Dentin bond strength of packable composites using one-bottle adhesives

Area of Science:

• Dental Materials Science
• Adhesive Dentistry
• Biomaterials Engineering

Background:

• Packable composites offer handling advantages in direct restorative procedures.
• One-bottle adhesives simplify the bonding protocol, aiming for reliable dentin adhesion.
• Evaluating the bond strength of different composite-adhesive systems is crucial for clinical success.

Purpose of the Study:

• To assess and compare the shear bond strength (SBS) of various packable composite resins to human dentin.
• To evaluate the efficacy of their corresponding one-bottle adhesive systems in achieving durable bonds.

Main Methods:

• Human molars were prepared to expose flat dentin surfaces.
• Five groups of teeth were bonded with different packable composite/one-bottle adhesive systems.
• Samples underwent 24-hour water storage followed by 500 thermal cycles before shear bond strength testing.

Main Results:

• Shear bond strengths (MPa) varied: Group 1 (Solitaire II): 24.39 ± 3.54; Group 2 (Alert): 28.96 ± 4.62; Group 3 (Surefil): 30.77 ± 4.71; Group 4 (Prodigy Condensable): 30.82 ± 3.29; Group 5 (Z250 control): 24.93 ± 5.14.
• Groups 1 and 2 showed significantly lower SBS compared to other groups.
• No significant difference in SBS was found between Groups 2, 3, and 4.

Conclusions:

• The tested one-bottle adhesives exhibited varying performance with packable composites.
• Adhesive systems used with Surefil and Prodigy Condensable, along with Alert, demonstrated superior and comparable shear bond strengths to dentin.
• Clinical selection of packable composites and their bonding agents should consider these performance differences.