The objective of Workgroup 4 was to present a classification on peri‐implant diseases and conditions. Five position papers describing the characteristics of peri‐implant health, peri‐implant mucositis, peri‐implantitis, soft and hard tissue deficiencies and case definitions and diagnostic considerations were prepared prior to the workshop.

In preparing this consensus report regarding the criteria for peri‐implant health and disease it was recognized that there are a number of somewhat unusual peri‐implant problems (e.g., implant fractures) and other conditions that may mimic or share certain clinical features with biofilm‐associated peri‐implant diseases. The following assumptions have been made: 1) complete medical‐dental histories have been obtained including details on implant‐supported reconstructions; and 2) an appropriate differential diagnostic analysis has been performed.

The following questions and case definitions are intended to apply to situations in which the clinician has reasons to believe that biofilms on implant surfaces are the main etiological exposures associated with the development of peri‐implant mucositis and peri‐implantitis. It is important to emphasize that there are major patient‐specific differences in inflammatory responses to the microbial challenge of bacterial communities that reside on implants. In addition, it has been assumed that the implants were properly placed and subsequently integrated with soft and hard tissues.