Antibacterial effect of polyethyleneimine nanoparticles incorporated in provisional cements against Streptococcus mutans.

Background: Frequently provisional restorations require long-term permanence in the oral cavity, thus an antibacterial effect is desirable. We hypothesized that this effect may be achieved by incorporating polyethyleneimine (PEI) nanoparticles into provisional cements.

Methods: The nanoparticles antibacterial effect incorporated at 0.