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Bactericidal effect of the photocatalystic reaction of titanium dioxide using visible wavelengths on Streptococcus mutans biofilm

Authors
 Chan-Hee Kim  ;  Eun-Song Lee  ;  Si-Mook Kang  ;  Elbert de Josselin de Jong  ;  Baek-Il Kim 
Citation
 Photodiagnosis and Photodynamic Therapy, Vol.18 : 279-283, 2017 
Journal Title
 Photodiagnosis and Photodynamic Therapy 
ISSN
 1572-1000 
Issue Date
2017
MeSH
Anti-Bacterial Agents/administration & dosage ; Biofilms/drug effects* ; Biofilms/growth & development* ; Biofilms/radiation effects ; Catalysis/drug effects ; Catalysis/radiation effects ; Disinfection/methods* ; Dose-Response Relationship, Drug ; Dose-Response Relationship, Radiation ; Photochemotherapy/methods* ; Photosensitizing Agents/administration & dosage ; Streptococcus mutans/cytology ; Streptococcus mutans/drug effects* ; Streptococcus mutans/radiation effects* ; Titanium/administration & dosage* ; Treatment Outcome
Keywords
Biofilm ; Photocatalysis ; Photodynamic therapy ; Streptococcus mutans ; Titanium dioxide ; Ultraviolet light ; Visible light
Abstract
BACKGROUND: The aim of this study was to determine the effect of titanium dioxide (TiO2) photocatalysis induced by the application of clinically acceptable visible light at 405nm on the growth of Streptococcus mutans biofilms. METHODS: S. mutans biofilms were grown on a hydroxyapatite (HA) disk and deposited in a rutile-type TiO2 solution at a concentration of 0.1mg/mL. TiO2 photocatalysis was measured for exposure to visible light (405nm) and ultraviolet (UV) light (254nm) produced by light-emitting diodes for 10, 20, 30, and 40min. After two treatments, the number of colonies formed in the final S. mutans biofilm on the HA disk were measured to confirm their viability, and the morphological changes of S. mutans were evaluated using scanning electronic microscopy. RESULTS: The bactericidal effects of 254- and 405-nm light resulted in > 5-log and 4-log reductions, respectively (p<0.05), after 20min of treatment and a>7-log reduction after 40min of treatment in both treatment groups relative to the control group. CONCLUSION: It was confirmed that the antibacterial effect could be shown by causing the photocatalytic reaction of TiO2 in S. mutans biofilm even at the wavelength of visible light (405nm) as at the wavelength of ultraviolet light (254nm).
Full Text
https://www.sciencedirect.com/science/article/pii/S1572100016302022
DOI
10.1016/j.pdpdt.2017.03.015
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Preventive Dentistry and Public Oral Health (예방치과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Baek Il(김백일) ORCID logo https://orcid.org/0000-0001-8234-2327
Lee, Eun Song(이은송) ORCID logo https://orcid.org/0000-0002-2949-4783
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/160200
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