Relationship between bond strength and microleakage measured in the same Class I restorations

Area of Science:

• Dentistry
• Biomaterials Science
• Dental Materials

Background:

• Microleakage and bond strength are critical factors in the longevity of dental restorations.
• Understanding the performance of dentin bonding systems is essential for clinical success.
• Class I cavities present unique challenges for achieving optimal bond strength.

Purpose of the Study:

• To evaluate the relationship between microleakage and tensile bond strength in Class I restorations.
• To compare the performance of dentin bonding systems with and without smear layer interaction.
• To assess the efficacy of a light-cured glass-ionomer cement in Class I cavities.

Main Methods:

• Microleakage was measured using a pressurized fluid filtration method.
• Tensile bond strengths were determined for Class I restorations in extracted human teeth.
• Restorative materials included smear layer-compatible and smear layer-removing dentin bonding systems and a glass-ionomer cement.

Main Results:

• An inverse relationship was observed between dentin bond strength and microleakage for certain materials.
• Tensile bond strengths in three-dimensional Class I cavities were significantly lower than those on flat dentin surfaces.
• Fluid filtration measurement of microleakage did not appear to affect bond strength.

Conclusions:

• Material selection and cavity preparation geometry influence restoration integrity.
• Further research is needed to optimize dentin bonding systems for complex cavity preparations.
• Accurate assessment of microleakage is crucial for predicting restoration durability.