title: Comparison of apical microleakage using Ni-Ti with stainless steel finger spreaders.
abstract: BACKGROUND
  The purpose of this in vitro study was to compare apical microleakage after obturation with Nickel-Titanium (NiTi) compared to Stainless Steel (SS) finger spreaders.
  
  
  METHODS
  Eighty straight single-rooted human teeth were instrumented using step-back technique. The specimens were randomly divided into four groups. The two experimental groups (n=30) and the negative control group (n=10) were obturated by lateral condensation technique with Ariadent gutta-percha and AH26 sealer. The roots in the positive control group (n=10) were instrumented but not obturated. In one group, SS and in another group NiTi spreaders were used. Microleakage evaluation was conducted using dye penetration method t-test was used for statistical analysis.
  
  
  RESULTS
  The results showed statistically significant differences between NiTi and SS groups (P=0.022), with the greatest dye penetration in SS group and the least in NiTi group.
  
  
  CONCLUSIONS
  According to the results of the present study using NiTi spreader decrease apical microleakage in endodontically treated teeth. [Iranian Endodontic Journal 2009;4(4):149-51].
authors.affiliation: Department of Endodontics, Dental School, Tabriz University of Medical Sciences, Tabriz, Iran.
authors.forename: Shahriar
authors.initials: S
authors.lastname: Shahi
authors.forename: Sahar
authors.initials: S
authors.lastname: Shakouie
authors.forename: Saeed
authors.initials: S
authors.lastname: Rahimi
authors.forename: Hamid Reza
authors.initials: HR
authors.lastname: Yavari
authors.forename: Narmin
authors.initials: N
authors.lastname: Mohammadi
authors.forename: Majid
authors.initials: M
authors.lastname: Abdolrahimi
keywords: Microleakage; NiTi; Spreader; Stainless Steel
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