Enhancement of Erythrosine Photodynamic Therapy against Streptococcus mutans by Chlorhexidine

Streptococcus mutans에 대한 클로르헥시딘과 Erythrosine 광역동 치료의 상승효과

  • Park, Jongcheol (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University) ;
  • Park, Howon (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University) ;
  • Lee, Siyoung (Department of Microbiology and Immunology, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University)
  • 박종철 (강릉원주대학교 치과대학 소아치과학교실) ;
  • 박호원 (강릉원주대학교 치과대학 소아치과학교실) ;
  • 이시영 (강릉원주대학교 치과대학 미생물학 및 면역학교실 및 구강과학연구소)
  • Received : 2013.04.12
  • Accepted : 2013.09.07
  • Published : 2013.11.29


The purpose of this study was to investigate the synergistic effects of erythrosine sensitized with a conventional halogen curing unit and sub-minimal bactericidal concentration(sub-MBC) of chorhexidine on bacterial viability of Streptococcus mutans in planktonic state. Sub-minimal bactericidal concentration of chlorhexidine was added into wells containing bacteria and erythrosine. The range of concentrations tested for chorhexidine was from 0.0000001% to 0.001%. The irradiation of the bacterial suspensions was performed for 15 sec with a conventional halogen curing unit light. In another set of experiment, the effects of 0.001% chlorhexidine were observed by adding chlorhexidine into wells containing the sub-minimal bactericidal concentration of erythrosine. At the concetration of 0.001% chlorhexidine, there were no antibacterial effects in the absence of erythrosine PDT(p < 0.05). At the concentraton of $1{\mu}M$ erythrosine, there was no photodynamic therapy effect in the absence of chlorhexidine(p < 0.05). But in the presence of sub-minimal bactericidal concentration of erythrosine with light exposure, the addition of 0.001% chlorhexidine increased the bactericidal rate(p < 0.05). A combination of erythrosine PDT with sub-MBC chlorhexidine resulted in a significant reduction in bacterial counts when compared to the case with the absence of chlorhexidine.


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