首页> 外文会议>Conference on Lasers in Dentistry Ⅷ, Jan 20-21, 2002, San Jose, USA >In vitro study of bactericidal effect of low level laser therapy in the presence of photosensitizer on cariogenic bacteria
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In vitro study of bactericidal effect of low level laser therapy in the presence of photosensitizer on cariogenic bacteria

机译:光敏剂存在下低水平激光疗法对龋齿细菌杀菌作用的体外研究

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The aim of this in vitro study was to determine whether low-level laser light in the presence of a photosensitizer could kill Streptococcus mutans and Streptococcus sobrinus. Suspensions of these microorganisms were exposed to a gallium-aluminium-arsenide laser light (660 nm) in the presence of photosensitizer toluidine blue O. Viable microorganisms were counted on brain heart agar plates after incubation at 37℃ in partial atmosphere of 10% CO_2 for 48 hours. Their exposure to the laser light in the absence of the dye or the dye in the absence of the laser light presented no significant effect on the viability of the microorganisms. However, a decrease in the number of viable microorganisms was only verified when they were exposed to both the laser light and the dye at the same time. Their total growth inhibition was achieved with a dye concentration of 100 pg/mL and a light energy density of 28.8 J/cm~2, after being exposed to laser light for 900 seconds. In conclusion, these results imply that these bacteria can be killed by low-power laser light in the presence of the photosensitizer.
机译:这项体外研究的目的是确定在光敏剂存在下的低强度激光能否杀死变形链球菌和sobrinus链球菌。在存在光敏剂甲苯胺蓝O的情况下,将这些微生物的悬浮液暴露于镓铝砷化物激光(660 nm)。在37%的10%CO_2部分气氛中孵育37℃后,在脑心琼脂平板上对存活的微生物进行计数。 48小时。它们在不存在染料的情况下暴露于激光或在不存在激光的情况下暴露于染料对微生物的生存力没有显着影响。但是,只有在同时暴露于激光和染料的情况下,才可以证实存活微生物数量的减少。暴露于激光900秒后,染料浓度为100 pg / mL,光能密度为28.8 J / cm〜2时,它们的总生长受到抑制。总之,这些结果表明,在存在光敏剂的情况下,这些细菌可被低功率激光杀死。

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