title: Effect of root canal rinsing protocol on dentin bond strength of two resin cements using three different method of test.
abstract: BACKGROUND
  Different studies have used different tests to evaluate bond strength of resin cements to root dentin. In this in vitrostudy, three different tests were used to evaluate the bond strength of two resin cements to root dentin using two root dentin irrigation protocols.
  
  
  METHODS
  Ninety-six intact single-rooted teeth were selected for this study. Forty-eight teeth, with a root length of 15mm, were randomly divided into two groups and irrigated with normal saline or 2.5% sodium hypochlorite solutions during root canal preparation, respectively. For each 12 specimens from each group, fiber post #1 was bonded using an etch-and-rinse (Duo-Link) and a self-adhesive (BisCem) resin cement, respectively. After incubation, two specimens were prepared for the push-out test from the middle thirds of the roots. In another 24 teeth, after two 1.5-mm sections were prepared from the middle thirds of the prepared roots, sections of the post were bonded in two subgroups with each of the cements mentioned above and the samples were prepared for the pull-out test. For shear test, the crowns of 48 teeth were cut away, the dentin surfaces were prepared, the two irrigation solutions were used, and the resin cements were bonded. Data collected from the three tests were evaluated by ANOVA, post-hoc Tukey and Weibull tests (α=0.05).
  
  
  RESULTS
  There were significant differences in the mean bond strength values between the three bond strength tests (P<0.001). Rinsing protocol and cement type resulted in similar variations in the mean bond strength in all tests (P>0.05).
  
  
  CONCLUSIONS
  Under the limitations of the present study, the method of the test used had an effect on the recorded bond strength between the resin cement and root dentin. Cement type and irrigation protocol resulted in similar variations with all the tests. Push-out and shear tests exhibited more coherent results.
  
  
  BACKGROUND
  Bond strength, endodontically treated tooth, fiber post, resin cement, sodium hypochlorite.
authors.affiliation: DDS, MSc, Professor. Dental Materials Research Center and Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Maryam
authors.initials: M
authors.lastname: Khoroushi
authors.affiliation: DDS. Torabinejad Dental Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Mohammadreza
authors.initials: M
authors.lastname: Sheikhi
authors.affiliation: BS candidate. Electrical engineer, Department of Electrical and Computer Engineering, Isfahan University of Technology, Isfahan, Iran.
authors.forename: Amirhossein
authors.initials: A
authors.lastname: Khalilian-Gourtani
authors.affiliation: BS, PhD, Assistant Professor. Department of Health and Statistics, Islamic Azad University, Najafabad, Isfahan.
authors.forename: Bahram
authors.initials: B
authors.lastname: Soleimani