title: Shear Bond Strength of Superficial, Intermediate and Deep Dentin In Vitro with Recent Generation Self-etching Primers and Single Nano Composite Resin.
abstract: BACKGROUND
  This in vitro study is intended to compare the shear bond strength of recent self-etching primers to superficial, intermediate, and deep dentin levels.
  
  
  METHODS
  All teeth were sectioned at various levels and grouped randomly into two experimental groups and two control groups having three subgroups. The experimental groups consisted of two different dentin bonding system. The positive control group consisted of All Bond 2 and the negative control group was without the bonding agent. Finally, the specimens were subjected to shear bond strength study under Instron machine. The maximum shear bond strengths were noted at the time of fracture. The results were statistically analyzed.
  
  
  RESULTS
  Comparing the shear bond strength values, All Bond 2 (Group III) demonstrated fairly higher bond strength values at different levels of dentin. Generally comparing All Bond 2 with the other two experimental groups revealed highly significant statistical results.
  
  
  CONCLUSIONS
  In the present investigation with the fourth generation, higher mean shear bond strength values were recorded compared with the self-etching primers. When intermediate dentin shear bond strength was compared with deep dentin shear bond strength statistically significant results were found with Clearfil Liner Bond 2V, All Bond 2 and the negative control. There was a statistically significant difference in shear bond strength values both with self-etching primers and control groups (fourth generation bonding system and without bonding system) at superficial, intermediate, and deep dentin. There was a significant fall in bond strength values as one reaches deeper levels of dentin from superficial to intermediate to deep.
authors.affiliation: Consultant, DENTEM Dental and Orthodontic Clinic, F4/4, Vasant Vihar, New Delhi.
authors.forename: Kulshrest
authors.initials: K
authors.lastname: Singh
authors.affiliation: Head, Department of Conservative Dentistry and Endodontics, AJ Institute of Dental Sciences, Mangalore, Karnataka, India.
authors.forename: Rajaram
authors.initials: R
authors.lastname: Naik
authors.affiliation: Professor, Department of Conservative Dentistry and Endodontics, AJ Institute of Dental Sciences, Mangalore, Karnataka, India.
authors.forename: Srinidhi
authors.initials: S
authors.lastname: Hegde
authors.affiliation: Professor, Department of Public Health Dentistry, AJ Institute of Dental Sciences, Mangalore, Karnataka, India.
authors.forename: Aftab
authors.initials: A
authors.lastname: Damda
keywords: Self-etching primers; Universal Testing Machine; shear bond strength