Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)

Korean Academy of Pediatric Dentistry (대한소아치과학회)
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THE EFFECT OF PHOTODYNAMIC THERAPY ON THE VIABILITY OF STREPTOCOCCUS MUTANS ISOLATED FROM ORAL CAVITY

광역동 치료가 구강 내에서 분리한 수종의 Streptococcus mutans의 생존력에 미치는 영향

  • Jung, Ji-Sook (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University) ;
  • Park, Ho-Won (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University) ;
  • Lee, Ju-Hyun (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University) ;
  • Seo, Hyun-Woo (Department of Pediatric Dentistry, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University) ;
  • Lee, Si-Young (Department of Microbiology and Immunology, Oral Science Research Center, College of Dentistry, Gangneung-Wonju National University)
  • 정지숙 (강릉원주대학교 치과대학 소아치과학교실) ;
  • 박호원 (강릉원주대학교 치과대학 소아치과학교실) ;
  • 이주현 (강릉원주대학교 치과대학 소아치과학교실) ;
  • 서현우 (강릉원주대학교 치과대학 소아치과학교실) ;
  • 이시영 (강릉원주대학교 치과대학 미생물학 및 면역학 교실 및 구강과학연구소)
  • Received : 2012.02.07
  • Accepted : 2012.07.31
  • Published : 2012.08.31
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Abstract

Photodynamic therapy (PDT) is a technique that involves the activation of photosensitizer by light in the presence of tissue oxygen, resulting in the production of reactive radicals capable of inducing cell death. The aim of this study was to evaluate the effect of PDT on Streptococcus mutans in planktonic conditions, previously treated with different photosensitive concentrations of erythrosine, using halogen and LED curing unit as a light source. And we compared the effects of PDT on six strains of S. mutans isolated from oral cavity and reference strain. As a result, S. mutans was susceptible to the combination of hand held photopolymerizer (HHP) and erythrosine. The higher concentration of erythrosine in the presence of light irradiation induced greater effects in reduction of viability of S. mutans. Isolated S. mutans showed a significant reduction in bacterial counts of the groups submitted to PDT compared to the control groups. And they appeared to be similar or slightly lower antimicrobial effect compared with reference strain. However, the difference was not significant (p < 0.05). In conclusion, PDT using erythrosine as a photosensitizing agent and HHP as a light source could be an efficient option for diseases caused by S. mutans.

광역동 치료는 광감각제가 빛에 의해 활성화되면서 발생하는 화학 반응을 이용한 것으로, 치료 원리는 광화학 반응으로 자유 라디칼 및 반응성 산소가 생성되고 이 산물들에 의한 세포 독성으로 항균 효과를 가지게 되는 것이다. 이 연구의 목적은 치과 임상에서 널리 사용되는 광원(할로겐, LED)과 광감각제(erythrosine)를 이용하여, 치아 우식증과 연관된 세균인 Streptococcus mutans에 대한 광역동 치료의 항균 효과를 알아보고, 광감각제의 농도에 따른 광역동 치료의 효과를 평가하기 위함이다. 또한 임상 분리 균주와 표준 균주에 대한 광역동 치료의 효과를 비교해 보았다. 연구 결과, 표준 및 임상 분리 균주 모두 광감각제 처리 후 광조사를 시행한 군에서만 대조군에 비해 S. mutans의 유의한 감소가 나타났다. 또한 광조사를 시행한 군에서 첨가한 광감각제의 농도가 높을수록 S. mutans의 감소가 증가하는 것으로 나타났다. 표준 균주와 비교 시 임상 분리 균주에서는 표준 균주와 비슷하거나 약간 낮은 S. mutans의 감소가 나타났고, 이는 통계적으로 유의한 차이는 없었다(p < 0.05). 이상의 결과들로 보아 광감각제로 에리스로신의 사용과 광원으로 치과용 광중합기를 사용한 광역동 치료는 S. mutans 연관 질병에 대한 효과적인 치료 방법이 될 수 있을 것으로 사료된다.

Keywords

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