title: Effects of water and carboxylic acid monomer on polymerization of HEMA in the presence of N-phenylglycine.
abstract: OBJECTIVE
  This research was designed to study the effect of water or carboxylic acid monomer on the polymerization of 2-hydroxyethyl methacrylate (HEMA) in order to understand the bonding mechanism of dentin bonding systems using N-phenylglycine (NPG).
  
  
  METHODS
  The polymerization of HEMA in the presence of NPG was studied by adding various amounts of water and/or 4-(2-methacryloyloxyethoxycarbonyl) phthalic acid (4-MET) and evaluated using differential scanning calorimetry (DSC).
  
  
  RESULTS
  The addition of water promoted the polymerization of HEMA. Polymerization was further promoted through the addition of 4-MET as a carboxylic acid monomer. Polymerization was promoted at the molar ratio of 4-MET to NPG of 1.0-7.0.
  
  
  CONCLUSIONS
  Moisture on the dentin surface could contribute to improving bond strength in dentin bonding systems using NPG by promoting polymerization at the dentin interface.
authors.affiliation: Institute for Medical and Dental Engineering, Tokyo Medical and Dental University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Imai
authors.forename: A
authors.initials: A
authors.lastname: Suzuki
mesh_terms: D000704:Analysis of Variance; D002152:Calorimetry, Differential Scanning; D002264:Carboxylic Acids / Q000737:chemistry; D001840:Dental Bonding; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005998:Glycine / Q000031:analogs & derivatives* / Q000737:chemistry; D008689:Methacrylates / Q000737:chemistry*; D013997:Time Factors; D014867:Water / Q000737:chemistry; D017155:Wettability
chemical_list: D002264:Carboxylic Acids; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D014867:Water; C021316:N-phenylglycine; C005044:hydroxyethyl methacrylate; D005998:Glycine