title: Effect of MTAD on the shear bond strength of self-etch adhesives to dentin.
abstract: BACKGROUND
  As the use of different irrigants to eliminate residual debris and smear layer in the field of endodontic is unavoidable, by considering the effect of irrigants on the bond strength of resin composite restorations, this study was designed to evaluate the effect of a mixture of a tetracycline isomer, an acid, and a detergent (MTAD) on the shear bond strength of two self-etch adhesives, Clearfil SE Bond and Adper Prompt L- Pop to dentin.
  
  
  METHODS
  The crowns of 80 extracted premolars were transversally sectioned to expose dentin. Flat dentin surfaces were wet abraded with 320-grit abrasive paper and randomly assigned to eight groups according to two self-etch adhesive and four dentin surface treatments: direct application over smear layer (no treatment), etching with 35% phosphoric acid for 15s, 1 min 5.25% NaOCl/1 min MTAD and 20min 1.3% NaOCl/5min MTAD. Shear bond strength was tested 24 h after storage in distilled water at 37°C in incubator. Data were analyzed using one-way ANOVA followed by duncan post-hoc (α=0.05).
  
  
  RESULTS
  Phosphoric acid etching prior to SE Bond application significantly decreased the shear bond strength to dentin (P<0.05). Application of MTAD clinical protocol (20min 1.3% NaOCl/5min MTAD) did not significantly decrease the shear bond strength of self-etch adhesives to dentin (P=0.745)
  
  
  CONCLUSIONS
  Based on the results of present investigation, it seems that the use of clinical protocol of 1.3% NaOCl as a root canal irrigant and a 5-min application of MTAD as a final rinse to remove the smear layer has no adverse effect on the shear bond strength of self-etch adhesives to dentin.
authors.affiliation: Dental Research Center and Department of Restorative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
authors.forename: Vajihesadat
authors.initials: V
authors.lastname: Mortazavi
authors.forename: Abbasali
authors.initials: A
authors.lastname: Khademi
authors.forename: Kazem
authors.initials: K
authors.lastname: Khosravi
authors.forename: Mohammadhossein
authors.initials: M
authors.lastname: Fathi
authors.forename: Mohammadesmaeil
authors.initials: M
authors.lastname: Ebrahimi-Chaharom
authors.forename: Shirin
authors.initials: S
authors.lastname: Shahnaseri
authors.forename: Navid
authors.initials: N
authors.lastname: Khalighinejad
authors.forename: Hamid
authors.initials: H
authors.lastname: Badrian