title: Scanning electron microscopic study of teeth restored with fiber posts and composite resin: An in vitro study.
abstract: OBJECTIVE
  The aim of this study is to compare and evaluate the thickness of resin dentin interface zones (RDIZ) obtained by luting carbon fiber post to intra-radicular dentin, either with All-Bond 2 bonding agent and C and B composite cement or Panavia F dentin-bonding system and Panavia F resin cement.
  
  
  METHODS
  Twenty single rooted mandibular premolars of similar sizes were prepared for the carbon fiber post after biomechanical preparation and obturation. They were divided into two groups, Group 1 and 2 of 10 samples each. Carbon fiber posts used for Group 1 samples were luted using All-Bond 2 and C and B cement. For Group 2 carbon fiber posts were luted using Panavia F dentin-bonding system and Panavia F resin cement. All the 20 samples were sectioned longitudinally and marked at three points on the length of the tooth from the dentin-core interface to the apex at 2 mm, 5 mm, and 8 mm to get coronal, middle, and apical areas, respectively. The formation and thickness (width) of the RDIZ at the marked areas was evaluated by scanning electron microscope using ×1000 magnification. The results were statistical analyzed.
  
  
  RESULTS
  Irrespective of the adhesive systems used all specimens showed a RDIZ formation. Microscopic examination of Group 1 showed significantly higher percentage of RDIZ (P < 0.05) than Group 2. RDIZ morphology was easily detectable at coronal and middle areas of all specimens.
  
  
  CONCLUSIONS
  All-Bond 2 showed denser and wider RDIZ compared with the Panavia F.
authors.affiliation: Department of Conservative Dentistry, Krishnadevaraya College of Dental Sciences, Bengaluru, Karnataka, India.
authors.forename: K S
authors.initials: KS
authors.lastname: Sridhara
authors.affiliation: Department of Conservative Dentistry, DAPMRV Dental College and Hospital, Bengaluru, Karnataka, India.
authors.forename: Sunil
authors.initials: S
authors.lastname: Mankar
authors.affiliation: Department of Conservative Dentistry, Siddartha Dental College and Hospital, Tumkur, Karnataka, India.
authors.forename: C M
authors.initials: CM
authors.lastname: Jayshankar
authors.affiliation: Department of Prosthodontics, M. R. Ambedkar Dental College and Hospital, Bengaluru, Karnataka, India.
authors.forename: K
authors.initials: K
authors.lastname: Vinaya
keywords: Bonding; fiber post; hybrid layer; resistance