News Column

Research from Islamic Azad University Reveals New Findings on Dentistry

June 20, 2014

By a News Reporter-Staff News Editor at Health & Medicine Week -- Investigators publish new report on Dentistry. According to news reporting originating in Tehran, Iran, by NewsRx journalists, research stated, "This study evaluates the effect of incorporation of an acrylate polyhedral oligomeric silsesquioxane nanostructure (APOSS) on the physical and mechanical properties and hydrolytic stability of octyl cyanoacrylate (CA) adhesives. CA was photopolymerized under irradiation of visible light using 1-phenyle-1,2-propandione (PPD), and 2,3-botanedione (BD) as photoinitiators."

The news reporters obtained a quote from the research from Islamic Azad University, "Following the polymerization shrinkage kinetics of the adhesives, the initiator concentration was optimized. Mechanical properties of the bulk CA-APOSS nanocomposites, including flexural strength and modulus, were investigated. Miroshear bond strength of dental composite bonded to human dentin applying the CA-APOSS adhesives was also determined. The effect of APOSS on the stability of CA adhesive against hydrolysis studied performing solubility, water uptake, and aging tests. The results revealed higher efficiency of BD in comparison to PPD. A 3% (mol/mol) of BD was obtained as the optimum photoinitiator concentration. The incorporation of APOSS increased the polymerization shrinkage rate of the CA adhesives. The flexural strength of CA adhesive was significantly improved incorporating less than 20 wt.% APOSS while an increasing trend was observed in the flexural modulus with the nanostructures loading. The microshear bond strength to dentin was also enhanced using 10 wt.% APOSS as reinforcing/crosslinking nanofillers. A decrease in the solubility and water sorption was the result of incorporation of APOSS in CA adhesives. Degradation due to the hydrolysis in water was diminished in the specimens containing APOSS nanostructures, revealed after aging in water at 37C. CA adhesives are good soft tissue adhesives which their low mechanical properties and lack of hydrolytic stability has made them less interesting in the applications deal with hard tissues."

According to the news reporters, the research concluded: "The study shows that the incorporation of POSS nanostructures into CA could reduce the drawbacks."

For more information on this research see: Cyanoacrylate-POSS nanocomposites: novel adhesives with improved properties for dental applications. Dental Materials, 2013;29(6):e61-9. (Elsevier -; Dental Materials -

Our news correspondents report that additional information may be obtained by contacting P. Fadaie, Dept. of Biomedical Engineering, Islamic Azad University, Science and Research Branch, Tehran, Iran. Additional authors for this research include M. Atai, M. Imani, A. Karkhaneh and S. Ghasaban (see also Dentistry).

Keywords for this news article include: Iran, Asia, Tehran, Nitriles, Dentistry, Cyanoacrylates, Nanostructural, Nanostructures, Nanotechnology, Emerging Technologies.

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Source: Health & Medicine Week

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