Ozone Therapy With Biomimetic Oral Care for Cancer-Related Oral Mucositis

Oral mucositis represents a clinically relevant toxicity associated with radiotherapy and chemotherapy, particularly in patients undergoing treatment for head and neck malignancies. The condition arises from a multifactorial biological process that includes epithelial injury, inflammatory cascade activation, oxidative stress imbalance, and subsequent disruption of mucosal integrity. The resulting ulcerative lesions are frequently associated with pain, impaired oral intake, dysphagia, taste alterations, and deterioration in oral health-related quality of life. In more severe cases, mucositis may interfere with adherence to oncologic treatment schedules.

Although several supportive approaches have been proposed, there is currently no universally accepted non-pharmacological protocol capable of consistently reducing mucositis severity and improving functional outcomes.

Medical ozone has been investigated in dentistry for its antimicrobial, anti-inflammatory, and tissue-regenerative properties. Experimental evidence suggests that controlled topical ozone exposure may enhance local oxygen metabolism, modulate inflammatory mediators, and promote mucosal repair. However, robust randomized clinical data evaluating standardized gas ozone protocols in patients with cancer therapy-induced oral mucositis remain limited.

The present study is a monocentric, randomized, controlled, parallel-group clinical trial designed to assess the clinical effectiveness of gas ozone therapy administered using a certified medical device. The trial also aims to investigate whether the association of ozone therapy with a structured biomimetic oral care regimen provides additional benefit compared with ozone therapy alone.

Eligible participants diagnosed with grade 1-3 oral mucositis will be randomized in a 1:1 ratio to receive either ozone therapy alone or ozone therapy combined with a defined home oral care protocol. Ozone applications will be performed in an outpatient clinical setting according to standardized parameters over a 30-day period. Participants allocated to the combined treatment arm will follow a structured domiciliary oral hygiene regimen throughout the study duration.

Clinical evaluations and patient-reported outcome measures will be collected at predefined follow-up visits to monitor mucosal status, symptom progression, functional changes, and treatment tolerability. The study is designed to generate clinically applicable data regarding the role of ozone-based supportive care strategies in the management of radio- and chemotherapy-induced oral mucositis.

Inclusion criteria

• Age ≥ 18 years
• Confirmed diagnosis of radio- and/or chemotherapy-induced oral mucositis, grade 1-3 according to the WHO Oral Toxicity Scale
• Undergoing oncologic treatment for solid malignancies, particularly head and neck cancers
• Clinically stable general health condition (ASA physical status I-III)
• Ability to understand and comply with study procedures, including domiciliary treatment and questionnaire completion
• Written informed consent provided

Exclusion criteria

• Oral mucositis grade 4 according to the WHO Oral Toxicity Scale
• Active fungal or bacterial oral infections (e.g., candidiasis, ulcerative stomatitis)
• Traumatic ulcers, non-oncologic mucositis, or concomitant oral mucosal diseases (e.g., lichen planus, pemphigus, graft-versus-host disease)
• Ongoing head and neck radiotherapy with cumulative dose >70 Gy or completion within 7 days prior to enrollment
• Use within 14 days prior to enrollment of mouthwashes, sprays, or gels containing hyaluronic acid, ozone, aloe vera, or similar bioactive agents
• Systemic or topical therapies known to interfere with salivary function or mucosal healing (e.g., anticholinergics, tricyclic antidepressants, diuretics)
• Known allergy or hypersensitivity to components of the oral care products or materials used during ozone therapy
• Severe or uncontrolled systemic diseases (including hepatic, renal, respiratory, or cardiac insufficiency)
• Severe immunosuppression or neutropenia (neutrophils <1,000/mm³)
• Pregnancy or breastfeeding
• Alcohol or substance abuse, or any condition that may compromise adherence to the protocol
• Inability to attend scheduled follow-up visits through Day 30