| Title | Effects of Rose Bengal- and Methylene Blue-Mediated Potassium Iodide-Potentiated Photodynamic Therapy onEnterococcus faecalis: A Comparative Study |
| Authors | Li, Ruijie Yuan, Lintian Jia, Weiqian Qin, Man Wang, Yuguang |
| Affiliation | Peking Univ, Sch & Hosp Stomatol, Dept Pediat Dent, Beijing, Peoples R China Peking Univ, Sch & Hosp Stomatol, Natl Engn Lab Digital & Mat Technol Stomatol, Beijing, Peoples R China Peking Univ, Sch & Hosp Stomatol, Ctr Digital Dent, Beijing, Peoples R China |
| Keywords | ENTEROCOCCUS-FAECALIS ANTIMICROBIAL ACTIVITY SODIUM-HYPOCHLORITE APICAL PAPILLA PRIMARY TEETH PULP DISINFECTION PHOTOSENSITIZERS INSTRUMENTATION CHLORHEXIDINE |
| Issue Date | Jul-2020 |
| Publisher | LASERS IN SURGERY AND MEDICINE |
| Abstract | Background and Objectives This study was performed to compare the use of methylene blue (MB) and rose bengal (RB) in antimicrobial photodynamic therapy (PDT) targetingEnterococcus faecalis(E. faecalis) bacteria in planktonic and biofilm forms with potassium iodide (KI) potentiation. Study Design/Materials and Methods E. faecalisbacteria in planktonic form were exposed to antimicrobial PDT protocols activating MB and RB, with or without KI potentiation, following laser irradiation with different exposure times, 60 mW/cm(2)laser power, and different photosensitizer agent (PS)/potentiator concentrations to observe relationships among the variables. Two continuous-wave diode lasers were used for irradiation (red light:lambda = 660 nm and green light:lambda = 565 nm). The pre-irradiation time was 10 minutes. The vitality ofE. faecalisbiofilm was assessed by confocal laser scanning microscopy, and the morphology was determined by scanning electron microscopy. The effects on the proliferation of stem cells from the apical papilla (SCAPs) were analyzed by cell counting kit-8 assay. The staining effect of antimicrobial PDT on dentin slices was investigated. Statistical analysis using a one-way analysis of variance was done. Results KI-potentiated RB and MB antimicrobial PDT both effectively eradicatedE. faecalisbacteria in planktonic and biofilm forms. The minimum bactericidal concentrations of PSs (+/- 100 mM KI) were obtained through PDT on planktonicE. faecalis, and the optimal light parameters were 60 mW/cm(2), 6 J/cm(2)for 100 seconds. KI-potentiated PDT effectively strengthened the ability to inhibitE. faecalisbiofilm with 86.50 +/- 5.78% for MB (P = 0.0015 < 0.01) and 91.50 +/- 1.75% for RB (P = 0.0418 < 0.05) of bactericidal rate, with less toxicity for SCAPs (P < 0.001) and less staining. KI could reduce the staining induced by antimicrobial PDT on dentin slices. Conclusion A combination of KI and antimicrobial PDT may be a useful alternative to conventional disinfection methods in endodontic treatment. MB and RB antimicrobial PDT at much lower concentrations with KI could hopefully achieve disinfection effects comparable with those of 1.5% NaClO while causing few adverse effects on SCAPs. KI helps to avoid staining problems associated with high concentrations of photosensitizer agents. Lasers Surg. Med. (c) 2020 Wiley Periodicals, LLC |
| URI | http://hdl.handle.net/20.500.11897/617292 |
| ISSN | 0196-8092 |
| DOI | 10.1002/lsm.23299 |
| Indexed | SCI(E) |
| Appears in Collections: | 口腔医院 |
