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    Effect of initiator on photopolymerization of acidic, aqueous dental model adhesives

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    Spencer_2009.pdf (1.864Mb)
    Issue Date
    2009-09-15
    Author
    Guo, Xinglin
    Peng, Zhonghua
    Spencer, Paulette
    Wang, Yong
    Publisher
    Wiley
    Type
    Article
    Article Version
    Scholarly/refereed, author accepted manuscript
    Rights
    This is the peer reviewed version of the following article: Guo, X., Peng, Z., Spencer, P. and Wang, Y. (2009), Effect of initiator on photopolymerization of acidic, aqueous dental model adhesives. J. Biomed. Mater. Res., 90A: 1120–1127. doi: 10.1002/jbm.a.32185, which has been published in final form at http://doi.org/10.1002/jbm.a.32185. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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    Abstract
    This study evaluated different initiator systems in self-etching model adhesives, in which camphorquinone (CQ) or [3-(3,4-dimethyl-9-oxo-9H-thioxanthen-2-yloxy)-2-hydroxylpropy] trimethylammonium chloride (QTX) was employed as a photoinitiator (dye). N-phenylglycine (NPG), ethyl 4-dimethylaminobenzoate (4E) or 2-(dimethylamino) ethyl methacrylate (DMAEMA) was used as the coinitiator (CI). The role of diphenyliodonium hexafluorophosphate (DPIHP) in the polymerization process was also studied. The concentrations of dye, CI, and DPIHP in model adhesives were all maintained at 0.022 mmol per gram monomer. The model adhesive contained two monomers: (bis[2-(methacryloyloxy)ethyl] phosphate) (2MP) and 2-hydroxyethyl methacrylate (HEMA) whose mass ratio was 1:1, thus representing an acidic and hydrophilic formulation. The polymerization rate and the degree of conversion (DC) of the model adhesives with 5, 15, or 25% water content were determined using FTIR/ATR with a time-based spectrum analysis. The results indicated that with CQ as the photoinitiator, 4E appeared to be the most efficient CI, whereas the CQ-DMAEMA combination led to very low radical generation efficiency (DC < 5%). DPIHP exhibited little effect on the polymerization process. With QTX as the photoinitiator, however, DPIHP played an essential role. Without DPIHP, all three QTX-CI systems failed to initiate polymerization (DC < 5%). The QTX-DPIHP combination, on the other hand, was found to be a viable initiator system. The above results provide the critical information for the development of self-etching adhesive systems.
    URI
    http://hdl.handle.net/1808/24238
    DOI
    https://doi.org/10.1002/jbm.a.32185
    Collections
    • Mechanical Engineering Scholarly Works [135]
    Citation
    Guo, X., Peng, Z., Spencer, P. and Wang, Y. (2009), Effect of initiator on photopolymerization of acidic, aqueous dental model adhesives. J. Biomed. Mater. Res., 90A: 1120–1127. doi:10.1002/jbm.a.32185

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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