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Fluid flow through dentin-self-etch resin interface during long term in vitro aging.

Mathieu Delannée¹, Geneviève Grégoire, Jean Noël Vergnes

¹Department of Biomaterials, Faculty of Odontology, University Toulouse III, 31062 Toulouse, France.

Materials Science & Engineering. C, Materials for Biological Applications

|August 6, 2013

Summary

The resin-dentin interface permeability initially decreases but slowly increases over two years due to collagen hydrolysis. This degradation of the dental restoration bond is confirmed by fluid flow and infrared spectral changes.

Keywords:

Aging Dentin Fluid filtration Self-etching adhesives

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Area of Science:

Dental Materials Science
Biomaterials Engineering
Polymer Chemistry

Background:

The resin-dentin interface is crucial for the longevity of dental restorations.
Understanding its long-term stability after self-etch adhesive application is essential.
Dentin bonding agents aim to create a durable interface between tooth structure and restorative materials.

Purpose of the Study:

To characterize the long-term stability of the resin-dentin interface after self-etch adhesive application.
To investigate the evolution of fluid flow and spectral changes at the interface over two years.
To evaluate the impact of co-solvents on interface degradation.

Main Methods:

Non-destructive measurement of fluid flow through the dentin-self-etch resin interface over 24 months.
Analysis of infrared spectral changes at the interface.
Comparison of two self-etch adhesive systems with different co-solvents (acetone and t-butanol).

Main Results:

Permeability decreased significantly in the first 3 months for both adhesive systems (-66.9% for iBond, -70.5% for Xeno V).
Fluid flow slowly increased over the subsequent 21 months but remained below 50% of the initial value.
Increased water-related infrared absorption bands (3300 cm⁻¹, 1600 cm⁻¹) indicated interface degradation.

Conclusions:

The resin-dentin interface shows slow degradation over two years, primarily due to collagen hydrolysis.
Co-solvent properties (hydrophobicity, evaporation, viscosity) and resin infiltration influence interface stability.
Fluid flow and spectral analysis are valuable tools for assessing the long-term durability of dentin bonding.