Non Surgical Peri-implant Mucositis Treatment in Patients With Tissue-level and Bone-level Implants

Inclusion criteria: * Male and female aged \> 18 years * TL and BL titanium implants with smooth necks supporting cemented or screw-retained single-unit crowns diagnosed with PM (Berglundh, et al.,2018) * Implants placed in both arches * Patients with gingivitis or treated periodontitis (i.e., absence of residual PD \> 5 mm) * Presence of at least 2 mm of keratinized mucosa at implant sites. Exclusion criteria: * presence of medical conditions contraindicating treatment of peri-implant mucositis, * regular use of anti-inflammatory drugs or antibiotics within 3 months prior to study enrollment * Presence of systemic diseases * Pregnant and lactating females * Smokers \> 10 cigarettes/day * Use of inflammatory drugs or antibiotics within 3 months prior to study recruitment * Implants with modified (i.e. micro-rough) necks * Interproximal open contacts between implant restoration and adjacent teeth * Peri-implantitis (Renvert, et al., 2018)