Peri-implantitis Treatment With Chitosan Brush

Inclusion Criteria: * Presence of peri-implantitis in an implant that has been in function for more than 12 months * Age ≥ 18 and \< 65 * Agreeing to participate in the study after reading the informed consent form * Completion of periodontal treatment of patients diagnosed with periodontitis before inclusion in the study Exclusion Criteria: * Patients under 18 years of age * Patients who have received or are currently receiving radiotherapy, chemotherapy and long-term systemic corticosteroid treatment * Patients who received systemic antibiotics within 6 months from baseline * Pregnant or lactating patients * Patients with anatomical abnormalities around the implant (e.g., apically positioned implants adjacent to a tooth) * Patients with prostheses that prevent access for implant debridement with chitosan brushes or titanium curettes * Implants with an overdenture superstructure * Implants to be explanted * Patients with ASA score ≥ 3 * Patients reporting reactions or adverse events to chitosan, stainless steel, adhesives, or polypropylene * Clinically mobile implants * Recently placed and non-osseointegrated implants * Around major nerves and blood vessels, if there is a risk of structural damage