Journal
EUROPEAN POLYMER JOURNAL
Volume 48, Issue 8, Pages 1466-1474Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2012.05.013
Keywords
Resin dental adhesives; Polymerisation; Crosslink density; Fluid filtration; Confocal Raman spectroscopy; ATR-FTIR
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Funding
- Centre of Excellence in Medical Engineering
- Wellcome Trust
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The formulation of appropriate dental adhesives is critical to achieve efficient polymerisation and reduced fluid permeability. The aim of this study was to evaluate the degree of conversion, the crosslink density and the fluid permeability of experimental 2-Hydroxy-ethyl methacrylate (HEMA)-containing or HEMA-free resin adhesives formulated with the use of a hydrophilic ternary photoinitiator system (DPIHP: diphenyliodonium hexa-fluorophosphate). The final FTIR/Raman degree of conversion (DC), DSC glass transition temperature (T-g) and the resin permeability (rP) were then characterised. The inclusion of the hydrophilic ionic salt DPIHP increased the affinity between amphiphilic monomers and binary photoinitiator system enhancing the DC, T-g and the resistance to fluid permeability (p < 0.05). A significant correlation was observed between rP and FTIR/Raman-DC or T-g (p < 0.05). In conclusion, new generation resin adhesives containing hydrophilic monomers and solvents should be formulated on a ternary photoinitiator system including hydrophilic ionic accelerator in order to achieve enhanced physical-chemical characteristics especially when light-cured in a relatively short period time (10-20 s). (C) 2012 Elsevier Ltd. All rights reserved.
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