[Alert to the overlooked important oral disease: peri-implant diseases].

Peri-implant diseases are inflammatory diseases in the spectrum of oral diseases, which are caused by the dysbiosis of peri-implant flora and the imbalance between microorganism and host. Peri-implant diseases are divided into two types: peri-implant mucositis and peri-implantitis. The diagnostic definition of peri-implant mucositis is based on presence of peri-implant signs of inflammation (redness, swelling, line or drop of bleeding/suppuration following probing) and no additional bone loss following initial healing. The clinical definition of peri-implantitis is based on not only the presence of peri-implant signs of inflammation but also radiographic evidence of bone loss following initial healing. Peri-implant diseases, like periodontitis, have clear etiology, histopathological features, clinical manifestations, and current international consensus diagnostic criteria. This article provides an overview of the etiology, histopathological features, key points of examination and diagnosis, prevention and non-surgical treatment, and surgical treatment of peri-implant diseases. The aim is to raise the awareness of dentists, especially those who specialize in oral implantology and restoration, to have a concept of periodontal and implant health, master the basic theoretical knowledge and prevention and treatment methods of peri-implant diseases, and also inform patients to control plaque and maintain their oral health.