Bond strength of multi-step and simplified-step systems

Area of Science:

• Dental Materials Science
• Adhesive Dentistry
• Biomaterials Engineering

Background:

• Dentin bonding systems are crucial for the longevity of dental restorations.
• Comparing multi-step and simplified-step systems is essential for clinical decision-making.
• Understanding the in vitro shear bond strength (SBS) provides insights into material performance.

Purpose of the Study:

• To compare the in vitro shear bond strength (SBS) of three pairs of multi-step and simplified-step dentin bonding systems.
• Specifically evaluate OptiBond vs. OptiBond FL, All-Bond 2 vs. One-Step, and Tenure vs. Tenure Quik.
• Determine if simplified-step systems can match or exceed the performance of their multi-step counterparts.

Main Methods:

• 60 human mandibular molars were prepared to expose dentin surfaces.
• Dentin surfaces were treated with six different bonding systems (three pairs).
• Resin composite cylinders were bonded, followed by storage and thermocycling before shear testing.

Main Results:

• All-Bond 2 and OptiBond FL exhibited significantly higher shear bond strength than their respective simplified-step counterparts (p < 0.05).
• The Tenure/Tenure Quik pair did not show a statistically significant difference.
• OptiBond FL was the only simplified-step system that demonstrated improved bond strength.

Conclusions:

• Simplified-step dentin bonding systems, such as OptiBond FL and All-Bond 2, can achieve high in vitro shear bond strength.
• OptiBond FL represents an advancement in simplified-step dentin bonding technology.
• Further clinical studies are warranted to confirm these findings in vivo.