Subsequent application of bonding agents to a one-step self-etch adhesive - Its effect with/without previous...

Area of Science:

• Dental Materials Science
• Adhesive Dentistry
• Biomaterials

Background:

• One-step self-etch adhesives (1-SEA) simplify dental procedures.
• The interaction between 1-SEA and subsequent bonding agents (BA) can influence bond durability.
• Investigating pre-curing strategies for 1-SEA is crucial for optimizing adhesion to dentin.

Purpose of the Study:

• To evaluate the effect of light-curing a 1-SEA prior to applying different BAs on micro-tensile bond strength (μTBS) to dentin.
• To assess the influence of thermal cycling on the bond strength.
• To determine the degree of conversion of the adhesive system.

Main Methods:

• Three ion-releasing BAs (BZF-21, Clearfil SE Protect, FL-Bond II) were applied over G-Premio Bond (GPB, 1-SEA), with GPB either light-cured or uncured.
• Micro-tensile bond strength (μTBS) was tested after 24h and after 15,000 thermal cycles (TC).
• Fourier-transform infrared spectroscopy (FTIR) was used to evaluate the degree of conversion.

Main Results:

• μTBS significantly increased with BZF-21 and Clearfil SE Protect (CSP) when GPB remained uncured, both at 24h and after TC.
• Light-cured CSP also showed improved μTBS after TC.
• FL-Bond II did not significantly alter GPB's μTBS compared to the control.

Conclusions:

• Ion-releasing bonding agents BZF-21 and CSP enhance the μTBS of G-Premio Bond to dentin.
• Optimal bond strength is achieved when G-Premio Bond is not light-cured prior to the application of these bonding agents.
• The findings suggest a beneficial interaction between specific ion-releasing BAs and uncured 1-SEA for improved dentin adhesion.