What is A biologic Failure

A biologic Failure can be defined as the inadequacy of the host to establish or to maintain osseointegration.

The inability to establish osseointegration can be regarded as an  early failure.

The inability to maintain the achieved osseointegration, under functional conditions is considered a  late loss.

Clinically, lack of osseointegration leads to implant mobility and subsequent failure. Therefore, a mobile implant is a  failed implant. However, the process of failure is slow and gradual. Therefore, an implant that is progressively losing bone but is clinically stable (firm) can be defined as failing.