Daily Administered Dual-Light Photodynamic Therapy Provides a Sustained Antibacterial Effect on Staphylococcus aureus

Antibiotics as adjunct to non-surgical periodontal therapy in diabetic patients

DATA SOURCES

A comprehensive literature search was performed via MEDLINE/PubMed, Scopus, and Web of Science, including all relevant publications accessed on March 2023 and subsequently updated up to July 2024. Additionally, grey literature was searched, and there was no restriction on publication data and languages.

STUDY SELECTION

All randomized clinical trials comparing topical/systemic antibiotics as an adjunct to scaling and root planning (SRP) with SRP alone for the treatment of diabetic patients with periodontitis were included. Literature reviews, case reports and series, preclinical studies or studies lacking periodontal data were excluded. Clinical attachment level was considered as the primary outcome. Bleeding on probing, pocket depth, and gingival index were the secondary outcomes.

DATA EXTRACTION AND SYNTHESIS

The risk of bias was evaluated using the Cochrane Collaboration Tool, and for each domain, bias risk was judged as low, unclear and high risk of bias. Selection, removing duplicates, screening, extracting data, and assessing the quality of studies were done by two investigators and findings were tabulated. Meta-analysis was conducted, generating forest plots to compare different treatment modalities, time periods, and antibiotic types. Key periodontal parameters such as probing pocket depth (PPD), clinical attachment level (CAL), plaque index (PI), and bleeding on probing (BoP) were analysed.

RESULTS

Upon screening and further evaluation of 690 articles, 43 were considered for full-text eligibility. Finally, 30 studies were included in the systematic review, and 27 were included in meta-analysis. Out of 30 randomized clinical trials, 9 studies focused on topical and antibiotics, and 21 involved systemic administration of antibiotics. Five of the nine studies focussing on topical administration of antibiotics, were classified as having a low risk of bias and four as having a high risk of bias. Out of 21 studies on systemic antibiotics, eight were classified as having a low risk of bias, two were undefined, and eleven showed a high risk of bias. Authors concluded that adjunctive use of antibiotics could lead to improvement in periodontal clinical parameters CONCLUSION: The findings showed that the adjunctive use of antibiotics led to slight improvements in clinical outcomes. However, keeping in mind antibiotic resistance, and side effects of antibiotics, their use should be approached cautiously and only when necessary.

A modular phage vector platform for targeted photodynamic therapy of Gram-negative bacterial pathogens

Growing antibiotic resistance has encouraged the revival of phage-inspired antimicrobial approaches. On the other hand, photodynamic therapy (PDT) is considered a very promising research domain for the protection against infectious diseases. Yet, very few efforts have been made to combine the advantages of both approaches in a modular, retargetable platform. Here, we foster the M13 bacteriophage as a multifunctional scaffold, enabling the selective photodynamic killing of bacteria. We took advantage of the well-defined molecular biology of M13 to functionalize its capsid with hundreds of photo-activable Rose Bengal sensitizers and contemporarily target this light-triggerable nanobot to specific bacterial species by phage display of peptide targeting moieties fused to the minor coat protein pIII of the phage. Upon light irradiation of the specimen, the targeted killing of diverse Gram(-) pathogens occurred at subnanomolar concentrations of the phage vector. Our findings contribute to the development of antimicrobials based on targeted and triggerable phage-based nanobiotherapeutics.

Home-Applied Dual-Light Photodynamic Therapy in the Treatment of Stable Chronic Periodontitis (HOPE-CP)-Three-Month Interim Results

A single-site, randomized clinical trial was designed to determine the efficacy of regular home use of Lumoral® dual-light antibacterial aPDT in periodontitis patients. For the study, 200 patients were randomized to receive non-surgical periodontal treatment (NSPT), including standardized hygiene instructions and electric toothbrush, scaling and root planing, or NSPT with adjunctive Lumoral® treatment. A complete clinical intraoral examination was conducted in the beginning, at three months, and at six months. This report presents the three-month results of the first 59 consecutive randomized subjects. At three months, bleeding on probing (BOP) was lower in the NSPT + Lumoral®-group than in the NSPT group (p = 0.045), and more patients in the NSPT + Lumoral®-group had their BOP below 10% (54% vs. 22%, respectively, p = 0.008). In addition, patients in the NSPT + Lumoral®-group improved their oral hygiene by visible-plaque-index (p = 0.0003), while the NSPT group showed no statistical improvement compared to the baseline. Both groups significantly reduced the number of deep periodontal pockets, but more patients with a reduction in their deep pocket number were found in the NSPT + Lumoral® group (92% vs. 63%, p = 0.02). Patients whose number of deep pockets was reduced by 50% or more were also more frequent in the NSPT + Lumoral®-group (71% vs. 33%, p = 0.01). Patients with initially less than ten deep pockets had fewer deep pockets at the three-month follow-up in the Lumoral® group (p = 0.01). In conclusion, adjunctive use of Lumoral® in NSPT results in improved treatment outcomes at three months post-therapy.

Repeated Daily Use of Dual-Light Antibacterial Photodynamic Therapy in Periodontal Disease—A Case Report

Good oral hygiene at home is the foundation for optimal treatment response and long-term periodontal disease control. Antibacterial photodynamic therapy (aPDT) provides a very potent adjunctive treatment for plaque control. However, the literature regarding repeated aPDT use is sparse. aPDT has been a modality applied mainly in the dental office environment, and when applied once a year or every few months, the results have been usually disappointing. Recently, LED development has brought aPDT for repeated and practical use at home. We present the very positive results and clinical outcome of daily applied dual-light aPDT-technology treatment in conjunction with mechanical cleaning of a 78-year-old male patient with severe periodontal disease (Stage IV and Grade B).

Repeated Home-Applied Dual-Light Antibacterial Photodynamic Therapy Can Reduce Plaque Burden, Inflammation, and aMMP-8 in Peri-Implant Disease—A Pilot Study

Until now, in clinical dentistry, antibacterial photodynamic therapy (aPDT) has been restricted to in-office treatments, which hampers repeated applications. This pilot study tested the benefit of a commercially available Lumoral^® device designed for regular periodontal dual-light aPDT treatment at home. Seven patients with peri-implant disease applied dual-light aPDT daily in addition to their normal dental hygiene for four weeks. A single Lumoral^® treatment includes an indocyanine green mouth rinse followed by 40 J/cm² radiant exposure to a combination of 810 nm and 405 nm light. A point-of-care analysis of active-matrix metalloproteinase (aMMP-8), visible plaque index (VPI), bleeding on probing (BOP), and peri-implant pocket depth (PPD) measurements was performed on day 0, day 15, and day 30. Reductions in aMMP-8 (p = 0.047), VPI (p = 0.03), and BOP (p = 0.03) were observed, and PPD was measured as being 1 mm lower in the implant (p = ns). These results suggest a benefit of regular application of dual-light aPDT in peri-implantitis. Frequently repeated application can be a promising approach to diminishing the microbial burden and to lowering the tissue destructive proteolytic and inflammatory load around dental implants. Further studies in larger populations are warranted to show the long-term benefits.