Setting Reaction of Polyacid Modified Composite Resins or Compomers

Arrondo, J.L.R; Collado, M.I; I, Soler; Triana, R; Ellacuria, J

Setting Reaction of Polyacid Modified Composite Resins or Compomers

J.L.R Arrondo^{*, 1}, M.I Collado¹, Soler I², R Triana², J Ellacuria²

¹ Unidad de Biofísica (Centro Mixto CSIC-UPV/EHU) and Departamento de Bioquímica y Biología Molecular, Universidad del País Vasco, Spain

² Departamento de Estomatología, Facultad de Medicina y Odontología, Universidad del País Vasco, Spain

Article Information

Identifiers and Pagination:

Year: 2009
Volume: 3
First Page: 197
Last Page: 201
Publisher ID: TODENTJ-3-197
DOI: 10.2174/1874210600903010197

Article History:

Received Date: 02/3/2009
Revision Received Date: 07/5/2009
Acceptance Date: 20/8/2009
Electronic publication date: 16/9/2009
Collection year: 2009

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© Arrondo et al.; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

^* Address correspondence to this author at the Unidad de Biofísica (Centro Mixto CSIC-UPV/EHU). Bº Sarriena s/n, Leioa, Vizcaya, Spain; Tel: +34 946 012 485; Fax: + 34 946 013 360; E-mail: joseluis.arrondo@ehu.es

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.

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Ibtisam Al-Hashimi
Department of Surgery
University of Texas Southwestern Medical Center
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RESEARCH ARTICLE

Setting Reaction of Polyacid Modified Composite Resins or Compomers

Article Information

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Abstract

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Press Release

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