Dynamic mechanical analysis and esterase degradation of dentin adhesives containing a branched methacrylate
A study of the dynamic mechanical properties and the enzymatic degradation of new dentin adhesives containing a multifunctional methacrylate are described. Adhesives contained 2‐hydroxyethyl methacrylate, 2,2‐bis[4‐(2‐hydroxy‐3‐methacryloxypropoxy) phenyl]‐propane, and a new multifunctional methacry...
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Published in | Journal of biomedical materials research. Part B, Applied biomaterials Vol. 91B; no. 1; pp. 61 - 70 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Hoboken
Wiley Subscription Services, Inc., A Wiley Company
01.10.2009
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Subjects | |
Online Access | Get full text |
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Summary: | A study of the dynamic mechanical properties and the enzymatic degradation of new dentin adhesives containing a multifunctional methacrylate are described. Adhesives contained 2‐hydroxyethyl methacrylate, 2,2‐bis[4‐(2‐hydroxy‐3‐methacryloxypropoxy) phenyl]‐propane, and a new multifunctional methacrylate with a branched side chain‐trimethylolpropane mono allyl ether dimethacrylate (TMPEDMA). Adhesives were photopolymerized in the presence of 0, 8, and 16 wt % water to simulate wet bonding conditions in the mouth and compared with control adhesives. The degree of conversion as a function of irradiation time was comparable for experimental and control adhesives. In dynamic mechanical analysis, broad tan δ peaks were obtained for all samples, indicating that the polymerized networks are heterogeneous; comparison of the full‐width‐at‐half‐maximum values obtained from the tan δ curves indicated increased heterogeneity for samples cured in the presence of water and/or containing TMPEDMA. The experimental adhesive showed higher Tg and higher rubbery modulus indicating increased crosslink density when compared with the control. The improvement in esterase resistance afforded by adhesives containing the TMPEDMA is greater when this material is photopolymerized in the presence of water, suggesting better performance in the moist environment of the mouth. The improved esterase resistance of the new adhesive could be explained in terms of the densely crosslinked network structure and/or the steric hindrance of branched alkyl side chains. © 2009 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2009 |
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Bibliography: | istex:05F5F02239BD0C775AC530E546FDFF7B45743E8F ArticleID:JBM31374 National Institute of Dental and Craniofacial Research ark:/67375/WNG-XFWP1PML-W National Institutes of Health, Bethesda, MD 20892 - No. R01 DE14392 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Undefined-1 ObjectType-Feature-3 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 |
ISSN: | 1552-4973 1552-4981 1552-4981 |
DOI: | 10.1002/jbm.b.31374 |