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Oral Health & Preventive Dentistry



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Oral Health Prev Dent 15 (2017), No. 3     7. July 2017
Oral Health Prev Dent 15 (2017), No. 3  (07.07.2017)

Page 245-250, doi:10.3290/j.ohpd.a38525, PubMed:28674704

Antibacterial Orthodontic Adhesive Incorporating Polyethyleneimine Nanoparticles
Zaltsman, Nathan / Kesler Shvero, Dana / Polak, David / Weiss, Ervin I. / Beyth, Nurit
Purpose: To evaluate the antibacterial, mechanical and biocompatibility characteristics of an orthodontic adhesive that contains quaternary ammonium polyethyleneimine (QPEI) nanoparticles.
Materials and Methods: QPEI nanoparticles were added to an orthodontic adhesive at 0%, 1% and 1.5% wt/wt. Antibacterial activity was tested after aging for 14 days using the direct contact test (DCT). The degree of monomer conversion (DC) was measured using Fourier transform infrared (FTIR) spectroscopy. Shear bond atrength (SBS) was tested on the etched enamel of extracted human teeth. Biocompatibility was tested using keratinocyte and neutrophil cell lines in the XTT assay.
Results: The DCT results showed significant bacterial growth inhibition in the test group incorporating 1.5% wt/wt QPEI nanoparticles (p < 0.05). The DC of the 0%, 1%, and 1.5% wt/wt samples measured immediately and after 10 min was 62.2-71.0%, 59.1-68.7%, and 52.9-58.6%, respectively, and the average SBS were 9.25 MPa, 11.57 MPa, and 9.10 MPa, respectively. Keratinocyte and neutrophil viability did not change following the addition of QPEI to the orthodontic adhesives.
Conclusions: The incorporation of QPEI nanoparticles into orthodontic cement provides long-lasting antibacterial activity against Streptococcus mutans without reducing the strength of adhesion to enamel, the degree of double bond conversion during the polymerisation, or the biocompatibility of the orthodontic cement.

Keywords: antibacterial nanoparticles, orthodontic adhesive, shear bond strength