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We have developed andstudied a novel high-strength glass-ionomer cement system composed ofpolyacrylic acid with different molecular architectures. These polyacrylicacid polymers were synthesized via ATRP technique. The effects of arm numberand branching on reaction kinetics, viscosity, and mechanical strengths of theformed polymers and cements were evaluated. The results showed that unlike thestar-shaped polymer synthesis both hyperbranched and star-hyperbranched polymers syntheses proceed slowly at theearly stage but accelerate at the later stage. The higher the arm number andinitiator concentration are, the faster the ATRPreaction was. It was also found that the higher the arm number and branchingthat the polymer had, the lower the viscosity of the polymer aqueous solution is and the lower the mechanical strengths of the formedcement are. The mechanicalstrengths of three synthesized polymers-composed experimental cements were verysimilar to each other but much higher than those of Fuji II LC. Theexperimental cements were 31% - 53%in CS, 37% - 55%in compressive modulus, 80% - 126%in DTS, 76% - 94% in FS, 4% - 21% in FT and 53% - 96% in KHN higher thanFuji II LC. For wear test, the experimental cements were only 5.4% - 13% of abrasive and 6.4% - 12% of attritional weardepths of Fuji II LC in each wear cycle. The one-month aging study also showed thatall the experimental cements increased their CS continuously during 30 days,unlike Fuji II LC.

KEYWORDS

Polyacrylic acid; Molecular Architecture; Glass-Ionomer Cement; Atom-Transfer Radical Polymerization; Mechanical Strength

Cite this paper

Xie, D. , Zhao, J. and Weng, Y. 2014 A High-Strength Cement System for Improved Dental Restoratives. Journal of Materials Science and Chemical Engineering, 2, 1-15. doi: 10.4236-msce.2014.23001.





Autor: Dong Xie, Jun Zhao, Yiming Weng

Fuente: http://www.scirp.org/



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