#Deconvolution with essential ftir free
The reaction associated with free radicals could be described as a polymerization of methacrylate monomers together with an aqueous dilution of the filling particles releasing different metal cations that would chelate with the polymer molecules to form a macromolecular structure.Ĭonventional glass ionomer cements (C-GIC) or glass polyalkenoate cements have been used in odontology since their discovery. Using infrared spectroscopy and band narrowing techniques, it is shown that water is essential to complete the hardening process but no acid-base reaction is produced since the COO - band does not appear. In compomers, a new reaction has been described involving polymerization induced by free radicals besides the two steps associated with the acid-base reaction. First, a very rapid equilibrium acid-base related, and second the cross-linking of polycarboxylate with the metal ions present in the cement. The combination of infrared analysis and band narrowing treatments enable us to propose in the glass-ionomer two maturation steps. The acid-base reaction in Ketac-fil, a glass ionomer, was followed by the ratio between the COOH band located around 1715 cm -1 and that corresponding to COO - located around 1570 cm -1. The hardening of modified polyacid composite resins (compomers) and glass-ionomers have been studied using infrared spectroscopy.
0 kommentar(er)
