Abstracts of the General Sessions of the Japanese Society for Dental Materials and Devices

In the study was to evaluate the morphological changes of the a new product of the flowable resin eroded surfaces by orange juice and alcohol drinks. The stability of the surface properties of the new flowable resin was confirmed.

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The novel low viscous monomers, which were derivatives of bis-GMA with different skeletal bond, were mixed with various ratios, and viscosity of monomer mixture were measured. The experimental hybrid composite resin were made, and the consistency and mechanical properties of the composites was investigate to be reported.

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It is pointed out that low salivary flow supports the growth of pathogenic microorganisms in oral cavity, which increases the risk of dental caries, periodontal disease, oral candidiasis like oral thrush, and also the aspiration pneumonia. Hence in the present study, the effects of commercial artificial saliva on Candida growth, acid production and biofilm formation were examined in vitro.

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Carbon nanotubes have been shown to affect cell behaviour. But how and why the carbon nanotubes affect potential differentiation of the attached cells have not been largely known. In this study, multiwall carbon nanotubes (MWNTs) and graphite (GP) were pressed as compacts. Higher ability of carbon nanotubes to adsorb proteins, comparing with graphite, was shown. Myoblastic mouse cells (C2C12) were cultured and the cell responses to the two kinds of compacts were compared in vitro. Meanwhile, we used cell culture on the culture plate as a control. During the conventional culture, significantly better cell attachment, proliferation and differentiation of cells on the MWNTs were found. To confirm the hypothesis that the larger amount of protein adsorbed on the carbon nanotubes was crucial for this, we made the compacts adsorb more proteins in culture medium with 50% fetal bovine serum (FBS) before cell culture. With the adsorption of the proteins in advance, the increments of the total-protein/ DNA and ALP/DNA for the MWNTs was respectively as about 11 times and 18 times as the increments of those for GP and the control at both day 4 and day 7. Therefore, the carbon nanotubes might induce cellular functions by adsorbing more proteins, which indicated that the carbon nanotubes might be a candidate for scaffold material for tissue engineering.

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