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Enhanced shear bond strength of IPS Empress 2 restorations on dentin using MDPB-modified adhesive system: A
Chen Qu1, Lijun Chen2, Yongliang Zhang3
1Department of Stomatology, Department of Stomatology, Beijing Luhe Hospital affiliated to Capital Medical University, Beijing, China.
Purpose:
To evaluate the shear bond strength of restorative resin agents incorporating the antibacterial monomer methacryloyloxy-dodecylpyridinium bromide (AM-MDPB) when bonding IPS Empress 2 ceramic restorations to dentin.
Methods:
216 all-ceramic IPS Empress 2 discs (3 mm diameter, 4 mm height) were prepared with various dual-polymerizing (DP) luting systems, including Panavia F 2.0 and Variolink 2, to cement these restorations to prepared dentin surfaces. The study assessed the impact of a dentin adhesive solution with AM-MDPB (Clearfil Protective Adhesive, CPA) on the shear bond strength of these restorations. Human premolars (n=216) were prepared to expose the dentin surface, which was polished with silicon carbide sandpaper. Specimens were randomly divided into four groups based on luting system and application of CPA. Shear bond strength was measured after thermal cycling, and failure modes were analyzed using an Image Analyzer. The data were analyzed using two-way ANOVA.
Results:
The findings demonstrated a significant enhancement in the shear bond strength of all DP luting systems to dentin with the application of the antimicrobial adhesive. The mean shear bond strength (SBS) values in MPa for Panavia F 2.0, Panavia F 2.0 with CPA, Variolink 2, and Variolink 2 with CPA were 18.11 ± 2.98, 25.40 ± 7.46, 21.45 ± 4.75, and 29.32 ± 2.37, respectively. Most samples exhibited adhesive failure at the interface between the restorative resin agent and dentin.
Clinical Significance:
The study confirmed that the use of Clearfil Protective Adhesive in dual polymerizing techniques effectively increases the shear bond strength of IPS Empress 2 ceramic restorations to dentin without compromising the integrity of the bonded interface.
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