Premium
Dynamic mechanical analysis and esterase degradation of dentin adhesives containing a branched methacrylate
Author(s) -
Park JongGu,
Ye Qiang,
Topp Elizabeth M.,
Lee Chi H.,
Kostoryz Elisabet L.,
Misra Anil,
Spencer Paulette
Publication year - 2009
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.31374
Subject(s) - adhesive , methacrylate , materials science , dynamic mechanical analysis , trimethylolpropane , (hydroxyethyl)methacrylate , photopolymer , polymer chemistry , dentin , composite material , polymerization , polyurethane , polymer , layer (electronics)
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 T g 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