The Bactericidal Effects and Mechanisms of the He-Ne laser on Streptococcus mutans.

純一, 西方; 泰之, 平野; 公一, 伊藤; 治, 高田; 勝一, 成川; 正大, 村井

doi:10.2329/perio.34.410

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…We speculate that the mechanism responsible for this e#ect could be related to photochemical sensitisation [18]. Nishikata [19] used CV and trypan blue as photosensitisers and observed a marked bactericidal e#ect of He-Ne laser irradiation in the presence of CV, but not in the presence of trypan blue.…”

Section: Discussionmentioning

confidence: 95%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

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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Furumoto¹,

Ueda²,

Hosokawa³

et al. 2009

J Jpn. Soc. Laser Dent.

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This study proposes a method of measuring the dynamic force induced by laser irradiation on the human tooth. The dynamic load induced in a specimen by using elastic wave propagation in a long aluminum-alloy bar was measured. The laser-induced stress intensity was evaluated from the dynamic strain which was measured by semiconductor strain gauges attached to the long bar. In addition, the process of laser irradiation to the hard tissue surface was observed with an ultrahighspeed video camera. Carbon powder and titanium dioxide powder were applied to the dentin surface so as to effectively absorb the laser beam. The results showed that the hard tissue surface was flashed during the laser irradiation, and the melted tissues continued to scatter in the direction perpendicular to the tissue surface in a mushroom-like wave. The measured dynamic stress induced on the surface increased with the increase of laser energy and was closely related to the prepared cavity on the surface. The titanium dioxide powder more effectively induced stress than the carbon powder. The induced dynamic stress for eliminating a unit volume of hard tissue was 0.03 Pa/mm 3 .

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数洋¹,

光男²,

章雄³

et al. 2011

J Jpn. Soc. Laser Dent.

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Background and Objective : In recent years, there has been growing interest in the use of dental lasers for treatment of periodontal diseases. The purpose of this clinical trial was to evaluate the effects of antimicrobial photodynamic therapy (aPDT) with indocyanine green (ICG) loaded nanospheres as photosensitizer for periodontal treatment. Material and Methods : Seventeen patients (56.1±10.3 years of age) participated in this study. Intended sites were taken from periodontally involved sites with a probing depth of ≥ 5 mm totaling 51 sites. These sites were divided into three groups at random. The laser with nanospheres group consisted of 17 sites irradiated with a diode laser at 0.5 W for 90 sec per site after injecting nanospheres into the periodontal pocket. The optical fiber was inserted into the periodontal pocket 1 mm less than the probing depth with surface anesthesia and moved up and down in order to irradiate the root surface as evenly as possible. The laser group consisted of 17 sites that were irradiated with the diode laser at 0.5 W for 90 sec per site. The sham group consisted of 17 sites that were not irradiated, but the fiber was only inserted into the periodontal pockets and moved up and down. Each subject was monitored clinically at baseline, 1 month, and 3 months. Clinical parameters such as probing pocket depth (PPD) , clinical attainment level (CAL) , and bleeding on probing (BOP) were measured at each site with a stent. Results : The mean value of the PPD significantly decreased in the laser with nanospheres group from 5.23±0.75 to 3.71±

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The Bactericidal Effects and Mechanisms of the He-Ne laser on Streptococcus mutans.

Cited by 4 publications

References 9 publications

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

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

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