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Abstract
The purpose of this study was to evaluate the microtensile bond strength (µTBS), failure modes and bonding interfaces of self-etching and three self-adhesive resin cements to dentin and indirect composite resin.
Cylindrical composite blocks (Tescera, Bisco Inc.) were luted with resin cements (PA: Panavia F 2.0, Kuraray Medical Inc., RE: RelyX Unicem Clicker, 3M ESPE., MA: Maxem, Kerr Co., BI: BisCem, Bisco Inc.) on the prepared occlusal dentin surfaces of 20 extracted molars. After storage in distilled water for 24 h, 1.0 mm × 1.0 mm composite-dentin beams were prepared. µTBS was tested at a cross-head speed of 0.5 mm/min. Data were analyzed with one-way ANOVA and Tukey's HSD test. Dentin sides of all fractured specimens and interfaces of resin cements-dentin or resin cements-composite were examined at FE-SEM (Field Emission-Scanning Electron Microscope).
In conclusion, PA and RE showed higher bond strength and closer adaptation than MA and BI when indirect composite blocks were luted to dentin using a self-etching and three self-adhesive resin cements.
Figures and Tables
Figure 1
SEM micrograph of dentin side showing a representative cohesive failure within Panavia F 2.0 (× 130).
Figure 2
SEM micrograph showing remnant fractured filler (F) and cement (C) on the surface of fractured Panavia F 2.0 (× 5,000).
Figure 3
SEM micrograph of dentin side showing a representative mixed failure with a thin layer of RelyX Unicem Clicker on the dentin surface (× 130).
Figure 4
SEM micrograph of dentin side showing a representative adhesive failure of Maxcem along dentin surface (× 130).
Figure 5
SEM micrograph showing remnant a few small sized filler (F) and cement (C) on the dentin surface and fractured Maxem (× 5,000).
Figure 6
SEM micrograph of dentin side showing a representative adhesive failure of BisCem along dentin surface (× 130).
Figure 7
SEM micrograph showing gap (G), about 5 µm wide, between the composite resin (R)-Panavia F 2.0 (P), and close adaptation with numerous short and long resin tags between the Panavia F 2.0-dentin (D) (× 600).
Figure 8
SEM micrograph showing wide gap (G), about 70 µm wide, between the composite resin (R)-RelyX Unicem Clicker (RU), and close adaptation with a few short resin tags between RelyX Unicem Clicker-dentin (D) (× 600).
Figure 9
SEM micrograph showing wide gap (G), about 60 µm wide, between the composite resin (R)-Maxcem (M), and discontinuous 1-2 µm wide gaps(g) between Maxem-dentin (D) (× 600).
Figure 10
SEM micrograph showing gap (G), about 15 µm wide, and a few short resin tags between BisCem (B)-dentin (D) (× 600).
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