Abstract
The antibacterial activity of quaternary ammonium polyethylenimine (PEI) nanoparticles embedded at 1% w/w with clinically used bonding, flowable and hybrid dental composite resins and cured by light polymerization was studied. The antibacterial activity was tested with Streptoccocus mutans by: (i) the agar diffusion test (ADT); (ii) the direct contact test; (iii) bacterial growth in the materials elute; (iv) and scanning electron microscope (SEM). Using the direct contact test, antibacterial activity (p<0.001) was found in all three types of composite resins incorporated with the synthesized nanoparticles. The effect lasted for at least 1 month. SEM demonstrated bacterial debris and no streptococcal chains at 24 h of bacterial contact. The addition of 1% w/w of nanoparticles did not affect the flexural modulus and the flexural strength of the dental composite materials.The results indicate that quaternary ammonium PEI nanoparticles immobilized in resin-based materials have a strong antibacterial activity upon contact without leach-out of the nanoparticles and without compromise in mechanical properties.
Original language | English |
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Pages (from-to) | 3995-4002 |
Number of pages | 8 |
Journal | Biomaterials |
Volume | 27 |
Issue number | 21 |
DOIs | |
State | Published - Jul 2006 |
Keywords
- Antibacterial
- Dental composite
- Nanoparticles
- Polyethylenimine
- Quaternary ammonium