Mechanical Treatment Peri-Implant Mucositis

Inclusion Criteria: * Subject must be ≥ 20 years * Subject must have one implant presenting PIM as defined according to the World Workshop 2017 criteria (presence of BoP and/or suppuration (SoP), without bone loss exceeding 0.5 mm beyond crestal bone level changes resulting from initial remodeling, regardless of PPD. In absence of baseline radiographs (i.e., 0-1 year after loading) a bone level of \<2mm from the top of the intraosseous part of the implant is considered as the reference threshold) * Cleansable prosthesis (an interproximal brush must be able to pass from side to side at interproximal aspects tangential to the peri-implant sulcus, and a brush has to be able to reach the buccal and palatal/lingual sulcus). * No evidence of occlusal overload * No cement remnants identified on radiographs or clinically * Implant-supported fixed restoration inserted at least 6 months before patient enrolment and not interfering with assessment of clinical parameters at more than 3/6 sites * Periodontally healthy subjects or treated periodontitis (no residual site with PPD ≥ 5 mm) * Full-mouth plaque (FMPS) and bleeding (FMBS) score ≤ 20%¬¬¬¬¬¬¬ at screening visit * Non-smokers or light-smokers (\<10 cigarettes per day) * Competent to give consent Exclusion Criteria: * Previous radiotherapy, current use of chemotherapy, systemic long-term corticosteroid treatment * Hematologic disorders * Pregnant subjects * Patients classified as \> class 2 according to the ASA (American Society of Anesthesiologists) physical status classification * No systemic antibiotic treatment within 3 months prior to intervention