Journal of Dentistry
Volume 35, Issue 4 , Pages 302-308, April 2007

The role of acrylophosphonic acid monomers in the formation of hybrid layers based on self-etch adhesives

  • Marie A Bayle

      Affiliations

    • Department of Biomaterials, Faculty of Odontology, University Toulouse III, 3 Chemin des Maraîchers, 31062 Toulouse, Cedex 4, France
    • ,
  • Geneviève Grégoire

      Affiliations

    • Department of Biomaterials, Faculty of Odontology, University Toulouse III, 3 Chemin des Maraîchers, 31062 Toulouse, Cedex 4, France
    • Corresponding Author InformationCorresponding author. Tel.: +33 5 62 17 29 40; fax: +33 5 61 25 47 19.
    • ,
  • Patrick Sharrock

      Affiliations

    • Department of Medical and Bioinorganic Chemistry, University Toulouse III, Toulouse, France

Received 23 June 2006; received in revised form 28 September 2006; accepted 8 October 2006.

Abstract 

The role of acrylophosphonic acid monomers in the formation of hybrid layers based on self-etch adhesives.

Objectives

Our plan was to define the reaction products formed when an acrylophosphonic acid reacts with tooth hard tissue. Our aim was to describe the incorporation of the reaction products in the hybrid layer formed.

Methods

Potentiometric methods were used to measure acid dissociation constants and investigate calcium complex formation. Infrared spectroscopy and NMR were used to follow water contents and show transformation of phosphorous containing compounds.

Results

The acrylophosphonic acid contained in AdheSE (Ivoclar Vivadent, Schaan, Liechtenstein) is characterized by two acidities with pKa1=2.4 and pKa2=7.0, and interacts with calcium ions in a purely ionic fashion. When hydroxyapatite crystals are dissociated by the presence of AdheSE, brushite is formed together with a calcium cross-linked network of the phosphonate containing copolymer.

Conclusion

The results give a new image of the hybrid layer where the adhesive behaves like an ionomer resin incorporating collagen but also minerals and salt bridges.

Keywords: Dental adhesive, Hybrid layer, Acrylophosphonate monomer, Chemical bonding, Cross-linking

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PII: S0300-5712(06)00195-3

doi:10.1016/j.jdent.2006.10.006

Journal of Dentistry
Volume 35, Issue 4 , Pages 302-308, April 2007

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