Morphologic aspects of the resin-dentin interdiffusion zone with five different dentin adhesive systems tested in...

Area of Science:

• Dentistry
• Biomaterials Science
• Dental Adhesion

Background:

• Enamel dentin adhesives create a hybrid layer for improved adhesion.
• Hybrid layer formation is well-documented in vitro but less so in vivo.
• This layer enhances bonding between tooth substrates and adhesive resins.

Purpose of the Study:

• To investigate in vivo hybrid layer formation with five distinct enamel dentin adhesive systems.
• To compare the morphology of hybrid layers and resin tags across different adhesive systems.
• To assess the clinical relevance of in vitro findings on hybrid layer development.

Main Methods:

• Five different enamel dentin adhesive systems were applied to flat dentin preparations in periodontally compromised teeth.
• Teeth were extracted immediately after resin curing.
• Scanning electron microscopy (SEM) was used to visualize hybrid layer formation and resin tag morphology.

Main Results:

• All five tested adhesive systems successfully formed a hybrid layer in vivo.
• Characteristic reverse cone-shaped resin tags were observed with Gluma 2000, Scotchbond Multipurpose, All Bond 2, and Super Bond D Liner.
• Clearfil Liner Bond produced narrower resin tags at tubule apertures compared to other systems.
• Observed hybrid layer and resin tag morphology closely resembled in vitro findings.

Conclusions:

• The study validates the in vivo efficacy of tested enamel dentin adhesive systems in forming a hybrid layer.
• In vivo hybrid layer morphology is comparable to in vitro observations, supporting the predictive value of laboratory studies.
• These findings reinforce the importance of the hybrid layer for achieving durable dental restorations.