Alternative adhesive strategies to optimize bonding to radicular dentin

Area of Science:

• Dental Materials Science
• Endodontics
• Adhesive Dentistry

Background:

• Radicular dentin bonding is crucial for endodontic filling material success.
• Polymerization stresses can negatively impact the bond strength of dental adhesives.
• Optimizing dentin bonding procedures is essential for long-term restoration stability.

Purpose of the Study:

• To evaluate the hypothesis that an indirect dentin bonding procedure with an acrylic core material can optimize bond strengths.
• To compare the bond strengths of different endodontic filling materials using direct and indirect bonding techniques.

Main Methods:

• Human teeth roots were endodontically prepared and obturated with EndoREZ, Epiphany, or acrylic points with SE Bond.
• Direct and indirect bonding techniques were employed.
• Bond strengths were measured using a thin slice push-out test.

Main Results:

• EndoREZ and Epiphany showed push-out strengths below 5 MPa.
• Direct bonding with acrylic points and SE Bond achieved 10 MPa.
• The indirect bonding technique increased push-out strengths to 18 MPa.

Conclusions:

• The indirect bonding protocol with an acrylic point effectively compensates for polymerization stresses.
• This technique offers a viable method for optimizing bond strengths of endodontic filling materials to radicular dentin.
• Indirect bonding presents a promising approach for improving the longevity of endodontic restorations.