Resumo

TARANO-ARTIGAS, Oridayma et al. Thermo-mechanical evaluation of light-cured dental composites. Rev Cub Quim [online]. 2022, vol.34, n.2, pp. 194-210.  Epub 14-Jun-2022. ISSN 2224-5421.

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.

Palavras-chave : light-cured dental composites; aerosil OX50; nanofiller; glass transition temperature.

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