by progressive bone loss accompanied by signs of inflammation. This condition indicates that there is ongoing pathological activity affecting the supporting structures of the implant, often associated with peri-implantitis or other complications that can compromise the integrity of the implant. Inflammation is a key indicator that the body is responding negatively to the implant site, which can lead to further tissue damage and eventual implant failure if not addressed.

Other conditions listed do not meet the criteria for a failing implant. For instance, radiographical bone loss without inflammation suggests that there may be some changes in the bone structure, but without the signs of active inflammation, it does not necessarily indicate failure. It can indicate a situation that requires monitoring, but not immediate intervention. Additionally, implants that have been retained successfully with stable bone integration indicate that the implant is functioning as intended, without any signs of failure or complications.