Ozone Therapy With Biomimetic Oral Care for Cancer-Related Oral Mucositis (OZOMUC)

University of Pavia

Status: Enrolling

Conditions: Chemotherapy-induced Oral Mucositis; Oral Mucositis; Head and Neck Neoplasms

Treatments: Device: Gas Ozone Therapy; Other: Biomimetic Oral Care Regimen

Study type: Interventional

Funder types: Other

Identifiers

NCT07491536

2026-OZONEOM

Details and patient eligibility

About

Oral mucositis is a frequent and often debilitating complication of radiotherapy and chemotherapy, particularly in patients treated for head and neck cancers. It is characterized by inflammation and ulceration of the oral mucosa, leading to pain, difficulty swallowing, taste disturbances, dry mouth, and impairment of daily activities. In more severe cases, oral mucositis may require modification or temporary interruption of cancer treatment.

This randomized controlled clinical trial is designed to assess the clinical effectiveness of gas ozone therapy in patients with radio- and chemotherapy-induced oral mucositis. In addition, the study will evaluate whether combining ozone therapy with a structured biomimetic oral care regimen, including toothpaste and mouthwash, provides additional clinical benefit compared with ozone therapy alone.

Eligible participants will be randomly assigned to one of two parallel groups. The control group will receive gas ozone therapy administered in an outpatient setting according to a standardized protocol. The experimental group will receive the same ozone therapy combined with a defined home oral care regimen. Each participant will be followed for 30 days.

The primary outcome is the change in oral mucositis severity, assessed using the World Health Organization Oral Toxicity Scale. Secondary outcomes include oral pain intensity, salivary flow rates, perceived dry mouth, taste alterations, swallowing function, oral pH, overall oral health-related quality of life, and treatment tolerability.

The findings of this study are expected to clarify the role of ozone-based supportive care strategies in the management of cancer therapy-related oral mucositis and to contribute to the development of standardized non-pharmacological treatment protocols.

Full description

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.

Enrollment: 50 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

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

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

---

50 participants in 2 patient groups

Gas Ozone Therapy

Active Comparator group

Description:

Participants assigned to this arm will receive gas ozone therapy administered in an outpatient clinical setting using a certified medical device. The oral mucosa will be gently dried prior to treatment, and ozone will be applied locally to affected areas using a dedicated silicone applicator. Each site will receive 60 seconds of exposure per cm² at predefined device settings, with a maximum of four sites treated per session. Treatment will be performed three times weekly during the first two weeks (days 1, 3, and 5), followed by twice-weekly sessions until day 30. All participants will receive standardized oral hygiene instructions and will use the same biomimetic toothpaste throughout the study period.

Treatment:

Device: Gas Ozone Therapy

Gas Ozone Therapy Plus Biomimetic Oral Care

Experimental group

Description:

Participants assigned to this arm will receive the same standardized gas ozone therapy protocol described for the control group. In addition, they will use a biomimetic mouthwash twice daily (morning and evening) after routine oral hygiene procedures for 30 consecutive days. All participants will receive standardized oral hygiene instructions and will use the same biomimetic toothpaste during the study period. Adherence to the domiciliary mouthwash regimen will be monitored through a structured patient diary.

Treatment:

Other: Biomimetic Oral Care Regimen