Mechanism of Bactericidal Effect of He-Ne laser Irradiation on Streptococcus mutans (PS14).

泰之, 平野; 純一, 西方; 登, 汐見; 修, 岸田; 純, 小幡; 公一, 伊藤

doi:10.2329/perio.35.157

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“…Several studies showed that, low-power laser irradiation in combination with a photosensitiser had a bactericidal e#ect [15][16][17]. Our previous studies demonstrated that Yellow He-Ne laser irradiation in the presence of crystal violet (CV: actioned as a photosensitiser) had bactericidal e#ects on oral bacteria in vitro [18][19][20][21] and in rats [22]. However, the e#ects of this laser system on oral bacteria in the human mouth are not known.…”

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confidence: 99%

Inhibitory Effect of Yellow He-Ne Laser Irradiation Mediated by Crystal Violet Solution on Early Plaque Formation in Human Mouth

et al. 2000

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The purpose of this study was to evaluate the e#ect of yellow He-Ne laser irradiation in the presence of crystal violet (CV) solution on dental plaque formation in the human mouth. Four enamel specimens were fixed on a retainer, one of which was placed on both maxillary buccal sites of four subjects. The retainers were assigned randomly to 3-or 7-day experimental periods and the right or left buccal sites for the evaluation of plaque formation on the specimens. Then, the specimens were assigned randomly to four treatments as follows: A, laser irradiation; B, CV application; C, CV application and laser irradiation and D, no treatment (control). At three and seven days after the treatments, the inhibitory e#ects of plaque formation on the specimens were evaluated by measuring the thickness of the plaque on each section. Analysis of the plaque formation scores revealed that treatment C had a significantly greater inhibitory e#ect on plaque formation than treatment A, B and D after 3 days, however there were no significant di#erences among the plaque formation scores of the four treatment groups after 7 days. Analysis of the plaque thickness revealed that at both 3 and 7 days after treatment, the plaque layers after treatment C were significantly thinner than those after treatments A, B and D. These results indicated that yellow He-Ne laser irradiation in the presence of CV had an inhibitory e#ect of plaque formation in human mouth.

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