Nanoleakage expression and microshear bond strength in the resin cement/dentin interface

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Restorative Dentistry

Background:

• Dental restorations require durable bonding to tooth structure.
• Resin cements are widely used for luting indirect restorations.
• Evaluating dentin sealing and bond strength is crucial for clinical longevity.

Purpose of the Study:

• To compare the dentin sealing ability of a self-adhesive resin cement (RelyX Unicem) and a resin cement with a self-etching primer (Panavia F2.0).
• To evaluate and compare the microshear bond strength of these two resin cements to dentin.

Main Methods:

• Resin composite overlays were bonded to dentin using either RelyX Unicem or Panavia F2.0.
• Dentin sealing was assessed using ammoniacal silver nitrate penetration and FE-SEM/EDS analysis.
• Microshear bond strength tests were performed after 24-hour water storage.

Main Results:

• No significant difference in microshear bond strength was found between RelyX Unicem (24.9 MPa) and Panavia F2.0 (26.1 MPa).
• RelyX Unicem demonstrated significantly lower silver particle penetration (7.4%) compared to Panavia F2.0 (18.7%), indicating better dentin sealing.
• Nanoleakage analysis showed significantly less penetration for the self-adhesive cement.

Conclusions:

• The microshear bond strengths of the self-adhesive resin cement and the self-etching primer resin cement were comparable.
• The self-adhesive resin cement exhibited superior dentin sealing compared to the resin cement with a self-etching primer.
• These findings suggest potential clinical advantages for self-adhesive cements in preventing microleakage.