Laboratory evaluation of the XR-Bond Dentin/Enamel Bonding System

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Adhesive Dentistry

Background:

• Dental bonding systems are crucial for composite restoration longevity.
• Assessing the long-term stability of bond strength and microleakage is essential for clinical success.
• The XR-Bonding System's performance with Herculite composite requires thorough evaluation.

Purpose of the Study:

• To determine the shear bond strength of the XR-Bonding System with Herculite composite to dentin over time.
• To evaluate the quantitative microleakage of Class V preparations restored with the XR-Bonding System.
• To assess the influence of storage duration in physiological saline on bond strength and microleakage.

Main Methods:

• Shear bond strength testing of bonded composite cylinders to human molars.
• Storage of specimens in physiological saline at 37°C for up to four weeks.
• Quantitative microleakage assessment using a spectrophotometric dye-recovery method after thermocycling.

Main Results:

• Shear bond strengths showed a significant increasing trend with storage duration (p = 0.01).
• Quantitative microleakage measurements were not significantly different across storage intervals (p = 0.75).
• The XR-Bonding System demonstrated stable marginal integrity despite increasing bond strength.

Conclusions:

• The XR-Bonding System exhibits increasing shear bond strength to dentin over a four-week period.
• The system provides durable marginal seal, with no significant increase in microleakage observed over time.
• These findings suggest the XR-Bonding System offers reliable performance for dentin bonding in dental restorations.