title: The importance of final rinse after disinfection of gutta-percha and Resilon cones.
abstract: OBJECTIVE
  The aim of this study was to evaluate the morphologic alterations on the surface of gutta-percha and Resilon cones exposed to disinfectant solutions.
  
  
  METHODS
  Fifty-six gutta-percha and Resilon cones were used. Seven groups were analyzed: G1: control; G2, G3, and G4: 5.25% NaOCl, 2% CHX, and MTAD, respectively, without final rinse; G5, G6, and G7: the same solutions with final rinse. Then the samples were analyzed by means of scanning electron microscopy and energy dispersive spectroscopy.
  
  
  RESULTS
  Regarding the use of NaOCl without rinse, there was chloride crystal formation in all samples. When the cones were rinsed, the crystals were removed. When 2% chlorhexidine was used, no change was observed. MTAD without rinse showed the presence of a precipitate in gutta-percha cones. When the cones were rinsed, it was eliminated.
  
  
  CONCLUSIONS
  The final rinse is essential, especially when NaOCl and MTAD are used in the cones' disinfection process.
authors: Department of Metallurgic and Materials Engineering, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil. mairapr@hotmail.com
authors: Maíra
authors: M
authors: Prado
authors: Heloisa
authors: H
authors: Gusman
authors: Brenda P F A
authors: BP
authors: Gomes
authors: Renata A
authors: RA
authors: Simão
mesh_terms: D002710:Chlorhexidine / Q000737:chemistry; D019343:Citric Acid / Q000737:chemistry; D004203:Disinfection / Q000379:methods*; D004318:Doxycycline / Q000737:chemistry; D006171:Gutta-Percha / Q000737:chemistry*; D006801:Humans; D011136:Polysorbates / Q000737:chemistry; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012388:Root Canal Irrigants / Q000737:chemistry*; D012973:Sodium Hypochlorite / Q000737:chemistry; D013499:Surface Properties / Q000187:drug effects
chemical_list: C475043:MTAD (intracanal irrigant); D011136:Polysorbates; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; C486892:resilon sealer; D019343:Citric Acid; D006171:Gutta-Percha; D012973:Sodium Hypochlorite; D004318:Doxycycline; D002710:Chlorhexidine