title: An in vitro evaluation of effect of eugenol exposure time on the shear bond strength of two-step and one-step self-etching adhesives to dentin.
abstract: OBJECTIVE
  To evaluate the effect of the eugenol exposure time of an eugenol-based provisional restorative material on the shear bond strength of two-step and one-step self-etching adhesives to dentin, at three different time intervals of 24 h, 7 days, and 14 days.
  
  
  METHODS
  Forty extracted human posterior teeth were sectioned mesiodistally to obtain two halves and the resulting 80 halves were randomly assigned into four groups of 20 specimens each (Group-I, -II, -III, and -IV). Cavities of specified dimensions were prepared to expose dentin surface. In Group-I, temporarization was carried out with noneugenol cement (Orafil-G) for 24 h (control group). In Group-II, -III, and -IV, temporarization was carried out with eugenol cement (intermediate restorative material (IRM)) for 24 h, 7 days, and 14 days, respectively. Each group was further divided into two subgroups of 10 teeth each for two-step (Adper SE Plus) and one-step (Adper Easy One) self-etch adhesive systems, respectively. A plastic tube loaded with microhybrid composite resin (Filtek Z-350, 3M) was placed over the dentin surface and light cured. The specimens were subjected to shear stress in universal testing machine.
  
  
  RESULTS
  Group-II yielded low shear bond strength values compared with Group-III, -IV, and Group-I, which was statistically significant.
  
  
  CONCLUSIONS
  The prior use of eugenol containing temporary restorative material reduced the bond strength of self-etch adhesive systems at 24-h period. No reduction in bond strength at 7 or 14 days exposure was observed with either two-step or one-step self-etch adhesive.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Amrith Educational and Cultural Society Maaruti College of Dental Sciences and Research Centre, Bangalore, Karnataka, India.
authors.forename: Farhat
authors.initials: F
authors.lastname: Nasreen
authors.affiliation: Department of Conservative Dentistry and Endodontics, Amrith Educational and Cultural Society Maaruti College of Dental Sciences and Research Centre, Bangalore, Karnataka, India.
authors.forename: Anila Bandlapalli Sreenivasa
authors.initials: AB
authors.lastname: Guptha
authors.affiliation: Department of Conservative Dentistry and Endodontics, Amrith Educational and Cultural Society Maaruti College of Dental Sciences and Research Centre, Bangalore, Karnataka, India.
authors.forename: Raghu
authors.initials: R
authors.lastname: Srinivasan
authors.affiliation: Department of Conservative Dentistry and Endodontics, Amrith Educational and Cultural Society Maaruti College of Dental Sciences and Research Centre, Bangalore, Karnataka, India.
authors.forename: Mahesh Martur
authors.initials: MM
authors.lastname: Chandrappa
authors.affiliation: Department of Conservative Dentistry and Endodontics, Amrith Educational and Cultural Society Maaruti College of Dental Sciences and Research Centre, Bangalore, Karnataka, India.
authors.forename: Shreetha
authors.initials: S
authors.lastname: Bhandary
authors.affiliation: Department of Conservative Dentistry and Endodontics, Amrith Educational and Cultural Society Maaruti College of Dental Sciences and Research Centre, Bangalore, Karnataka, India.
authors.forename: Pramod
authors.initials: P
authors.lastname: Junjanna
keywords: Eugenol-based cement; self-etch adhesive; shear bond strength