Browsing by Autor "Paulo G. Coelho"

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    Micro-computed tomography evaluation of volumetric polymerization shrinkage and degree of conversion of composites cured by various light power outputs
    (Japanese Society for Dental Materials and Devices, 2017) Pablo J. Atria; Camila S. Sampaio; Eduardo Cáceres; Jessica Fernández; André Figueiredo Reis; Marcelo Giannini; Paulo G. Coelho; Ronaldo Hirata
    This study evaluated the influence of different light-curing modes on the volumetric polymerization shrinkage and degree of conversion of a composite resin at different locations using micro-computed tomography and Fourier transform infrared spectroscopy (FTIR). Specimens were divided into 4 groups based on the light-curing mode used (Bluephase 20i): 1 -High (1,200 mW/cm<sup>2</sup>); 2 -Low (650 mW/cm<sup>2</sup>); 3 -Soft-start (650-1,200 mW/cm<sup>2</sup>); and 4 -Turbo (2,000 mW/cm<sup>2</sup>). Degree of conversion was calculated by the measurement of the peak absorbance height of the uncured and cured materials at the specific wavenumbers, and was performed by FTIR 48 h after curing resin samples. Degree of conversion was analyzed using two-way ANOVA. No significant differences were observed independent of the region of the restoration investigated (p>0.05). Different curing modes did not influence volumetric shrinkage neither degree of conversion of class I composite resin restorations.