Treatment of Streptococcus mutans bacteria by a plasma needle
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, 100080 Beijing (China)
- Department of Oral Biology, Peking University School and Hospital of Stomatology, 100080 Beijing (China)
- School of Science, Changchun University of Science and Technology, Changchun, Jilin 130022 (China)
A dielectric barrier discharge plasma needle was realized at atmospheric pressure with a funnel-shaped nozzle. The preliminary characteristics of the plasma plume and its applications in the inactivation of Streptococcus mutans (S. mutans), the most important microorganism causing dental caries, were presented in this paper. The temperature of the plasma plume does not reach higher than 315 K when the power is below 28 W. Oxygen was injected downstream in the plasma afterglow region through the powered steel tube. Its effect was studied via optical-emission spectroscopy, both in air and in agar. Results show that addition of 26 SCCM O{sub 2} does not affect the plume length significantly (SCCM denotes cubic centimeter per minute at STP). The inactivation of S. mutans is primarily attributed to ultraviolet light emission, O, OH, and He radicals.
- OSTI ID:
- 21190079
- Journal Information:
- Journal of Applied Physics, Vol. 105, Issue 6; Other Information: DOI: 10.1063/1.3080249; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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