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Impact of light intensity on the polymerization kinetics and network structure of model hydrophobic and hydrophilic methacrylate based dental adhesive resin
Abedin, Farhana Ye, Qiang Camarda, Kyle Spencer, Paulette
Abedin, Farhana
Ye, Qiang
Camarda, Kyle
Spencer, Paulette
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Abstract
The impact of light intensity on the degree of conversion (DC), rate of polymerization and network
structure was investigated for hydrophobic and hydrophilic dental adhesive resins. Two and three
component photoinitiating (PI) systems were used in this study. Low light intensities had a
negative impact on the polymerization efficiency for the hydrophilic resin with 2 component PI
system. Incorporation of iodonium salt in the hydrophilic resin significantly improved the
polymerization efficiency of the HEMA/BisGMA system and led to a substantial DC, even at low
light intensities. The results suggested that shorter polymer chains were formed in the presence of
iodonium salt. It appears that there is little or no impact of light intensity on the polymer structure
of the 2 component PI system. Light intensity has subtle impact on the polymer structure of the 3
component PI system. In the case of the hydrophobic resin, the polymer is so highly cross-linked
that the presence of shorter chains for the 3 component PI system does not cause a decrease in the
glass transition temperature (Tg) when compared to the 2 component PI system. For the
hydrophilic resin, the presence of shorter polymer chains in the 3 component PI system reduces
the Tg when compared with the corresponding 2 component PI system.
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Date
2016-11
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Publisher
Wiley
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Keywords
Hydrophobic phase, Hydrophilic phase, Light intensity, Dental adhesive, Photopolymerization, Crosslink structure
Citation
Abedin, F., Ye, Q., Camarda, K., & Spencer, P. (2016). Impact of light intensity on the polymerization kinetics and network structure of model hydrophobic and hydrophilic methacrylate based dental adhesive resin. Journal of Biomedical Materials Research. Part B, Applied Biomaterials, 104(8), 1666–1678. http://doi.org/10.1002/jbm.b.33517