Effect of chemical structure on degree of conversion in light-cured dimethacrylate-based dental resins.
In this work the room-temperature photopolymerization of Bis-GMA, Bis-EMA, urethane dimethacrylate (UDMA) and triethylene glycol dimethacrylate (TEGDMA) induced by camphoroquinone/N,N-dimethylaminoethyl methacrylate, as photo-initiator system, was followed by FT-IR. The results obtained were then fitted by a non-linear least square method to a rational function, which permitted the accurate calculation of the limiting degree of conversion. The latter was found to increase in the order Bis-GMA < Bis-EMA < UDMA < TEGDMA. This trend is discussed in connection with the chemical structure of dimethacrylates. The photopolymerization of mixtures of Bis-GMA/TEGDMA, Bis-GMA/UDMA and Bis-GMA/Bis-EMA showed a good linear relationship of degree of conversion with the mole fraction of Bis-GMA and in the case of the first pair also with the Tg of the initial monomer mixture.
Sideridou
I
I
Department of Chemistry, Aristotle University of Thessaloniki, Hellas, Greece. siderid@chem.auth.gr
Tserki
V
V
Papanastasiou
G
G
D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry*; D003188:Composite Resins / Q000737:chemistry*; D003722:Dental Alloys; D005898:Glass; D008027:Light; D008689:Methacrylates / Q000737:chemistry*; D008956:Models, Chemical; D011092:Polyethylene Glycols / Q000737:chemistry*; D011109:Polymethacrylic Acids / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013997:Time Factors
D003188:Composite Resins; D003722:Dental Alloys; D008689:Methacrylates; D011109:Polymethacrylic Acids; C080508:poly(triethylene glycol dimethacrylate-1,6-bis(methacryloxy-2-ethoxycarbonylamino)-2,4,4-trimethylhexane) copolymer; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate