**2. Definitions**

### **2.1 Peri-implant mucositis**

Peri-implant mucositis is defined as inflammation of the peri-implant mucosa around an osseointegrated implant without loss of the supporting bone. Clinical signs of peri-implant inflammation are bleeding and/or suppuration on probing, with or without increased probing depths [5, 6].

#### **2.2 Peri-implantitis**

Peri-implantitis is defined as a pathological condition characterized by inflammation in the peri-implant mucosa/connective tissue and progressive loss of the supporting bone around a dental implant. Clinical signs of peri-implantitis are bleeding and/or suppuration on probing, increasing probing depths, and/ or recession of the mucosal margin, in addition to radiographic bone loss compared to previous examinations. When a previous radiograph is not available, the following is indicative for the diagnosis of peri-implantitis: bone loss >3 mm in combination with bleeding on probing and pocket depth > 6 mm [5].
