title: Effect of the seating pressure on the adhesive bonding of indirect restorations.
abstract: OBJECTIVE
  To evaluate the effect of two different techniques of seating pressure application on the adhesive-dentin bond of indirect restorations.
  
  
  METHODS
  Eight non-carious human third molars were randomly divided in two treatment groups (four teeth each). Cylindrical composite blocks were luted with a resin cement (Panavia F). In Group 1, the seating pressure was applied for 5 seconds. In Group 2, the resin cylinder was maintained under constant pressure during the entire 3-minute polymerization period of the resin cement. After storing in distilled water for 24 hours, 0.9 x 0.9 mm sticks were produced from these luted specimens for microtensile bond testing and SEM examination.
  
  
  RESULTS
  The Student t-test showed a significant difference (P < 0.05) in bond strength between Groups 1 and 2. SEM revealed the presence of structural defects and resin globules on the seating surface of the composites. These features were exclusively identified from Group 1 specimens and were probably caused by fluid transudation from the underlying dentin through the simplified self-etch adhesive (ED primer).
authors.affiliation: Department of Restorative Dentistry and Dental Materials, University of Siena, Italy.
authors.forename: Nicoletta
authors.initials: N
authors.lastname: Chieffi
authors.forename: Stefano
authors.initials: S
authors.lastname: Chersoni
authors.forename: Federica
authors.initials: F
authors.lastname: Papacchini
authors.forename: Michele
authors.initials: M
authors.lastname: Vano
authors.forename: Cecilia
authors.initials: C
authors.lastname: Goracci
authors.forename: Carel L
authors.initials: CL
authors.lastname: Davidson
authors.forename: Franklin R
authors.initials: FR
authors.lastname: Tay
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
mesh_terms: D001840:Dental Bonding / Q000379:methods*; D003799:Dental Stress Analysis; D003804:Dentin / Q000648:ultrastructure; D019234:Dentinal Fluid; D006801:Humans; D007284:Inlays; D008855:Microscopy, Electron, Scanning; D008964:Molar, Third; D044367:Phase Transition; D011312:Pressure; D019279:Resin Cements; D013718:Tensile Strength
chemical_list: C438843:Panavia-Fluoro; D019279:Resin Cements