Journal
JOURNAL OF DENTAL RESEARCH
Volume 91, Issue 2, Pages 179-184Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/0022034511426573
Keywords
adhesives; polymers; restorative dentistry; materials science(s); water; nanoparticles
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Funding
- NIH/NIDCR [1RC1-DE020480]
- CAPES/Brazil [4511/07-7]
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Current challenges in adhesive dentistry include over-hydrophilic bonding formulations, which facilitate water percolation through the hybrid layer and result in unreliable bonded interfaces. This study introduces nanogel-modified adhesives as a way to control the material's hydrophobic character without changing the basic monomer formulation (keeping water-chasing capacity and operatory techniques unaltered). Nanogel additives of varied hydrophobicity were synthesized in solution, rendering 10- to 100-nm-sized particles. A model BisGMA/HEMA solvated adhesive was prepared (control), to which reactive nanogels were added. The increase in adhesive viscosity did not impair solvent removal by air-thinning. The degree of conversion in the adhesive was similar between control and nanogel-modified materials, while the bulk dry and, particularly, the wet mechanical properties were significantly improved through nanogel-based network reinforcement and reduced water solubility. As preliminary validation of this approach, short-term micro-tensile bond strengths to acid-etched and primed dentin were significantly enhanced by nanogel inclusion in the adhesive resins.
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