title: Bond Strength of 5(th), 6(th) and 7(th) Generation Bonding Agents to Intracanal Dentin of Primary Teeth.
abstract: OBJECTIVE
  This in-vitro study sought to assess the push-out bond strength of a total etch and 2 self-etch bonding systems to intracanal dentin of primary anterior teeth (PAT).
  
  
  METHODS
  Thirty-six primary anterior teeth were randomly divided into 3 groups of 5(th) generation (Single Bond 2), 6(th) generation (Clearfil SE) and 7(th) generation (Single Bond Universal) bonding agents. The canal orifice was restored with composite resin and the push-out test was carried out to assess the bond strength. After applying the push-out load, specimens were evaluated under a light microscope at 40X magnification. One-way ANOVA and log-rank test on Kaplan-Meier curves were applied for the comparison of bond strength among the 3 groups.
  
  
  RESULTS
  The mean± standard deviation (SD) bond strength was 13.6±5.33 MPa for Single Bond 2, 13.85±5.86 MPa for Clearfil SE and 12.28±5.24 MPa for Single Bond Universal. The differences in bond strength among the 3 groups were not statistically significant (P>0.05).
  
  
  CONCLUSIONS
  All three bonding agents are recommended for use with composite posts in PAT. However, due to high technical sensitivity of the Total Etch system, single or two-step self etch systems may be preferred for uncooperative children.
authors.affiliation: Associate Professor, Dental Research Center Dentistry Research Institute, Department of Pediatric, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Hossein
authors.initials: H
authors.lastname: Afshar
authors.affiliation: Associate Professor, Dental Research Center Dentistry Research Institute, Department of Pediatric, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Yahya
authors.initials: Y
authors.lastname: Baradaran Nakhjavani
authors.affiliation: Associate Professor, Department of Oral and Maxillofacial Pathology, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Sedighe
authors.initials: S
authors.lastname: Rahro Taban
authors.affiliation: Assistant Professor, Department of Pediatric, Faculty of Dentistry, Golestan University of Medical Sciences, Golestan, Iran.
authors.forename: Zahra
authors.initials: Z
authors.lastname: Baniameri
authors.affiliation: Associate Professor, Department of Pediatric, Faculty of Dentistry, Mazandaran University of Medical Sciences, Sari, Iran.
authors.forename: Azam
authors.initials: A
authors.lastname: Nahvi
keywords: Bond strength; Bonding agents; Primary teeth