Adhesion of resin composite core materials to dentin

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Adhesive Dentistry

Background:

• Resin composite core materials and dental adhesives are crucial for indirect restorations.
• Understanding their interactions with dentin is vital for clinical success.
• Polymerization mode and etching techniques significantly influence bond strength.

Purpose of the Study:

• To evaluate the effect of polymerization mode of resin composite core materials and dental adhesives on dentin bond strength.
• To compare the performance of dental adhesives on dentin etched with phosphoric acid versus self-etching primer.

Main Methods:

• Three resin composite core materials (dual-cured, self-cured, light-cured) and two dental adhesives were tested.
• Dentin bonding was performed using phosphoric acid etching and self-etching primer conditions.
• Microtensile bond strengths were measured after storage, and SEM analysis of interfaces was conducted.

Main Results:

• Dual-cured Fluorocore exhibited the highest bond strengths among core materials.
• Significant incompatibility was observed between self-cured Core Paste and Prime & Bond NT.
• Clearfil SE Bond generally showed higher bond strengths than Prime & Bond NT, especially with self-etched dentin.

Conclusions:

• A specific self-cured core material and dual-cured adhesive combination demonstrated incompatibility.
• Most other tested combinations of core materials and adhesives achieved robust in vitro dentin bond strengths.
• Both self-etching and phosphoric acid etching methods were effective for most adhesive-dentin interfaces.