title: An in-vitro evaluation of sealing ability of real seal using fluid filtration.
abstract: BACKGROUND
  The aim of this study was to compare the sealing ability of Real Seal (RS) and Gutta-percha (GP).
  
  
  METHODS
  Forty nine extracted human maxillary central incisors were used. The coronal part of each tooth was removed, the root canal was prepared using the crown down technique and apical enlargement to rotary file # 40. The specimens were randomly divided in to 3 groups of 15 each and two control groups of 2 each. Group 1, was obturated with RS and group 2 and 3 were obturated with GP and AH26 sealer by lateral condensation technique. In group 1 and 3 the smear layer was removed by 5mL of 5.25% NaOCl and 3mL of 17% EDTA. Leakage of the obturated roots was measured using the fluid filtration technique. This method was done at 2 min intervals for 8 min. data were analyzed using ANOVA and Tukey tests.
  
  
  RESULTS
  Statistical analysis indicated significant differences between groups 2 with 1 and 3. The most leakage value was observed in the group 2.
  
  
  CONCLUSIONS
  Root canal filling with RS or GP in combination with smear layer removal showed better sealing. Therefore the smear layer has more effect one apical leakage than the obturation system.
authors.affiliation: Department of Endodontics, Member of Dental Research Center, Dental School, Mashad University of Medical Sciences, Mashad, Iran.
authors.forename: Mina
authors.initials: M
authors.lastname: Zarei
authors.affiliation: Department of Endodontics, Member of Dental Research Center, Dental School, Mashad University of Medical Sciences, Mashad, Iran.
authors.forename: Maryam
authors.initials: M
authors.lastname: Javidi
authors.affiliation: Department of Endodontics, Member of Dental Research Center, Dental School, Mashad University of Medical Sciences, Mashad, Iran.
authors.forename: Jamileh
authors.initials: J
authors.lastname: Ghoddusi
authors.affiliation: Department of Endodontics, Dental School, Mashad University of Medical Sciences, Mashad, Iran.
authors.forename: Neda
authors.initials: N
authors.lastname: Naghavi
authors.affiliation: Department of Restorative Dentistry , Dental School, Mashad University of Medical Sciences, Mashad, Iran.
authors.forename: Ehsan
authors.initials: E
authors.lastname: Roohani
keywords: Fluid Filtration; Real Seal; Sealing Ability; Smear Layer