title: Water sorption and dynamic mechanical properties of dentin adhesives with a urethane-based multifunctional methacrylate monomer.
abstract: OBJECTIVE
  Our previous study showed the synthesis and characterization of a novel urethane-linked trimethacrylate monomer for use as a co-monomer in dentin adhesives. The objective of this work was to further investigate the performance of dentin adhesives containing a new monomer, with particular emphasis on the water sorption and viscoelastic behavior of the crosslinked networks.
  
  
  METHODS
  Dentin adhesives contained 2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy) phenyl]-propane (BisGMA), 2-hydroxyethyl methacrylate (HEMA), and a new multifunctional methacrylate with urethane-linked groups-1,1,1-tri-[4-(methacryloxyethylaminocarbonyloxy)-phenyl]ethane (MPE) and were photo-polymerized in the presence or absence of water. Adhesives were characterized with regard to degree of conversion (DC), viscosity, water sorption/solubility, and dynamic mechanical analysis (DMA) and compared with BisGMA/HEMA controls.
  
  
  RESULTS
  The experimental adhesives exhibited DC and solubility comparable to that of the control, regardless of the presence or absence of water. All the experimental adhesives tested showed less water sorption, lower tandelta peak heights, and higher rubbery modulus than the control.
  
  
  CONCLUSIONS
  Dentin adhesives containing a new multifunctional methacrylate showed better dynamic thermomechanical properties and water sorption relative to controls, without compromising DC and solubility. Thus, MPE, when included as a component of methacrylate dentin adhesives, may provide enhanced durability in the moist environment of the mouth.
authors.affiliation: Bioengineering Research Center, School of Engineering, University of Kansas, Lawrence, KS, USA.
authors.forename: Jong-Gu
authors.initials: JG
authors.lastname: Park
authors.forename: Qiang
authors.initials: Q
authors.lastname: Ye
authors.forename: Elizabeth M
authors.initials: EM
authors.lastname: Topp
authors.forename: Anil
authors.initials: A
authors.lastname: Misra
authors.forename: Paulette
authors.initials: P
authors.lastname: Spencer
mesh_terms: D000042:Absorption; D000327:Adsorption; D000465:Algorithms; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D055119:Elastic Modulus; D004548:Elasticity; D006801:Humans; D008422:Materials Testing; D055595:Mechanical Phenomena; D008689:Methacrylates / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry*; D012995:Solubility; D013059:Spectrum Analysis, Raman; D013696:Temperature; D013997:Time Factors; D044366:Transition Temperature; D014783:Viscosity; D014867:Water / Q000737:chemistry*
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D011108:Polymers; D011140:Polyurethanes; C091839:urethanetrimethacrylate; D014867:Water; D017438:Bisphenol A-Glycidyl Methacrylate; C005044:hydroxyethyl methacrylate