Study of theconversion degree of photo-cured resin composites by FTIR spectroscopy

Lívia Maluf Menegazzo, José Carlos Barbosa, João Carlos Silos Moraes

Abstract


The purpose of this study was to evaluate the degree of conversion of three photo-cured composite resins (Fill Magic, TPH Spectrum and Te-Econom). One hundred and twenty samples were prepared, which were irradiated for 20 and 40 s using four light units (two halogens and two LEDs) of different power densities. The degree of conversion was evaluated from near infrared absorption data obtained in a Fourier transform infrared spectrometer. The results show that the degree of conversion increases with the irradiation time only when the resins were radiated with light units of power density smaller than 233 mW/cm2. All three composite resins achieved levels of conversion within the range typically observed in commercial light-cured resins.

Keywords


Grau de conversão; Compósitos fotoativados; Espectroscopia no infravermelho



DOI: http://dx.doi.org/10.18363/rbo.v67n1.p.24

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