Failed bonded interfaces submitted to microcosm biofilm caries development.

Area of Science:

• Dental Materials Science
• Cariology
• Restorative Dentistry

Background:

• Composite-dentin interfaces are susceptible to secondary caries.
• Understanding factors influencing wall lesion development is crucial for restorative success.

Purpose of the Study:

• To evaluate dentin wall carious lesion development at different composite-dentin interfaces.
• To assess the role of adhesive bonding materials in preventing caries in gap defects.

Main Methods:

• A microcosm biofilm model was used to induce caries-like wall lesions.
• Specimens with controlled gaps (200μm) were prepared using etch-and-rinse and self-etch adhesives.
• Mechanical properties and lesion progression (depth, mineral loss) were analyzed using microradiography.

Main Results:

• Adhesive material presence in gaps significantly reduced lesion development.
• Mechanical aging of interfaces increased caries development.
• No significant difference was observed between etch-and-rinse and self-etch adhesive systems.

Conclusions:

• Composite-dentin interface integrity, particularly the presence of adhesive material, is critical in preventing wall caries.
• Mechanical aging compromises the protective effect of the interface against caries progression.