Thermo-mechanical evaluation of light-cured dental composites
Keywords:
light-cured dental composites; aerosil OX50; nanofiller; glass transition temperature.Abstract
The aim of this study was to evaluate the thermo-mechanical properties of six light-cured
dental composites, prepared using aerosil OX50 as inorganic filler and two matrices: Bis-
GMA/tetraethyleneglycol dimethacrylate/-methacryloxypropyltrimethoxysilane and Bis-
GMA/triethyleneglycol dimethacrylate/-methacryloxypropyltrimethoxysilane. The initiator
system was based on the camphorquinone /N, N-dimethylaminoethyl methacrylate pair. The
filler was characterized by Infrared Spectroscopy to Fourier Transform, X-ray Diffraction and
Scanning Electron Microscopy. Dental composites were evaluated by Thermogravimetric
Analysis and Dynamic Mechanical Analysis. It was confirmed that aerosil OX50 is an
amorphous silicon dioxide, formed by spherical particles of nanometric size. Composites are
thermally stable up to 300 °C, which is suitable for their application. Three of the
experimental composites have adequate modulus of elasticity and glass transition
temperatures, both parameters being slightly higher than those of the Tetric Ceram ®
commercial composite used as reference. Considering the results obtained, it is possible to use
tetraethyleneglycol and triethyleneglycol dimethacrylates in the preparation of experimental
dental composites.
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Copyright (c) 2022 Oridayma Tarano-Artigas , Juan Valerio Cauich-Rodriguez, José Manuel Cervantes-Uc, Lucien Veleva-Muleshkova , Yaymarilis Veranes-Pantoja
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