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The influence of chemical structure on the properties in methacrylate-based dentin adhesives
Park, Jonggu Eslick, John Ye, Qiang Misra, Anil Spencer, Paulette
Park, Jonggu
Eslick, John
Ye, Qiang
Misra, Anil
Spencer, Paulette
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Abstract
Objectives
The objective of this study was to investigate the influence of the chemical structure of methacrylate monomers used in dentin adhesives on degree of conversion (DC), water sorption, and dynamic mechanical properties.
Materials and methods
Experimental adhesives containing 2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy) phenyl]-propane (BisGMA), 2-hydroxyethyl methacrylate (HEMA), and co-monomer, 30/45/25 w/w were photo-polymerized. Ethyleneglycol dimethacrylate (EGDM), diethyleneglycol dimethacrylate (DEGDM), triethyleneglycol dimethacrylate (TEGDMA), 1,3-glycerol dimethacrylate (GDM), and glycerol trimethacrylate (GTM) were used as a co-monomer. The adhesives were characterized with regard to DC, water sorption, and dynamic mechanical analysis and compared to control adhesive [HEMA/BisGMA, 45/55 w/w].
Results
DC and water sorption increased with an increase in the number of ethylene glycol units in the monomer. Experimental adhesive containing GDM showed significantly higher storage moduli (p < 0.05) in both dry and wet samples than experimental adhesives containing EGDM or DEGDM. The rubbery moduli of adhesives containing GDM and GTM were found to be significantly greater (p < 0.05) than that of the control. Adhesives containing GTM exhibited the widest tanδ curves, indicating the greatest structural heterogeneity.
Significance
The hydrophilicity, functionality and size of monomers in dentin adhesives affected the water sorption, solubility, crosslink density and heterogeneity of the polymer network. The experimental adhesives containing GDM and GTM showed higher rubbery moduli, indicating higher crosslink density accompanied by a decrease in the homogeneity of the polymer network structure.
Description
Date
2012-11-01
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Publisher
Elsevier
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Keywords
Dentin adhesives, Structure/property relationships, Dynamic mechanical property, Degree of conversion, Water soption
Citation
Park, Jonggu, John Eslick, Qiang Ye, Anil Misra, and Paulette Spencer. "The Influence of Chemical Structure on the Properties in Methacrylate-based Dentin Adhesives." Dental Materials 27.11 (2011): 1086-093.