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|Title:||Acid-base complex reactions in resin-modified and conventional glass ionomer cements|
|Keywords:||Absorbance area ratios|
Acid-base complexation reaction
Glass ionomer cement
Resin-modified glass ionomer cement
|Citation:||Wan, A.C.A.,Yap, A.U.J.,Hastings, G.W. (1999). Acid-base complex reactions in resin-modified and conventional glass ionomer cements. Journal of Biomedical Materials Research 48 (5) : 700-704. ScholarBank@NUS Repository. https://doi.org/10.1002/(SICI)1097-4636(1999)48:5<700::AID-JBM15>3.0.CO;2-1|
|Abstract:||Resin-modified glass ionomer cements are a recent development in which the desirable properties of glass ionomer cements and resin-composites are combined. The presence of resin may, however, retard the acid-base reaction of the ionomer component. This has led to a debate regarding the classification of resin modified materials as true glass ionomer cements, and the actual duration of the acid-base reaction after initial setting via light polymerization has taken place. To investigate this issue, a novel method employing FT-IR spectrophotometry was used to monitor the acid-base complexation reaction in a resin-modified glass ionomer cement (Fuji II LC) and a conventional, chemically cured cement (Fuji II Cap). This method involved subtraction of the background 'resin' spectrum from the Fuji II LC spectra and subsequent application of a baseline to obtain the plot of absorbance area ratio in the range of 1685 to 1510 cm-1 (complexed carboxyls) to that in the range of 1750 to 1685 cm-1 (free carboxyls). This study demonstrates evidence of a delayed acid-base reaction for the resin- modified cement, which levels off after 168 hours of cement mixing. In contrast, the complexation reaction of the conventional glass ionomer cement was essentially complete after 24 hours.|
|Source Title:||Journal of Biomedical Materials Research|
|Appears in Collections:||Staff Publications|
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