TODENTJ-25-03-2019_TODENTJ-3-197 1553505098 Bentham Open doi@benthamopen.net Bentham Open The Open Dentistry Journal TODENTJ 1874-2106 9 16 2009 3 1 J.L.R Arrondo M.I Collado Soler I R Triana J Ellacuria The hardening of modified polyacid composite resins (compomers) and glass-ionomers have been studied using infrared spectroscopy. 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 combination of infrared analysis and band narrowing treatments enable us to propose in the glass-ionomer two maturation steps. First, a very rapid equilibrium acid-base related, and second the cross-linking of polycarboxylate with the metal ions present in the cement. In compomers, a new reaction has been described involving polymerization induced by free radicals besides the two steps associated with the acid-base reaction. 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. 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. 9 16 2009 197 201 TODENTJ-3-197 1 10.2174/crossmark_policy opendentistryjournal.com benthamopen.com true Peer Reviewed Single blind Checked with iThenticate 2009-3-02 2009-5-07 2009-8-20 2009-9-16 http://creativecommons.org/licenses/by-nc/3.0/ 10.2174/1874210600903010197 1553505098 https://opendentistryjournal.com/VOLUME/3/PAGE/197/ https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-197/TODENTJ-3-197.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-197/TODENTJ-3-197.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-197/TODENTJ-3-197.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-197/TODENTJ-3-197.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-197/TODENTJ-3-197.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-197/TODENTJ-3-197.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-197/TODENTJ-3-197.pdf https://opendentistryjournal.com/contents/volumes/V3/TODENTJ-3-197/TODENTJ-3-197.xml Quintessence Intl McLean JW 5 587 2004 McLean JW, Nicholson JW, Wilson AD. 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