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Effects of Various Resin Composite (Co)monomers and Extracts on Two Caries-associated Micro-organisms in vitro
C. Hansel
Department of Conservative Dentistry and Periodontology
G. Leyhausen
Department of Conservative Dentistry and Periodontology
U.E.H. Mai
Institute for Medical Microbiology, Medical University Hannover, 30623 Hannover, Germany
W. Geurtsen
Department of Conservative Dentistry and Periodontology
Previous studies have shown that extracts of various filling materials, e.g., resin composites, may influence the growth of cariogenic micro-organisms. The purpose of this study was to examine the effects of important resin composite (co)monomers (Bis-GMA, UDMA, TEGDMA, EGDMA) and extracts of two commercial dental composites with similar composition (composite A, ArabeskTM; composite S, SuperluxTM) on the growth of the two cariogenic bacterial pathogens Streptococcus sobrinus and Lactobacillus acidophilus. It was found that neither the monomers Bis-GMA and UDMA, nor the comonomer EGDMA, nor the extract of composite A influenced the growth of S. sobrinus in the log phase. The comonomer TEGDMA and the extract of composite S were found to stimulate growth in the log phase, but this stimulation was not statistically significant. However, EGDMA, TEGDMA, and the extract of composite S did stimulate the total growth of S. sobrinus. In the assays with L. acidophilus, Bis-GMA, UDMA, and the extract of composite A inhibited the growth in the log phase, whereas TEGDMA stimulated it. Furthermore, EGDMA, TEGDMA, and the extract of composite S stimulated the biomass production of L. acidophilus. We conclude from our results that a release of EGDMA and TEGDMA from resin composites should be avoided due to their growth-stimulating effects on the caries-associated micro-organisms S. sobrinus and L. acidophilus.
Key Words: dental composites • residual monomers • Streptococcus sobrinus • Lactobacillus acidophilus • microbial effects.
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Journal of Dental Research, Vol. 77, No. 1,
60-67 (1998)
DOI: 10.1177/00220345980770010601
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