The world's first wiki where authorship really matters (Nature Genetics, 2008). Due credit and reputation for authors. Imagine a global collaborative knowledge base for original thoughts. Search thousands of articles and collaborate with scientists around the globe.

wikigene or wiki gene protein drug chemical gene disease author authorship tracking collaborative publishing evolutionary knowledge reputation system wiki2.0 global collaboration genes proteins drugs chemicals diseases compound
Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Surface roughness of different dental materials before and after simulated toothbrushing in vitro.

This study measured the effect of toothbrushing with a slurry of toothpaste on different dental materials that have been optimally polished. Specimens (n=8) of 21 dental materials, 16 resin composites, 1 amalgam and 4 ceramic materials, were subjected to 36,000 cycles (approximately five hours) of circular toothbrushing with a force of 1.7 N and a slurry of toothpaste (RDA 75) in a device for simulated toothbrushing. The unpolished enamel and dentin of extracted anterior teeth were used as a control. The mean roughness (Ra) was measured with an optical sensor ( FRT MicroProf) before and after toothbrushing. To compare the roughness of the different materials, ANOVA with a post hoc Tukey B test was applied (p<0.05). Among the resin composites, the hybrid composites showed the greatest increase in mean roughness, while the microfilled composites and the compomer Compoglass F demonstrated the lowest increase. No statistically significant difference in roughness was found before and after simulated toothbrushing for the Amalcap amalgam, Esthet-X resin composite, TPH Spectrum resin composite, d.SIGN ceramic and the experimental ceramic. The other ceramic materials and dentin and enamel specimens showed a statistically significant decrease in mean roughness after simulated toothbrushing. Glazed Empress demonstrated a statistically significant higher initial roughness than polished Empress. For resin composites, no correlation was found between the mean particle size and mean roughness after simulated toothbrushing.[1]

References

 
WikiGenes - Universities