Due to the remarkable success of dental implants, there is a growing interest in identifying factors associated with implant failure. A tangible number of implants do not integrate or do not survive for long term function. Complications and loss of implants can be costly, both in terms of time and financial resources. Loss of integration can be troublesome, resulting in an edentulous span more difficult to restore than prior to implant placement. Hence complications and failures should be avoided by careful attention to diagnosis, treatment planning, good surgical and prosthodontic training and experience and by following well established protocols that demonstrate high success and predictability. A better understanding of the factors associated with implant failure provide data for the planning of future studies, facilitate clinical decision making, and may enhance the implant success. This dissertation is indented to provide detailed review of the various failures and complications associated with the treatment of Osseo integrated end osseous implants.