Ozonized In-office and Domiciliary Gels vs Chlorhexidine Gel 1% for the Management of Peri-implant Mucositis Sites

This is a split-mouth randomized controlled clinical trial (RCT). After signing the informed consent, patients satisfying the inclusion criteria will undergo supragingival and subgingival professional oral hygiene of both arches performed with ultrasonic instrumentation with PEEK inserts, manual instrumentation with titanium curettes and air polishing with glycine powder. After that, the following treatment will be randomly assigned: * Ozoral Pro and Ozoral gel administration and home application for 2 peri-implant mucositis sites. * Curasept chlorhexidine gel 1% administration and domiciliary application for 14 days for 2 peri-implant contralateral sites. The study will last 6 months. Patients will be visited at: T0, after 1 month from T0 (T1), after 3 months (T2), after 6 months (T3). Professional hygiene will be performed again at T2 and T3. At each recall session, the following periodontal clinical indices were collected using a probe on each peri-implant site: BOP, GBI, conditions of the marginal mucosa (swelling and erythema), suppuration, migration of the marginal mucosa, PD, PI ,BS.