Shear bond strength of partial coverage restorations to dentin

Area of Science:

• Dental Materials Science
• Adhesive Dentistry
• Biomaterials Engineering

Background:

• Bond strength to dentin is often lower than to enamel for partial coverage restorations.
• Predictable bonding to dentin is crucial for the longevity of dental restorations.

Purpose of the Study:

• Compare the dentin bond strength of a total-etch versus a self-etching bonding agent.
• Evaluate the impact of microretention on bond strength to dentin.

Main Methods:

• Two bonding agents (Optibond FL - total-etch, Clearfil SE Bond - self-etch) were tested.
• Ceramic samples were bonded to prepared molar surfaces, with half featuring microretention pits.
• Shear bond tests were conducted, and failure modes analyzed under optical microscopy.

Main Results:

• Both Optibond FL and Clearfil SE Bond demonstrated adequate bond strengths to dentin.
• No statistically significant difference was found between the two adhesive systems.
• Microretention pits significantly reduced bond strength values for both tested adhesives.

Conclusions:

• Optibond FL and Clearfil SE Bond are recommended for bonding ceramic restorations to dentin.
• Creating microretention pits negatively affects the bond strength of these adhesives to dentin.
• Further research may explore alternative methods for enhancing dentin adhesion.