 
         
         Abstract
         
         Although implant therapy has been identified as a successful and predictable treatment
            for partially and completely edentulous patients, complications and failures can occur.
            There are two main categories of complications that occur in implant therapy: biological
            and technical (mechanical). Peri-implantitis is considered as a biological complication
            that results in bone loss around implants and may lead to implant treatment failure.
            Peri-implantitis has become a topic of major interest in contemporary dentistry due
            to its higher prevalence. Even though the main etiologic agent is bacterial biofilm,
            a myriad of factors influences the initiation and progression of peri-implant disease.
            The knowledge of the impact of peri-implantitis on the outcome of treatment with oral
            implants as well as the identification of risk factors associated with this inflammatory
            condition is essential for the development of supportive maintenance programs and
            the establishment of prevention protocols. Thus, this article reviews the recent evidence
            on the factors that may predispose implants to peri-implantitis.
         
         Keywords
dental implants - peri-implantitis - risk factors