title: [Antimicrobial effect of various calcium hydroxide on Porphyromonas endodontalis in vitro].
abstract: OBJECTIVE
  To compare the antimicrobial activity of Endocal, calcium hydroxide paste, Calxyl, Vitapex on Porphyromonas endodontalis(P.e).
  
  
  METHODS
  (1) The antimicrobial activity of different calcium hydroxide on P.e was examined at different exposure times by dynamic nephelometry. (2) 85 freshly extracted single-rooted human teeth were selected and cut at the amelocemental junction. All roots were randomly divided into five groups. The bacteria were incubated in each canal and were sampled and counted before and after enveloping five kinds of intercanal medicine seeded. Student's t test, One-way ANOVA were used with SPSS11.0 software package for statistical analysis.
  
  
  RESULTS
  The bacteria from each group were reduced significantly after intracanal medication (P<0.05). The antibacterial efficacy of Endocal and calcium hydroxide paste were superior to others under dynamic nephelometry test (P<0.05). Endocal, calcium hydroxide paste, Calxyl, Vitapex had strong inhibitory effect on P.e from infected root canals, and the rate of bacteria clearance was 95%. The antimicrobial activity of Endocal was significantly greater than others (P<0.05).
  
  
  CONCLUSIONS
  Endocal, calcium hydroxide paste, Calxyl and Vitapex were effective for intercanal disinfection. The antibacterial activity of Endocal is greater than Vitapex.
authors.affiliation: Department of Endodontics, China Medical University, Shenyang, Liaoning Province, China. dudu5211314-001@163.com
authors.forename: Ting-ting
authors.initials: TT
authors.lastname: Du
authors.forename: Li-hong
authors.initials: LH
authors.lastname: Qiu
authors.forename: Ge
authors.initials: G
authors.lastname: Jia
authors.forename: Di
authors.initials: D
authors.lastname: Yang
authors.forename: Yan
authors.initials: Y
authors.lastname: Guo
mesh_terms: D000890:Anti-Infective Agents; D017610:Calcium Compounds; D002126:Calcium Hydroxide; D006801:Humans; D066298:In Vitro Techniques; D010087:Oxides; D045202:Porphyromonas endodontalis; D011897:Random Allocation; D012387:Root Canal Filling Materials; D012828:Silicones; D014092:Tooth Root
chemical_list: D000890:Anti-Infective Agents; D017610:Calcium Compounds; D010087:Oxides; D012387:Root Canal Filling Materials; D012828:Silicones; C029584:calcium hydroxide, iodoform, silicone oil drug combination; C016538:lime; D002126:Calcium Hydroxide