title: [Evaluation of two different cold plasma treatments on root canal infected with enterococcus faecalis biofilms].
abstract: OBJECTIVE
  To compare the bactericidal efficacy of two different cold plasma (glow discharge and dielectric barrier discharge) treatments on root canal infected with Enterococcus faecalis biofilms in vitro.
  
  
  METHODS
  One hundred and twenty teeth infected with Enterococcus faecalis biofilm in the roots for seven days were divided into twelve groups randomly. Two served as negative control group (gas only, no discharge). Five were teeth treated by dielectric barrier discharge cold plasma and the other five were treated by glow discharge cold plasma. The treatment time in each five groups was 2, 4, 6, 8 and 10 min, respectively. The disinfection of Enterococcus faeccalis biofilm was evaluated by colony forming unit (CFU) counting. The plasma component produced by different devices was analyzed by optical emission spectroscopy (OES).
  
  
  RESULTS
  Comparing the two plasma treatments, the plasma produced by dielectric barrier discharge had better bactericidal effect than that produced by glow discharge at different treatment time (P < 0.05). The advantage was obvious with the time getting longer. The OES indicated that active components of the two type plasmas were similar. But the peak of excited Ar atom of dielectric barrier discharge was twice as that of glow discharge.
  
  
  CONCLUSIONS
  The cold plasma produced by dielectric barrier discharge has more bactericidal efficiency in the treatment of root canal infected with Enterococcus faecalis biofilms.
authors.affiliation: Dept. of Oral Medicine, School of Stomatology, Lanzhou University, Lanzhou 730000, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Sun
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Yang
authors.forename: Guopin
authors.initials: G
authors.lastname: Ye
authors.forename: Hong
authors.initials: H
authors.lastname: Pan
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
mesh_terms: D018441:Biofilms; D003786:Dental Pulp Cavity; D013293:Enterococcus faecalis; D006801:Humans; D058626:Plasma Gases; D012390:Root Canal Therapy; D012973:Sodium Hypochlorite
chemical_list: D058626:Plasma Gases; D012973:Sodium Hypochlorite