Dentin bond strength of Dyract Cem

Area of Science:

• Dental Materials Science
• Adhesion Science
• Biomaterials Engineering

Background:

• Provisional cements are crucial for temporary restorations.
• Understanding their interaction with dentin bonding agents is essential for clinical success.
• Self-curing polyacid-modified resin composites offer aesthetic and handling advantages.

Purpose of the Study:

• To evaluate how provisional cements and a dentin bonding agent influence the adhesion of Dyract Cem.
• To assess the bond strength of Dyract Cem on pressurized human dentin under various surface treatments.

Main Methods:

• Human dentin specimens were treated with Dyract Cem, provisional cements (Freegenol, Temp Bond), and a dentin bonding agent (Prime & Bond 2.0) in different sequences.
• Specimens underwent 1,500 thermal cycles simulating intra-pulpal pressure.
• Shear bond strengths were measured and statistically analyzed.

Main Results:

• The combination of Prime & Bond 2.0 with Freegenol or Temp Bond significantly enhanced Dyract Cem adhesion.
• Dual application of Prime & Bond 2.0 with intermediate provisional cement treatment resulted in the highest shear bond strength (5.84 MPa).
• Single use of Prime & Bond 2.0 with prior TempBond application showed the lowest mean shear bond strength (0.27 MPa).

Conclusions:

• Dentin surface treatment with provisional cements and a dentin bonding agent significantly impacts the adhesion of polyacid-modified resin composites.
• Optimizing the application sequence and employing dual bonding strategies can substantially improve bond strength.
• These findings have implications for the selection and application of materials in temporary dental restorations.