title: Effect of cementation technique of individually formed fiber-reinforced composite post on bond strength and microleakage.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effect of two different cementation techniques of individually formed E-glass fiber-reinforced composite (FRC) post on bond strength and microleakage.
  
  
  METHODS
  The crowns of extracted third molars were removed and post preparation was carried out with parapost drills (diameter 1.5 mm). After application of bonding agents individually formed FRC posts (everStick POST, diameter 1.5 mm) were cemented into the post spaces with either ParaCem®Universal or self-adhesive RelyX™Unicem, using two different cementation techniques: 1) an "indirect (traditional) technique" where the post was prepolymerized prior application of luting cement and insertion into the post space or 2) a "direct technique" where the uncured post was inserted to the post space with luting cement and light-polymerized in situ at the same time. After water storage of 48 hours, the roots (n = 10/group) were cut into discs of thickness of 2 mm. A push-out force was applied until specimen fracture or loosening of the post. A microleakage test was carried out on roots which were not subjected to the loading test (n= 32) to evaluate the sealing capacity of the post-canal interface. The microleakage was measured using dye penetration depth under a stereomicroscope.
  
  
  RESULTS
  Higher bond strength values (p<0.05) and less microleakage (p<0.05) were obtained with the "direct technique" compared to the "indirect technique". None of the FRC posts revealed any dye penetration between the post and the cement.
  
  
  CONCLUSIONS
  The "direct technique" seems to be beneficial when cementing individually formed FRC posts.
authors.affiliation: Department of Biomaterials Science, Institute of Dentistry and BioCity Turku Biomaterials Research Program, University of Turku, FI-20520, Turku, Finland.
authors.forename: Dominika
authors.initials: D
authors.lastname: Makarewicz
authors.forename: Anna-Maria B
authors.initials: AM
authors.lastname: Le Bell-Rönnlöf
authors.forename: Lippo V J
authors.initials: LV
authors.lastname: Lassila
authors.forename: Pekka K
authors.initials: PK
authors.lastname: Vallittu
keywords: Bond strength; Cementation technique; Custom-made fiber post; Dye penetration; Fiber-reinforced composite root canal post; Individually formed fiber post; Microleakage; Push-out force.