Release of Interface Confined Water Significantly Improves Dentin Bonding

Abstract

Water residue and replacement difficulty cause insufficient adhesive infiltration in demineralized dentin matrix (DDM), which produces a defective hybrid layer and thus a bonding durability problem, severely plaguing adhesive dentistry for decades. In this study, we propose that the unique properties of a highly hydrated interface of the porous DDM can give rise to 1 new type of interface, confined liquid water, which accounts for most of the residue water and may be the main cause of insufficient infiltration. To prove our hypothesis, 3 metal ions with increasing binding affinity and complex stability (Na+, Ca2+, and Cu2+) were introduced respectively to coordinate negatively charged groups such as -PO43−, -COO− abundant in the DDM interface. Strong chelation of Ca2+ and Cu2+ rapidly released the confined water, significantly improving penetration of hydrophobic adhesive monomers, while Na+ had little effect. A significant decrease of defects in the hybrid layer and a much decreased modulus gap between the hybrid layer and the adhesive layer greatly optimized the microstructure and micromechanical properties of the tooth–resin bonding interface, thus improving the effectiveness and durability of dentin bonding substantially. This study paves the way for a solution to the core scientific issue of contemporary adhesive dentistry: water residue and replacement in dentin bonding, both theoretically and practically.

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“…The bonding strategy based on the rapid dehydration reconstruction of the hydrated interface can remove the confined water, significantly improve adhesive infiltration and thus allow for the construction of a defect-low hybrid layer or even antibacterial defect-low hybrid layer. 23–26 These reports suggest that the hydrated DDM interface may play the most prominent role in dentin bonding. It is not only the root cause of unsatisfactory bonding effects that result in current massive clinical issues, but may also be key to solving many problems associated with clinical bonding practices.…”