title: Effect of sodium hypochlorite on human pulp cells: an in vitro study.
abstract: BACKGROUND
  The purpose of this study was to determine the effect of sodium hypochlorite (NaOCl) on human pulp cells to provide an aid in determining its optimum concentration in maintaining the viability of remaining pulp cells in the revascularization of immature permanent teeth with apical periodontitis.
  
  
  METHODS
  Human pulp tissue cells taken from extracted third molars were plated, incubated, and subjected to various concentrations of NaOCl (0.33%, 0.16%, 0.08%, and 0.04%) for 5-, 10-, and 15-minute time intervals to simulate possible contact times in vivo. The Cell Titer-Glo Luminescent Cell Viability Assay was used to determine the number of viable cells present in culture following treatment.
  
  
  RESULTS
  The results showed an increase in cell viability with the lowering of NaOCl concentration. The use of 0.04% NaOCl was similar to the control, indicating nearly complete preservation of cell viability at all time intervals tested. As sodium hypochlorite concentration increased from 0.04% to 0.33%, cell viability decreased correspondingly.
  
  
  CONCLUSIONS
  The results indicate that the lowest concentration of NaOCl tested did not affect the viability of cells. This may prove beneficial in developing a new treatment protocol to help preserve existing vital pulp cells in revascularization cases.
authors.affiliation: Department of Endodontics, University of Alabama School of Dentistry, Birmingham, Alabama 35294, USA.
authors.forename: Mark D
authors.initials: MD
authors.lastname: Essner
authors.forename: Amjad
authors.initials: A
authors.lastname: Javed
authors.forename: Paul D
authors.initials: PD
authors.lastname: Eleazer
mesh_terms: D002452:Cell Count; D002478:Cells, Cultured; D003782:Dental Pulp / Q000166:cytology / Q000187:drug effects* / Q000502:physiology; D004202:Disinfectants / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D006801:Humans; D018919:Neovascularization, Physiologic / Q000187:drug effects*; D010485:Periapical Periodontitis / Q000188:drug therapy*; D010865:Pilot Projects; D012038:Regeneration / Q000187:drug effects* / Q000502:physiology; D012388:Root Canal Irrigants / Q000494:pharmacology*; D012973:Sodium Hypochlorite / Q000494:pharmacology*
chemical_list: D004202:Disinfectants; D012388:Root Canal Irrigants; D012973:Sodium Hypochlorite