Quantitative analysis of aqueous phase composition of model dentin adhesives experiencing phase separation.

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
Qiang YePaulette Spencer

Abstract

There have been reports of the sensitivity of our current dentin adhesives to excess moisture, for example, water-blisters in adhesives placed on over-wet surfaces, and phase separation with concomitant limited infiltration of the critical dimethacrylate component into the demineralized dentin matrix. To determine quantitatively the hydrophobic/hydrophilic components in the aqueous phase when exposed to over-wet environments, model adhesives were mixed with 16, 33, and 50 wt % water to yield well-separated phases. Based upon high-performance liquid chromatography coupled with photodiode array detection, it was found that the amounts of hydrophobic BisGMA and hydrophobic initiators are less than 0.1 wt % in the aqueous phase. The amount of these compounds decreased with an increase in the initial water content. The major components of the aqueous phase were hydroxyethyl methacrylate (HEMA) and water, and the HEMA content ranged from 18.3 to 14.7 wt %. Different BisGMA homologues and the relative content of these homologues in the aqueous phase have been identified; however, the amount of crosslinkable BisGMA was minimal and, thus, could not help in the formation of a crosslinked polymer network in the aqueous phase. Without the ...Continue Reading

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Citations

Mar 21, 2012·Journal of Materials Science. Materials in Medicine·Ranganathan ParthasarathyPaulette Spencer
Mar 19, 2014·Acta Biomaterialia·Farhana AbedinPaulette Spencer
Oct 19, 2016·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Farhana AbedinPaulette Spencer
Jun 11, 2015·International Endodontic Journal·D G SoaresC A de Souza Costa
Apr 18, 2014·Journal of Oral Science·Masashi MiyazakiJeffrey A Platt
Oct 21, 2015·Clinical Oral Investigations·Lucas da Fonseca Roberti GarciaDiana Gabriela Soares
Jan 13, 2015·Journal of Dental Research·F AbedinP Spencer
May 10, 2016·JOM : the Journal of the Minerals, Metals & Materials Society·Farhana AbedinPaulette Spencer

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