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<正>In this presentation I shall focus on the new concepts of the aetiology and pathogenesis of peri-implant diseases leading to the definition and dassificafion of Peri-implant mucositis and Periimplantitis,according to the consensus of the recent World Workshop 2018.We shall present the diagnostic tools and criteria for defining a peri-implant mucositis and a peri-implantitis case.We shall present the non-surgical and surgical