MAS-NMR spectroscopy studies in the setting reaction of glass ionomer cements

Journal of Dentistry
A StamboulisY Matsuya

Abstract

The main objective is the characterisation of the setting reaction in glass ionomer cements based on experimental ionomer glasses with different fluorine content and a commercial glass ionomer cement liquid by using 13C CP/MAS-NMR, 29Si, 27Al and 31P MAS-NMR spectroscopy in order to receive information specifically about the cross-linking process. Different fluorine containing glass compositions based on 4.5SiO2-3Al2O3-1.5P2O5-(5-z)CaO-zCaF(2) where z=0-3, were mixed with a commercially available polymer liquid to form glass ionomer cements. The cements were subjected to 27Al, 13C CP/MAS, 29Si, and 31P MAS-NMR analysis. The 27Al spectra showed clearly the formation of six-fold coordinate Al(VI), that may crosslink the carboxyl groups in the poly-acid molecules. A shift towards to more positive values of the carboxyl peak in the 13C CP/MAS-NMR spectra showed clearly the proton dissociation of the carboxyl groups. A shift towards more negative values was observed in the 29Si MAS-NMR spectra, suggesting formation of hydrated silica gel and consequently formation of additional Si-O-Si bonds. 31P MAS-NMR spectra also reflected changes in the coordination state around a PO4(3-) tetrahedron. Increasing the fluorine content of the glas...Continue Reading

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Citations

Sep 12, 2014·International Journal of Biomaterials·Muhammad A Fareed, Artemis Stamboulis
Jul 4, 2007·Journal of Materials Science. Materials in Medicine·Xin LinKunio Ishikawa
Jul 31, 2012·Dental Materials : Official Publication of the Academy of Dental Materials·Norhazlin ZainuddinRobert G Hill
Nov 22, 2011·Dental Materials : Official Publication of the Academy of Dental Materials·John W Nicholson, Beata Czarnecka
Jan 2, 2010·Journal of Dentistry·Tais MunhozL H De Almeida
Sep 16, 2008·Dental Materials : Official Publication of the Academy of Dental Materials·Norhazlin ZainuddinRobert V Law
Mar 11, 2015·Scientific Reports·Ana R BenettiHeloisa N Bordallo
Mar 18, 2011·European Journal of Oral Sciences·Jaafar Abduo, Michael Swain
Oct 23, 2016·Dental Materials : Official Publication of the Academy of Dental Materials·Jennifer O SimmonsKraig S Vandewalle
Oct 25, 2016·Journal of Dentistry·Alexandre Cestari
Dec 28, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Igor Serša
May 9, 2021·Dental Materials : Official Publication of the Academy of Dental Materials·Lígia S BuenoSharanbir K Sidhu

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