Evaluation of Locally Applied Ferulic Acid as Adjunct to Mechanical Debridement in Treatment of Periodontitis

Periodontitis is a complex chronic multifactorial inflammatory disease that impacts the tissues supporting teeth, causing their progressive destruction. It is initiated by bacterial infection, primarily involving Gram-negative anaerobic bacteria that trigger an immune response and production of pro-inflammatory cytokines. These cytokines recruit numerous neutrophils and macrophages to the site of infection resulting in the release of reactive oxygen species (ROS) and thus worsens tissue damage. Additionally, systemic diseases like diabetes mellitus or behaviors like smoking are examples of exacerbating factors .

Periodontitis remains a significant public health issue as it is the main cause of tooth loss and chewing dysfunction. This condition has far-reaching implications, affecting not only an individual's ability to maintain proper nutrition but also their quality of life and self-esteem. The impact of periodontitis extends beyond personal health, creating substantial socioeconomic burdens and escalating medical costs .

Therefore, effective treatment and management of periodontitis are crucial to mitigating these adverse effects and improving overall well-being. Tailored treatment approaches are essential, primarily focused on controlling the patient's infection. Supra- and subgingival instrumentation, commonly referred to as scaling and root planing (SRP), along with diligent home dental care, have an important role in managing the infection in patients diagnosed with periodontitis .

Systemic drugs used as adjuncts to SRP aim to enhance periodontal treatment outcomes by targeting bacterial pathogens or modulating the host immune response. Common systemic adjuncts include antibiotics, such as amoxicillin and metronidazole, which result in improvement in the clinical attachment levels (CAL) and reduction in periodontal probing depth (PPD) in chronic periodontitis patients. However, their prolonged use can lead to antibiotic resistance, gastrointestinal discomfort, and allergic reactions . Additionally, host-modulating agents, like sub-antimicrobial-dose doxycycline (SDD), inhibit matrix metalloproteinases (MMPs), reducing inflammation and tissue breakdown, but may cause photosensitivity or gastrointestinal issues with long-term use . Nonsteroidal anti-inflammatory drugs (NSAIDs) can also decrease bone resorption but are associated with gastrointestinal and cardiovascular side effects . While systemic drugs can augment SRP efficacy, their side effects and the potential for resistance necessitate careful patient selection and judicious use .

Optimizing the effectiveness of pharmacological therapy while minimizing risks and controlling the release of the drug is crucial. That's why a local drug delivery system (LDDS) is recommended in combination with SRP. LDDS shows promise in treating localized infections in various body parts and serves as a valuable tool for adjunctive local pharmacological therapy in periodontal treatment. LDDSs regulate the discharge of locally administered drugs meant to supplement periodontal treatment .

Ferulic acid, known as 4-hydroxy-3-methoxycinnamic acid, is a phenolic compound naturally found in various plants, including cereals, fruits, vegetables, and Chinese herbal medicines. It is known for its potent antioxidant properties, which help neutralize harmful free radicals and reduce oxidative stress. It also has numerous physiological properties, including anti-inflammatory, antioxidant, antibacterial, and anticancer, with low toxicity . In addition to being a free radical scavenger, ferulic acid also inhibits the enzymes that cause free radicals to form and increases the activity of scavenging enzymes . In addition, it is frequently used in skin care products as a brightening ingredient, photoprotective agent, and skin photoaging delayer .

Furthering, ferulic acid is one of the most important roles of phenolic acids, especially cinnamic acid derivatives, is their antioxidant activity, which depends primarily on the number of hydroxyl and methoxy groups attached to the phenyl ring. Ferulic acid is more easily absorbed into the body and stays in the blood longer than any other phenolic acids. Therefore, it is considered to be a superior antioxidant .

Hence, this study aimed to assess the validity of locally delivered ferulic acid nanoparticles as an adjunct to mechanical debridement for managing periodontitis.