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Abstracts 21

1. Effects of Amine Fluoride on Biofilm Growth and Salivary Pellicles 2. alternative to bisphophonates currently being used in treating and preventing osteoporosis Effects of Amine Fluoride on Biofilm Growth and Salivary Pellicles H.C. van der Mei, E. Engels, J. de Vries, H.J. Busscher The amine fluoride (AmF) N'-octadecyltrimethylendiamine-N,N,N'-tris (2-ethanol)-dihydrofluoride is a cationic antimicrobial which can have beneficial effects on plaque formation. Here, we determine changes in pellicle and bacterial cell surface properties of the strains Actinomyces naeslundii HM1, Streptococcus mutans NS, S.mutans ATCC 700610, S. sobrinus HG1025 and S. oralis HM1 upon adsorption of this AmF and accompanying effects on bacterial adhesion and biofilm growth. In vitro pellicles had a zeta potential of -12 mV that became less negative upon adsorption of AmF. The chemical functionalities in which carbon and oxygen were involved changed after AmF adsorption and AmF-treated pellicles had a greater surface roughness than untreated pellicles. Water contact angles in vitro decreased from 56 to 45 upon AmF treatment, which corresponded with water contact angles (44) measured intraorally on the front incisors of volunteers immediately after using an AmF- containing toothpaste. All bacterial strains were negatively charged and their isoelectric points (IEP) increased upon AmF adsorption. Minimal inhibitory concentrations were smallest for strains exhibiting the largest increase in IEP. Adhesion to salivary pellicles and biofilm growth of the mutans streptococcal strains were significantly reduced after AmF treatment, but not of A. naeslundii or S. oralis. However, regardless of the strain involved, biofilm viability decreased significantly after AmF treatment. The electrostatic interaction between cationic AmF and negatively charged bacterial cell surfaces is pivotal in establishing reduced biofilm formation by AmF through a combination of effects on initial adhesion and killing. The major effect of AmF treatment, however, was a reduction brought about in biofilm viability. Caries Res 2008;42:19-27 A new study by researchers at the University of Southern California (USC) School of Dentistry indicates that aspirin offers a potential alternative to bisphophonates currently being used in treating and preventing osteoporosis In their mouse study, an aspirin regimen appeared to help the mice recover from osteoporosis, according to Songtao Shi, D.D.S., Ph.D., and Takayoshi Yamaza, D.D.S., Ph.D., of the USC School of Dentistry's Center for Craniofacial Molecular Biology. They found that the drug seemed to prevent both improper bone resorption and the death of bone-forming stem cells. An aspirin regimen has been linked in earlier epidemiological studies to better bone mineral density, but the mechanisms of its interactions in regards to bone health had not yet been studied extensively, Shi said. The study appears in PLoS One (July 9, 2008, 3(7): e2615).
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