Effect of an Immediate Dentin Sealing Technique Using Self-Etch Adhesives on Micro-Tensile Bond Strength of Resin Cement in Indirect Composite Restorations
The purpose of this study was to evaluate the effect of immediate dentin sealing, using either a two-step self-etch adhesive system (Clearfil SE Bond) or one-step self-etch adhesive system (Single Bond Universal Adhesive), on microtensile bond strength of indirect composite restorations luted with Panavia F 2.0 resin cement compared to that without immediate dentin sealing. The fracture patterns of the bonded surfaces were also evaluated. Thirty extracted human upper premolars were randomly allocated into three groups of ten teeth each according to the surface treatments before placing temporary restorations. The occlusal surface of each tooth was cut to expose a flat dentin surface, and polished with 600 grit silicon carbide paper. Two adhesive systems were used as an immediate dentin sealing agent after tooth preparation in the two tested groups. For the control group, no immediate dentin sealing material was used. After dentin surface treatments, Cavit G was placed on the surface of each tooth as a temporary restoration. The prepared tooth specimens were kept in distilled water for 24 hours. Then the temporary material was removed and the surface was cleaned with pumice slurry. Each tooth was then bonded to an indirect composite rod with Panavia F 2.0 resin cement. The tooth-indirect composite assemblies were then sectioned into match-stick liked microbeams for micro-tensile bond strength testing. Twelve representative microbeams with a cross sectional area between 0.8 mm2 and 1.0 mm2 from each group were selected for micro-tensile bond strength testing using a universal testing machine. After testing, the failure modes of the specimens were evaluated under a scanning electron microscope. Among the three approaches, the micro-tensile bond strength of the Clearfil SE Bond group (18.61±3.01 MPa) was significantly higher than the Single Bond Universal Adhesive group (12.94±5.43 MPa) and the control group (9.34±4.21 MPa). The micro-tensile bond strength of the Single Bond Universal Adhesive group and control group were not significantly different. Failure mode analysis showed adhesive failure in all specimens. Within the limitations of this study, it may be concluded that Clearfil SE Bond provided a higher bond strength when used as an immediate dentin sealing agent than did Single Bond Universal Adhesive in the same self-etch mode. In addition, sealing the prepared dentin surface immediately with dentin adhesives before placing a temporary restoration showed a tendency to improve the bond strength of the luting resin cement compared to the conventional cementation technique when Panavia F 2.0 resin cement was used.
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