The relationship between dentin bond strengths and dentin permeability

Area of Science:

• Dental Materials Science
• Adhesive Dentistry
• Biomaterials Research

Background:

• Dentin permeability influences the success of dental restorations.
• Understanding the smear layer's role in bonding is crucial for predictable clinical outcomes.

Purpose of the Study:

• To investigate the relationship between dentin permeability and the shear bond strength of Scotchbond/Silux.
• To determine how smear layer removal affects this relationship.

Main Methods:

• Investigated dentin permeability and shear bond strength of Scotchbond/Silux.
• Manipulated the smear layer using abrasive paper, dental burs, and acid-etching.
• Measured changes in dentin permeability before and after bonding procedures.

Main Results:

• No correlation between dentin permeability and bond strength with an intact smear layer.
• Inverse relationship observed after acid-etching: lower permeability correlated with higher bond strength.
• Smear layer creation reduced permeability by 80-85%; acid-etching increased permeability.

Conclusions:

• The smear layer's presence or absence significantly alters the relationship between dentin permeability and bond strength.
• Acid-etching, while necessary for bonding, increases dentin permeability, potentially impacting long-term seal.
• Optimizing smear layer management is key for enhancing the reliability of dental adhesive systems like Scotchbond/Silux.