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Effect Of Alumina Reinforcing Fillers In BisGMA-based Resin Composites For Dental Applications

Sanjay Thorat, Alberto Diaspro, Marco Salerino

Volume 4, Issue 1, Page 15-21, Year 2013, 'ICNANO 2011' | DOI: 10.5185/amlett.2013.icnano.283

Keywords: Dental restorative composites; inorganic fillers; dynamic mechanical analysis; nanoindentation; elastic modulus.

Abstract: 

A photo‑polymerizable resin based on bisphenol‑A‑glycidyldimethacrylate monomer was loaded at both 10 and 50% by weight with particles of alumina of size scales in the 10 micrometers and submicrometer order, termed micro‑alumina and nano‑alumina, respectively.  After curing, the viscoelastic properties of these materials were characterized by multifrequency dynamic mechanical analysis at 0.1, 1 and 10 Hz, carried out in bending mode under strain control across the range of temperatures of 2 to 62°C, normally occurring in the mouth.  The storage moduli close to body temperature (37°C) and mastication frequency (1 Hz) was evaluated as the main result of the analysis, along with its change on frequency.  The stiffest composite was the 50%wt loaded nano‑alumina, which reached a modulus of ~6.8 GPa, comparable to those of commercial restorative composites, even in the absence of bonding agent coating of the fillers.  The storage moduli at the same frequency but room temperature (25°C) were compared with the elastic modulus resulting from atomic force microscopy nanoindentation.  These measurements confirmed the same ranking of materials as the dynamic flexural analysis, while providing elastic modulus values ~50% higher on average.  From the dynamic analysis no thermal transition was observed in the considered temperature range, and a stiffening effect appeared at higher frequencies for all the composites. Copyright © 2013 VBRI press.

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