Despite extensive research on periodontitis, little attention has been given to the symptoms and perception of peri-implant diseases and their impact on oral health-related quality of life. The study aims to assess patient perception of these diseases and their impact on quality of life through a cross-sectional observational study. Patients will be recruited from the Unit of Periodontics at "Le Scotte" University Hospital and will undergo diagnosis followed by questionnaire assessments. No follow-up visits are planned, and validated questionnaires will be administered to evaluate perception and impact on quality of life. Study procedures will include recording biometric peri-implant parameters and administering questionnaires such as the Brief Illness Perception Questionnaire (BIPQ) and Oral Health Impact Profile-14 (OHIP-14).

Peri-implant diseases are inflammatory processes, influenced by biofilm, affecting the soft and hard tissues surrounding dental implants. They encompass two main conditions: peri-implant mucositis and peri-implantitis. While professional biofilm removal, coupled with plaque control, is considered the gold standard treatment, its efficacy is limited. Therefore, enhancing prevention and early diagnosis strategies for peri-implant complications is crucial. Despite extensive research on patient perception of periodontitis symptoms, little attention has been given to the symptoms and perception of peri-implant diseases and their impact on oral health-related quality of life. This observational study aims to assess patient perception of peri-implant diseases and their impact on oral health-related quality of life (OHRQoL). The study is a cross-sectional observational study. Patients will be recruited from the Unit of Periodontics, Department of Medical Biotechnologies, at "Le Scotte" University Hospital. Following diagnosis of peri-implant disease, patients meeting inclusion and exclusion criteria specified in the protocol will be included. Given the study's cross-sectional nature, no follow-up visits are planned. Validated questionnaires regarding the perception and impact on the quality of life of peri-implant diseases will be administered. Study procedures will include recording biometric parameters extracted from a complete periodontal examination and administering questionnaires on the perception and impact on the quality of life of peri-implant diseases: Brief Illness Perception Questionnaire (BIPQ) and Oral Health Impact Profile-14 (OHIP-14).

Inclusion Criteria:

• Age between 18 and 70 years old;
• Presence of at least one dental implant;
• Presence of bleeding and/or suppuration upon probing of the peri-implant mucosa;
• Ability and willingness to provide written consent for participation in the study.

Exclusion Criteria:

• Pregnancy or breastfeeding status;
• Patients unable to communicate in Italian or English;
• Inability to perform proper oral hygiene maneuvers;
• Inability or unwillingness to provide written consent for participation in the study.

Patients will be recruited consecutively from those attending the Unit of Periodontics, Departoment of Medical Biotechnologies, at "Le Scotte" University Hospital (Siena, Italy).