title: Impact of replacing Bis-GMA and TEGDMA by other commercially available monomers on the properties of resin-based composites.
abstract: OBJECTIVE
  To evaluate important material properties of six experimental resin-based restorative materials (EXP) with systematically modified resin matrices using conventional and alternative monomers in comparison with an experimental standard (ST).
  
  
  METHODS
  Commercially available monomers were selected according to their molecular weight, functionality, viscosity, and polymerization shrinkage. ST, 71wt% filler, matrix UDMA/Bis-GMA/TTEGDMA and six EXPs with modified organic matrices but the same filler content were manufactured. Flexural strength, flexural modulus, water sorption, solubility and polymerization shrinkage of all EXPs were measured and compared with the results of ST.
  
  
  RESULTS
  ANOVA (p<0.05) revealed significant differences among the materials and all investigated properties. Bis-GMA and UDMA were substituted by alternative monomers without losing flexural strength or modulus. Replacing the diluting monomer TTEGDMA with alternative monomers resulted in increased flexural strength. None of the experimental products with modified matrices showed increased water sorption or solubility but some even performed better than ST. Increased hygroscopic expansion and reduced shrinkage were achieved using a very hydrophilic monomer but no significant differences of water sorption and solubility in comparison with ST were found.
  
  
  CONCLUSIONS
  The results indicated that there are monomers commercially available providing the same or even better properties than conventional matrices.
authors.affiliation: Medical Faculty, Centre of Dentistry, Dept. of Operative and Preventive Dentistry and Endodontics, Heinrich-Heine-University, Moorenstrasse 5, Düsseldorf, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Rüttermann
authors.forename: Irina
authors.initials: I
authors.lastname: Dluzhevskaya
authors.forename: Carmen
authors.initials: C
authors.lastname: Grosssteinbeck
authors.forename: Wolfgang H-M
authors.initials: WH
authors.lastname: Raab
authors.forename: Ralf
authors.initials: R
authors.lastname: Janda
mesh_terms: D000042:Absorption; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins / Q000138:chemical synthesis* / Q000737:chemistry*; D018772:Dental Marginal Adaptation; D003799:Dental Stress Analysis; D008422:Materials Testing; D008689:Methacrylates; D008970:Molecular Weight; D018583:Pliability; D011092:Polyethylene Glycols; D011109:Polymethacrylic Acids; D011140:Polyurethanes; D012117:Resins, Synthetic / Q000737:chemistry*; D012995:Solubility; D014783:Viscosity; D014867:Water
chemical_list: D003188:Composite Resins; D008689:Methacrylates; D011109:Polymethacrylic Acids; D011140:Polyurethanes; D012117:Resins, Synthetic; D014867:Water; C029824:urethane dimethacrylate luting resin; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate