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Title: Air plasma effect on dental disinfection

A nonthermal low temperature air plasma jet is characterized and applied to study the plasma effects on oral pathogens and biofilms. Experiments were performed on samples of six defined microorganisms' cultures, including those of gram-positive bacteria and fungi, and on a cultivating biofilm sample of Streptococcus mutans UA159. The results show that the plasma jet creates a zone of microbial growth inhibition in each treated sample; the zone increases with the plasma treatment time and expands beyond the entire region directly exposed to the plasma jet. With 30s plasma treatment twice daily during 5 days of biofilm cultivation, its formation was inhibited. The viability of S. mutans cells in the treated biofilms dropped to below the measurable level and the killed bacterial cells concentrated to local regions as manifested by the fluorescence microscopy via the environmental scanning electron microscope. The emission spectroscopy of the jet indicates that its plasma effluent carries an abundance of reactive atomic oxygen, providing catalyst for the observed plasma effect.
Authors:
; ;  [1] ; ; ;  [2] ;  [3]
  1. Department of Basic Sciences and Craniofacial Biology, College of Dentistry, New York University, New York, New York 10010 (United States)
  2. Department of Electrical and Computer Engineering, Polytechnic Institute of New York University, Brooklyn, New York 11202 (United States)
  3. Department of Physics, Old Dominion University, Norfolk, Virginia 23529 (United States)
Publication Date:
OSTI Identifier:
22046906
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 18; Journal Issue: 7; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AIR; BIOLOGICAL EFFECTS; DENTISTRY; EMISSION SPECTROSCOPY; FLUORESCENCE; FUNGI; OXYGEN; PLASMA; PLASMA JETS; SCANNING ELECTRON MICROSCOPY; STERILIZATION; STREPTOCOCCUS