Adhesive Durability Inside the Root Canal Using Self-adhesive Resin Cements for Luting Fiber Posts.

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Restorative Dentistry

Background:

• Fiber posts are widely used in endodontically treated teeth for coronal restoration.
• The luting agent's bond strength and durability are critical for long-term success.
• Self-adhesive resin cements (SAR) offer simplified clinical application for fiber post cementation.

Purpose of the Study:

• To evaluate the push-out bond strength of different self-adhesive resin cements (SAR) used for luting fiber posts.
• To assess the nanoleakage expression at the luting interface after immediate testing and one-year aging.
• To compare the performance of five commercially available SAR cements.

Main Methods:

• 144 endodontically treated human anterior teeth were used.
• Fiber posts were luted with five SAR cements and one control.
• Specimens underwent thermocycling and one-year humid storage, with bond strength and nanoleakage evaluated at baseline and after aging.

Main Results:

• Bond strength varied significantly among cements (p<0.0005) and root canal locations (p<0.0005), but not with aging (p=0.390).
• Smart Cem (SMC) and RelyX Unicem 2 (RX) showed significantly higher bond strengths than Bifix SE (BF) and Rebilda DC (RB).
• Clearfil SA Cement (CSA) exhibited the lowest bond strength, with increased nanoleakage observed in all groups after aging, particularly for CSA.

Conclusions:

• Self-adhesive resin cements provide reliable bond strengths for luting fiber posts.
• Significant product-specific differences exist in bond strength and degradation resistance.
• Initial degradation effects were observed, highlighting the importance of material selection.