Interfacial morphology of self-etching adhesive systems in dentin.

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Adhesive Dentistry

Background:

• Self-etching adhesive systems are widely used in restorative dentistry to bond composite resins to tooth structure.
• Understanding the interfacial morphology is crucial for predicting long-term clinical performance and durability of dental restorations.
• Scanning electron microscopy (SEM) provides high-resolution imaging for detailed analysis of microstructures at the tooth-adhesive interface.

Purpose of the Study:

• To evaluate and compare the interfacial micromorphology of various self-etching dental adhesive systems bonded to human dentin.
• To assess the quality of hybrid layer formation and resin tag penetration using scanning electron microscopy.
• To determine the effectiveness of different self-etching systems in achieving a well-sealed and hybridized interface.

Main Methods:

• Human dentin disks were prepared and subjected to a standardized smear layer creation protocol.
• Five different self-etching systems (AdheSE, Optibond Solo Plus-Self-Etch, Tyrian SPE, Adper Prompt Self-Etch, One-Up Bond F) were applied according to manufacturer instructions.
• Composite resin was applied, light-cured, and specimens were processed for scanning electron microscopy (SEM) observation.

Main Results:

• All tested self-etching systems, except for One-Up Bond F, successfully formed sealed interfaces and hybridized areas to varying degrees.
• One-Up Bond F exhibited gap formation and inadequate hybridization at the dentin interface.
• Optibond Solo Plus-Self-Etch demonstrated a more consistent adhesive interface characterized by thicker hybrid layers, numerous resin tags, and lateral branches.

Conclusions:

• Optibond Solo Plus-Self-Etch yielded the most favorable micromorphological outcome among the evaluated self-etching systems.
• One-Up Bond F failed to produce satisfactory ultrastructural morphology at the dentin-adhesive interface.
• The study highlights significant variations in interfacial adaptation and hybridization among different self-etching adhesive systems.