Effect of Low-Level Laser to Oral Microorganisms

저출력 레이저가 구강미생물에 미치는 영향

  • Yoon, In-Jong (Department of Oral Medicine, School of Dentistry, Kyung Hee University) ;
  • Auh, Q-Schick (Department of Oral Medicine, School of Dentistry, Kyung Hee University) ;
  • Chun, Yang-Hyun (Department of Oral Medicine, School of Dentistry, Kyung Hee University) ;
  • Hong, Jung-Pyo (Department of Oral Medicine, School of Dentistry, Kyung Hee University)
  • 윤인종 (경희대학교 치의학전문대학원 구강내과학교실) ;
  • 어규식 (경희대학교 치의학전문대학원 구강내과학교실) ;
  • 전양현 (경희대학교 치의학전문대학원 구강내과학교실) ;
  • 홍정표 (경희대학교 치의학전문대학원 구강내과학교실)
  • Received : 2009.12.17
  • Accepted : 2010.02.09
  • Published : 2010.03.30

Abstract

This study is to observe the bacteriocidal effect of the Low Level Laser (LLL) against oral microorganisms which are related to the occurrence of periodontal diseases and oral malodors. The Porphyromonas gingivalis 2561 (P. gingivalis 2561) and Prevotella intermedia (Pr. intermedia) were treated with photosensitizing substance-toluidine blue O (TBO; C.I. 52040) and then radiated with the LLL which has 650nm wavelength for 1, 2, 3 and 5mins. continuously upon varying distances of 1, 2 and 3cm for each experimental groups. The results are as follows; 1. The P. gingivalis 2561 which was treated with TBO and then radiated with LLL at a distance of 3cm for 1min. showed 99.99% higher antibacterial effect in comparison to the experimental group treated only with TBO. 2. The Pr. intermedia which was treated with TBO and then radiated with LLL at a distance of 3cm for 1min. showed 99.8% higher antibacterial effect in comparison to the experimental group treated only with TBO. 3. The bacteriocidal effect of the P. gingivalis 2561 treated with TBO was found to gradually increase as the radiation time of LLL extended from 1min. to 3min. at 1min. intervals. 4. A slight decrease in bacteriocidal effect of the P. gingivalis 2561 was found as the radiation distance of LLL increased from 1cm to 3cm at 1cm intervals. 5. The bacteriocidal effect of the Pr. intermedia was found to slightly decrease as the radiation distance of LLL increased from 1cm to 3cm at 1cm. intervals. As the results shown above suggest, the bacteriocidal effect of LLL was found to increase as the radiation time extended and the distance shortened. Moreover, even the experimental group radiated with LLL at 3cm distance for 1min. which showed the lowest level of bacteriocidal effect, was found to have 99.8% higher bacteriocidal effect than the experimental group which was treated only with TBO and, therefore, this clearly shows the bacteriocidal effect of LLL against oral microorganisms. Thus, the use of LLL is thought to become very useful for suportive treatment for periodontitis and implantitis, and controlling oral malodors as long as it is used within the limits where there is no side effect.

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