Abstract
This narrative review focuses on the current understanding of the definition and prevalence of peri-implantitis. A MEDLINE (PubMed) search over the past 3 years was performed using keywords related to the definition and prevalence of peri-implantitis. Additional literature retrieved from reference lists, review articles, and consensus reports were used. Definition of peri-implantitis is heterogeneous due to the various thresholds of bone loss and pocket depths used, creating a discrepancy in the prevalence figures. The prevalence of peri-implant mucositis varied between 19 and 65 %, whereas the prevalence of peri-implantitis ranged from 10 to 40 %. A consensus has been reached that the definition of peri-implantitis should be clinical signs of inflammation (bleeding on probing) and/or suppuration, in combination with progressive bone loss. In addition, we strongly recommend that measurement of the bone loss in relation to the implant length would further classify the case as mild, moderate, or severe peri-implantitis.
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