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Influence of Resin Monomers on Growth of Oral Streptococci

¹ Department of Restorative Dentistry and Endodontology, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka 565-0871, Japan; and
² Department of Oral Biology, The Dental School, University of Newcastle upon Tyne, Framlington Place, Newcastle upon Tyne, NE2 4BW, UK;

View larger version (41K): [in a new window]   Figure 1. The absorbance values and CFU numbers (CFU/mL) of bacterial culture when incubated with various monomers. (A–D) In the presence of TEGDMA or DEGDMA, the absorbance values were significantly greater (p < 0.05) than those of controls in the stationary phase (A, S. sobrinus B13; B, S. sanguis ST3R). However, bacterial numbers were not significantly different from controls or less than controls throughout the incubation period (C, S. sobrinus B13; D, S. sanguis ST3R). (E,F) The absorbance values and bacterial numbers of S. sobrinus B13 incubated with the addition of 1.0, 0.5, 0.1, or 0.01 mg/mL of TEGDMA. Significantly greater absorbance values than in controls were obtained at the concentration of 0.5 mg/mL and over, whereas CFU numbers indicated no significant differences between control and all TEGDMA-added groups. The bar represents the standard deviation of the mean of three replicates.

View larger version (85K): [in a new window]   Figure 2. SEM photographs of S. sobrinus B13 or S. sanguis ST3R after 18 hrs of incubation with 1.0 mg/mL of TEGDMA or without any monomers. (A) S. sobrinus B13 incubated without monomers. (B) S. sobrinus B13 incubated with TEGDMA. (C) S. sanguis ST3R incubated without monomers. (D) S. sanguis ST3R incubated with TEDGMA. Sparse vesicular material was formed around bacterial cells when incubated with TEGDMA (x7500).

View larger version (22K): [in a new window]   Figure 3. FTIR and GC-MS analysis results of the materials formed around bacteria and TEGDMA. (A-D) FTIR spectrum for the material formed around S. sobrinus B13 (A), S. sanguis ST3R (B), TEGDMA-polymer (C), and TEGDMA-monomer (D). (E–H) GC-MS analysis results of the materials formed (E,F), TEGDMA-polymer (G), and TEGDMA-monomer (H).