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Dentinal adhesive with composite restorations: a clinical and microstructural evaluation

G Goracci¹, G Mori, M Bazzucchi

¹Department of Operative Dentistry, University of Rome, "La Sapienza", Italy.

The International Journal of Prosthodontics

|November 1, 1995

Summary

New dental bonding agents effectively seal dentinal tubules by penetrating etched dentin. This creates a hybrid layer, significantly reducing microleakage and associated issues like tooth sensitivity and secondary decay.

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Area of Science:

Dental Materials Science
Biomaterials Engineering
Restorative Dentistry

Background:

Modern dental adhesives require application to both enamel and dentin.
New bonding agents utilize dentin etching, bifunctional primers, and hydrophilic resins.
Microleakage in dental restorations can lead to postoperative sensitivity and secondary decay.

Purpose of the Study:

To analyze the interaction between dentin and fluid resin using three different bonding agents.
To evaluate the formation of the resin-dentin interdiffusion zone (hybrid layer).
To assess the impact of these bonding agents on reducing microleakage.

Main Methods:

Scanning electron microscopy (SEM) was employed for high-resolution imaging.
The study analyzed the penetration of adhesive monomers into etched dentin.

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Microleakage in resin composite restorations was quantitatively or qualitatively assessed.

Main Results:

Adhesive monomers demonstrated effective penetration into etched dentin.
A distinct resin-dentin interdiffusion zone (hybrid layer) was successfully created.
The bonding agents effectively sealed dentinal tubules, minimizing microleakage.

Conclusions:

The analyzed bonding agents create a robust hybrid layer, enhancing adhesion to dentin.
Effective sealing of dentinal tubules significantly reduces microleakage.
These findings suggest a reduction in postoperative tooth sensitivity, pulpal inflammation, and secondary caries.