68. Flores-Ramirez, N.; Luna-Barcenas, G.; Vasquez-Garcia, S. R.; Munoz-Saldana, J.; Elizalde-Pena, E. A.; Gupta, R. B.; Sanchez, I. C.; Gonzalez-Hernandez, J.; Garcia-Gaitan, B.; Villasenor-Ortega, F.   Hybrid natural-synthetic chitosan resin: thermal and mechanical behavior.    Journal of Biomaterials Science, Polymer Edition  (2008),  19(2),  259-273.


Poly(Me methacrylate) (PMMA) is one of the most commonly plastics used as dental-base material, due to its good biol. compatibility and mech. properties.  Chitosan has wide application in chem., biochem. and biomedical fields of research.  In this work, chitosan (CTS) was functionalized with glycidyl methacrylate (GMA), to ease a further reaction with MMA.  The resulting co-polymer was finally blended with PMMA and poly(Bu acrylate) PBA which works as a damper, the polymers were cured by UV to obtain the final resin.  Characterization of UV-cured resins was carried out by thermal measurements, x-ray diffraction, at. force microscopy (AFM), micro- and nanoindentation, water absorption and elution in water.  As a result a higher thermal stability of the final resin compared with the precursor co-polymer ((CTS-GMA)-g-PMMA) was obtained.  The resin presented roughness in the nanometer scale and nanoparticles embedded in the acrylic matrix producting a tough material.  However, XRD measurements show that all materials are in an amorphous state.  Values of hardness and elastic modulus results were very near to those of the dentin.  The results of elution in water of the tested resin samples show them as clin. acceptable as a dental base material. 


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