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|Type:||Artigo de periódico|
|Title:||Ftir Studies On The Effect Of Network Connectivity In The Cement Forming Ability Of Sol-gel Glasses In The Sio2-al2o3-cao-caf2 System|
|Abstract:||The first studies on the cement forming ability of the glasses employed in the formulation of useful glass-ionomer cements attributed a crucial role to the Al2O3/SiO2 ratio, which was required to be higher than 1/2 by mass for cement formation. More recently, the use of the concepts such as network connectivity or crosslink density to formulate glass compositions with a good cement-forming ability has been proposed in the literature. In the present work, the effect of network connectivity on the cement-formation ability of high purity, homogeneous sol-gel glasses of different compositions in the SiO2-Al2O3-CaO-CaF2 system was qualitatively evaluated by FTIR spectroscopy. The cement-forming ability of the calcined sol-gel glasses was assessed at different powder/liquid ratios by determining their setting behaviour according to the procedure described in the ISO 9917 - Dental water-based cements. The network connectivities of the calcined sol-gel glasses were qualitatively evaluated by Fourier transform infrared (FTIR) spectroscopy. The analysis of the FTIR spectra provided useful qualitative information on the network connectivity of the sol-gel glasses, which proved to be more efficient than the Al2O3/SiO2 ratio as a way of evaluating and predicting the reactivity, and hence, the cement forming ability of these glasses.|
|Editor:||Trans Tech Publ, Uetikon-Zuerich, Switzerland|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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