Jan, according to current evidence, how many implant patients and how many implants develop peri-implantitis?
Dr. Jan Derks: The numbers depend on the definition of peri-implantitis: With very tough case definitions, we see peri-implantitis in about 40-50 percent of implant patients...
Oh, wow…
Dr. Jan Derks: Yes, but this high prevalence results from a very low bone loss threshold of 0.5 mm which may be difficult to detect on a radiograph. Moderate to severe peri-implantitis with bone loss of more than 2 mm occurs in roughly 15 percent of patients and 8 percent of implants.1 These values have been confirmed in several cohorts from different countries.
The problem in peri-implantitis epidemiology is that there is no common classification – which is why different studies come to different numbers. The World Workshop on the Classification of Periodontal and Peri-Implant Diseases and Conditions, organized by the European Federation of Periodontology (EFP) and the American Academy of Periodontology (AAP), was a first step to solve this problem. How difficult is it to reach a commonly accepted consensus for this topic?
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