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The bactericidal activity of pulsed Nd-YAG laser radiation in vitro |
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| Authors: | Dr C. J. Whitters T. W. Macfarlane D. Mackenzie H. Moseley R. Strang |
| Affiliation: | (1) Department of Clinical Physics and Bio-Engineering, University of Glasgow Dental School, 378 Sauchiehall Street, G2 3JZ Glasgow, UK;(2) Department of Oral Sciences, University of Glasgow Dental School, 378 Sauchiehall Street, G2 3JZ Glasgow, UK;(3) Department of Clinical Physics and Bio-Engineering, West of Scotland Health Boards, 22 Western Court, 100 University Place, G12 8SQ Glasgow, UK;(4) Department of Clinical Physics and Bio-Engineering, West of Scotland Health Boards, 378 Sauchiehall Street, G2 3JZ Glasgow, UK |
| Abstract: | Pulsed Nd-YAG laser irradiation of bacteria has been suggested as a possible means of treating contaminated intra-oral sites although relatively few studies have been conducted. In this investigation, the antimicrobial activity of a pulsed Nd-YAG laser was assessed in vitro for a range of oral bacteria using several pulse energies and exposure durations. Pure cultures of each organism were lased in saline suspensions followed by standard colony counting techniques for test and control samples. Microbial inhibition was found to be organism-dependent and varied with energy dose and pulse energy. For all nine test species 120-mJ laser pulses proved more efficient than 80-mJ pulses, with 99.9% kills compared with around 90% kills after exposure to 1800 pulses. These killing activity levels compare favourably with those achieved with other lasers in vitro. |
| Keywords: | Bacteria radiation effects Oral bacteria Dental plaque Bacterial inhibition Nd-YAG laser Laser radiation |
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