News Column

Findings from Case Western Reserve University in Fullerenes Reported

May 30, 2014

By a News Reporter-Staff News Editor at Health & Medicine Week -- Investigators publish new report on Fullerenes. According to news originating from Cleveland, Ohio, by NewsRx correspondents, research stated, "Statement of problem. Most fractures of dentures occur during function, primarily because of the flexural fatigue of denture resins."

Our news journalists obtained a quote from the research from Case Western Reserve University, "The purpose of this study was to evaluate a polymethyl methacrylate denture base material modified with multiwalled carbon nanotubes in terms of fatigue resistance, flexural strength, and resilience. Denture resin specimens were fabricated: control, 0.5 wt%, 1 wt%, and 2 wt% of multiwalled carbon nanotubes. Multiwalled carbon nanotubes were dispersed by sonication. Thermogravimetric analysis was used to determine quantitative dispersions of multiwalled carbon nanotubes in polymethyl methacrylate. Raman spectroscopic analyses were used to evaluate interfacial reactions between the multiwalled carbon nanotubes and the polymethyl methacrylate matrix. Groups with and without multiwalled carbon nanotubes were subjected to a 3-point-bending test for flexural strength. Resilience was derived from a stress and/or strain curve. Fatigue resistance was conducted by a 4-point bending test. Fractured surfaces were analyzed by scanning electron microscopy. One-way ANOVA and the Duncan tests were used to identify any statistical differences (alpha=.05). Thermogravimetric analysis verified the accurate amounts of multiwalled carbon nanotubes dispersed in the polymethyl methacrylate resin. Raman spectroscopy showed an interfacial reaction between the multiwalled carbon nanotubes and the polymethyl methacrylate matrix. Statistical analyses revealed significant differences in static and dynamic loadings among the groups. The worst mechanical properties were in the 2 wt% multiwalled carbon nanotubes (P <.05), and 0.5 wt% and 1 wt% multiwalled carbon nanotubes significantly improved flexural strength and resilience. All multiwalled carbon nanotubes-polymethyl methacrylate groups showed poor fatigue resistance. The scanning electron microscopy results indicated more agglomerations in the 2% multiwalled carbon nanotubes. Multiwalled carbon nanotubes-polymethyl methacrylate groups (0.5% and 1%) performed better than the control group during the static flexural test. The results indicated that 2 wt% multiwalled carbon nanotubes were not beneficial because of the inadequate dispersion of multiwalled carbon nanotubes in the polymethyl methacrylate matrix. Scanning electron microscopy analysis showed agglomerations on the fracture surface of 2 wt% multiwalled carbon nanotubes."

According to the news editors, the research concluded: "The interfacial bonding between multiwalled carbon nanotubes and polymethyl methacrylate was weak based on the Raman data and dynamic loading results."

For more information on this research see: Characterization Of Multiwalled Carbon Nanotube-polymethyl Methacrylate Composite Resins As Denture Base Materials. Journal of Prosthetic Dentistry, 2014;111(4):318-326. Journal of Prosthetic Dentistry can be contacted at: Mosby-Elsevier, 360 Park Avenue South, New York, NY 10010-1710, USA. (Elsevier -; Journal of Prosthetic Dentistry -

The news correspondents report that additional information may be obtained from R. Wang, Case Western Reserve University, Sch Engn, Cleveland, OH 44106, United States. Additional authors for this research include J.L. Tao, B. Yu and L.M. Dai (see also Fullerenes).

Keywords for this news article include: Ohio, Cleveland, Fullerenes, United States, Nanotechnology, Carboxylic Acids, Methylmethacrylates, Emerging Technologies, Polymethyl Methacrylate, North and Central America, Multiwalled Carbon Nanotube

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Source: Health & Medicine Week

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