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

Stamboulis, Artemis; Matsuya, Shigeki; Hill, Robert G.; Law, Robert V.; Udoh, K.; Nakagawa, Michiko; Matsuya, Yohko

doi:10.1016/j.jdent.2005.08.006

Cited by 29 publications

(24 citation statements)

References 28 publications

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“…The previous studies [13,19] showed that the Al(V) peak disappeared after a certain ageing time, but from our data this species is still present in all the cements after 1 year. The reason why the Al(V) remains in the cements may be due to the presence of the relatively high phosphate content of these glass.…”

Section: Discussioncontrasting

confidence: 57%

“…In addition, most of previous studies [13,19] have been carried out using lower magnetic field strengths of 4.7 T and 9.4 T, which exacerbates the quadrupolar line broadening, resulting in even more poorly resolved spectra and a greater asymmetric tail from the Al(IV) peak where the peak of Al(V) might be expected. Whereas, our studies are carried out at higher field (14.1 T) which greatly mitigates the quadrupolar broadening effect.…”

Section: Discussionmentioning

confidence: 99%

“…The obtained results showed that the setting reaction of the cements depends on the glass composition. However, more information on other nuclei such as 19 F, 29 Si, 31 P and 13 C using the MAS-NMR in the cements is needed to fully understand the setting reactions. The present study is now being extended to other nuclei present in the cements in order to understand the whole setting process.…”

Section: Discussionmentioning

confidence: 99%

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A long-term study on the setting reaction of glass ionomer cements by 27Al MAS-NMR spectroscopy

Zainuddin¹,

Karpukhina²,

Hill³

et al. 2009

Dental Materials

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Objectives. The main objective is the characterization of the setting reaction in glass ionomer cements (GICs) based on experimental glasses using the 27 Al magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy in order to understand the crosslinking process during the setting reaction.Methods. Three types of GICs which are based on fluoro-alumino-silicate glasses (LG125, ART10, and LG26Sr) were studied using 27 Al MAS-NMR to monitor the setting reaction of the cements.Results. The result showed clearly the formation of six coordinate, aluminium Al(VI), that crosslink the carboxyl groups in the PAA. The deconvolution study was performed to quantify the amount of each Al species in the cements. The finding showed that composition of original glass has a substantial effect on the setting behavior of the cements.Significance. Our data demonstrate that the setting reaction of GICs can be followed by 27 Al MAS-NMR spectroscopy discovering the conversion of Al(IV) to Al(VI). Considerable amount of the five coordinate aluminium, Al(V), species was found in the cements aged up to one year. The presence of phosphorus has a strong influence on the setting reaction. The formation of Al-O-P species was postulated to be present in the cement.

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Section: Discussioncontrasting

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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A long-term study on the setting reaction of glass ionomer cements by 27Al MAS-NMR spectroscopy

Zainuddin¹,

Karpukhina²,

Hill³

et al. 2009

Dental Materials

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“…Magic angle spinning (MAS) NMR spectroscopy has in particular been widely used to probe local environments of aluminium and silicon nuclei in cements. Nuclei such as 31 P have not been exploited to the same extent in the context of cement chemistry, despite favourable NMR properties; notable investigations appear in the field of biocompatible dental cements [30,31] and the study of Portland cement [32]. For the phosphate-modified CAC systems studied here, 31 P is a key nucleus which has not previously been examined through the use of advanced NMR techniques.…”

Section: Preprint Version Of Accepted Article Please Cite As: Ma Cmentioning

confidence: 99%

“…The phase assemblages formed in unmodified CAC, and CAC with sodium phosphate modification, are assessed using X-ray diffractometry, thermogravimetric analysis, and local environments are probed through solid state NMR spectroscopic techniques including 27 Al MAS, 31 …”

Section: Preprint Version Of Accepted Article Please Cite As: Ma Cmentioning

confidence: 99%

Identification of the hydrate gel phases present in phosphate-modified calcium aluminate binders

Chavda

Bernal

Apperley

et al. 2015

Cement and Concrete Research

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The conversion of hexagonal calcium aluminate hydrates to cubic phases in hydrated calcium aluminate cements (CAC) can involve undesirable porosity changes and loss of strength.Modification of CAC by phosphate addition avoids conversion, by altering the nature of the reaction products, yielding a stable amorphous gel instead of the usual crystalline hydrate products. Here, details of the environments of aluminium and phosphorus in this gel were elucidated using solid-state NMR and complementary techniques. Aluminium is identified in both octahedral and tetrahedral coordination states, and phosphorus is present in hydrous environments with varying, but mostly low, degrees of crosslinking. A 31 P/ 27 Al rotational echo adiabatic passage double resonance (REAPDOR) experiment showed the existence of aluminium-phosphorus interactions, confirming the formation of a hydrated calcium aluminophosphate gel as a key component of the binding phase. This resolves previous disagreements in the literature regarding the nature of the disordered products forming in this system.

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Physical property investigation of contemporary glass ionomer and resin-modified glass ionomer restorative materials

Moberg

Brewster

Nicholson³

et al. 2018

Clin Oral Invest

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

Cited by 29 publications

References 28 publications

A long-term study on the setting reaction of glass ionomer cements by 27Al MAS-NMR spectroscopy

A long-term study on the setting reaction of glass ionomer cements by 27Al MAS-NMR spectroscopy

Identification of the hydrate gel phases present in phosphate-modified calcium aluminate binders

Physical property investigation of contemporary glass ionomer and resin-modified glass ionomer restorative materials

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