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Purpose: The purpose of this study was to compare the microtensile bond strength (microTBS) of three adhesives to bovine enamel prepared with 600-grit silicon carbide paper, diamond rotary instrument, or carbide bur., Materials and Methods: Bovine teeth (n = 36) were randomly divided into three treatment groups and bonded using a total-etch adhesive (Single Bond, 3M ESPE), a self-etching primer system (Clearfil SE Bond, Kuraray), or a self-etching adhesive (One-Up Bond F, Tokuyama). A 4-mm composite crown was built on the bonded surfaces and specimens were stored in water for one day at 37 degrees C. Specimens were sectioned into 0.7-mm-thick slabs, trimmed to a cross-sectional area of 1 mm2, and loaded to failure at a crosshead speed of 1 mm/min using a tabletop tester (EZ-Test, Shimadzu). Microtensile bond strength data were analyzed using ANOVA and Fisher's PLSD test (alpha = 0.05)., Results: The bond strength of each self-etching system was lower when the enamel was prepared using a diamond or carbide bur, rather than with 600-grit silicon carbide paper. Differences in microTBS between carbide- and diamond-prepared surfaces were not significant. The surface preparation method did not affect the total-etch system., Conclusion: Different preparation instruments are unlikely to affect resin-enamel bond strengths.

Purpose: To compare the repair potential of a packable composite (Filtek P60) to that of a conventional hybrid composite (Pertac II) using three different adhesives: an unfilled resin (EBS-Multi), a one-bottle, acetone-based adhesive (One-Step), and a self-etching adhesive (Prompt L-Pop)., Materials and Methods: 30 composite disks (diameter = 8 mm) of each composite material were fabricated, light-cured, and stored in 37 degrees C for 7 days. The specimens were polished to 600-grit, sandblasted (CoJet-System), silanated, and randomly assigned to three groups (n=10). EBS-Multi, One-Step, and Prompt L-Pop were applied to each composite and cured. Pertac II was applied in a #5 gelatin capsule and light-cured. As controls, Pertac II was applied to freshly cured Filtek P60 and Pertac II specimens, with no additional surface treatment. Specimens were loaded in shear using an Instron testing machine at a crosshead speed of 5 mm/minute, 24 hours after bonding, and the peak shear force at failure was converted to MPa (force/area)., Results: ANOVA showed a significant difference in means at P<0.001. Tukey's test was used for pairwise comparisons. Mean SBS (+/-SD, MPa) were: P60/control: 25.2 (3.0); P60/EBS-Multi: 18.0 (2.3); P60/One-Step: 16.7 (2.3); P60/Prompt: 10.5 (3.3); Pertac/control: 25.5 (3.6); Pertac/EBS-Multi: 18.8 (3.0); Pertac/One-Step: 18.8 (2.4); Pertac/Prompt: 9.7 (3.5). Repair strengths were all significantly less than their respective controls, and repairs made using Prompt L-Pop had significantly lower mean strengths than the repairs made with EBS-Multi and One-Step (P<0.05).