title: Bonding potential of self-adhesive luting agents used at different temperatures to lute composite onlays.
abstract: OBJECTIVE
  To assess whether the bonding potential to dentin of self-adhesive resin cements was affected by their pre-cure temperature.
  
  
  METHODS
  Composite overlays (Paradigm MZ100, 3M ESPE) were luted on 100 extracted molars with G-Cem (GC Corp.), BisCem (Bisco), Multilink Sprint (Ivoclar Vivadent), SAC-A (Kuraray Co.), XP Bond/Calibra (Detrey Dentsply). The cements were used at pre-cure temperatures that recur in their handling (4 degrees C refrigerator, 24 degrees C room and 37 degrees C intraoral), as well as following pre-heating up to 60 degrees C. Microtensile bond strengths to dentin were measured and compared with statistical tests. Scanning electron microscope observations of cement-dentin interfaces were performed.
  
  
  RESULTS
  The bond strength of G-Cem and Calibra was not significantly affected by temperature changes from refrigerator storage to intraoral application. At any assessed pre-cure temperature the total-etch luting agent Calibra achieved a significantly stronger adhesion than the auto-adhesive cements. Limited to null adhesion was yielded by BisCem and SAC-A. The procedure of 60 degrees C pre-heating, proposed in previous studies for restorative resin composites, was of no use for the tested luting agents. Only the total-etch luting agent Calibra developed a distinct hybrid layer. The self-adhesive cements exhibited a more superficial interaction with dentin.
  
  
  CONCLUSIONS
  Regardless of the pre-cure temperature, the bonding potential of the self-adhesive resin cements was inferior to that of the total-etch luting agent tested as control. The adhesive properties of the BisCem and SAC-A were extremely scarce.
authors.affiliation: Department of Dental Materials and Fixed Prosthodontics, University of Siena, Policlinico Le Scotte, viale Bracci, Siena 53100, Italy.
authors.forename: Amerigo
authors.initials: A
authors.lastname: Cantoro
authors.forename: Cecilia
authors.initials: C
authors.lastname: Goracci
authors.forename: Carlos Augusto
authors.initials: CA
authors.lastname: Carvalho
authors.forename: Ivanovic
authors.initials: I
authors.lastname: Coniglio
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari