title: Electron-beam irradiation of experimental denture base polymers.
abstract: OBJECTIVE
  Since the properties of polymers can be influenced using electron-beam irradiation, the aim of this study was to investigate whether electron-beam post-curing can improve the mechanical properties of experimental denture base polymers.
  
  
  METHODS
  Rectangular specimens of different experimental polymeric blends were electron-beam irradiated (post-cured) with 25 kGy and 200 kGy using an electron accelerator of 4.5 MeV. Fracture toughness, work of fracture, Vickers hardness and colour changes were measured and compared in non-irradiated specimens.
  
  
  RESULTS
  The mechanical properties of all the investigated polymers seemed to benefit from low-energy electron-beam irradiation (25 kGy). Using an energy dose of 200 kGy, all blends showed deteriorated mechanical properties resulting from chain breakage. Nevertheless, all investigated polymers had undesirable colour changes after electron-beam irradiation.
  
  
  CONCLUSIONS
  Mechanical properties of experimental polymethyl-methacrylate could be changed using electron-beam irradiation. Because of discolorations caused by the irradiation levels investigated, these levels cannot be recommended for practical applications.
authors.affiliation: Department of Prosthetic Dentistry, Regensburg University Medical Center, Germany. Andreas.Faltermeier@klinik.nui-regensburg.de
authors.forename: Andreas
authors.initials: A
authors.lastname: Faltermeier
authors.forename: Michael
authors.initials: M
authors.lastname: Behr
authors.forename: Martin
authors.initials: M
authors.lastname: Rosentritt
authors.forename: Gerhard
authors.initials: G
authors.lastname: Handel
mesh_terms: D000704:Analysis of Variance; D001610:Beta Particles; D003116:Color; D003432:Cross-Linking Reagents; D003819:Denture Bases; D006244:Hardness / Q000528:radiation effects; D008689:Methacrylates / Q000528:radiation effects*; D020366:Methylmethacrylate / Q000528:radiation effects; D018583:Pliability / Q000528:radiation effects
chemical_list: D003432:Cross-Linking Reagents; D008689:Methacrylates; D020366:Methylmethacrylate; C004919:ethylene dimethacrylate; C102737:1,4-butanediol dimethacrylate