[Classification of periodontal and peri-implant tissues diseases (Euro-Perio, 2018). Advantages and inconveniences].

The article presents the «Classification of periodontal diseases and the state of perimplant tissues», adopted at the international Congress Euro-Perio-9 in 2018. The advantages and disadvantages of this systematics in comparison with the previous ones and with the classification currently adopted in the Russian Federation are noted.