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  • Title: Influence of 3-month Simulated Pulpal Pressure on the Microtensile Bond Strength of Simplified Resin Luting Systems.
    Author: Bacchi A, Abuna G, Babbar A, Sinhoreti MA, Feitosa VP.
    Journal: J Adhes Dent; 2015 Jun; 17(3):265-71. PubMed ID: 26159130.
    Abstract:
    PURPOSE: To assess the influence of simulated pulpal pressure (SPP) on the microtensile bond strength (μTBS) of four simplified luting strategies to indirect composite restorations. MATERIALS AND METHODS: Dentin disks from 40 human molars were prepared and treated with 4 different techniques: (1) SB+ARC: two-step etch-and-rinse adhesive + conventional dual-curing resin cement (Adper Single Bond 2 + RelyX ARC, 3M ESPE); (2) ED+PAN: self-etching primer + conventional dual-curing resin cement (ED Primer + Panavia F2.0, Kuraray Medical); (3) S3+PAN: one-step self-etching adhesive (Clearfil S3, Kuraray) + Panavia F2.0; (4) U200: self-adhesive resin cement (RelyX U200, 3M ESPE). Pre-made indirect composite restorations (Filtek Z100, 3M ESPE) were luted onto the specimens. The luted specimens were cut into resin-dentin beams and the μTBS was tested after two different aging regimes: water storage at 37°C for one week (control) or three months under 20 cm H2O simulated pulpal pressure (SPP). The μTBS data was analyzed with two-way ANOVA and Tukey's test (p < 0.05). RESULTS: SB+ARC showed significantly higher μTBS after both aging regimes (p < 0.001). The statistically significantly lowest μTBS was measured for control S3+PAN and U200 after 3 months SPP (p < 0.001). S3+PAN was the only group not negatively affected by SPP (p = 0.699). CONCLUSIONS: Two-step etch-and-rinse adhesives associated with dual-curing conventional resin cements may achieve the highest μTBS, even after 3 months of SPP. The one-step self-etching adhesive along with the dualcuring conventional resin cement was able to maintain bond stability.
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