Journal of Dentistry
Volume 37, Issue 8 , Pages 616-621, August 2009

One-step self-etching adhesive polymerization: Influence of a self-curing activator

  • Teresa G. Nunes

      Affiliations

    • Centro de Química Estrutural, Complexo Interdisciplinar, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal
    • Corresponding Author InformationCorresponding author. Tel.: +351 218419043; fax: +351 218418132.
    • ,
  • Maria Carolina G. Erhardt

      Affiliations

    • Department of Dental Materials, University of Granada, Campus Universitario de Cartuja s/n, Granada 18071, Granada, Spain
    • ,
  • Manuel Toledano

      Affiliations

    • Department of Dental Materials, University of Granada, Campus Universitario de Cartuja s/n, Granada 18071, Granada, Spain
    • ,
  • Raquel Osorio

      Affiliations

    • Department of Dental Materials, University of Granada, Campus Universitario de Cartuja s/n, Granada 18071, Granada, Spain

Received 11 January 2009; received in revised form 31 March 2009; accepted 6 April 2009. published online 16 April 2009.

Abstract 

Objectives

The objectives of this work were to study the spatially resolved extent of photopolymerization and the final volumetric contraction of the self-etching adhesive Xeno IV (Dentsply/Caulk, Milford, DE, USA) in association with the self-curing agent Aurora (Dentsply/Caulk, Milford, DE, USA), using 1H Stray-Field magnetic resonance imaging (1H STRAFI-MRI).

Methods

One-dimensional 1H STRAFI-MRI images (projections along an axis, profiles) were acquired from the adhesive with and without Aurora, before and after solvent removal. Specimens were observed after the irradiation period recommended by the manufacturers and new profiles were recorded. Extent of polymerization and volumetric contraction were obtained by subtracting the profile of the cured adhesive from the profile of the liquid; the profiles were previously normalized using an external reference signal and the highest magnetization intensity recorded from the cured adhesive, respectively. Data were obtained in the presence of oxygen. Solvent evaporation was measured by gravimetry.

Results

High volumetric contraction was observed for Xeno IV and Xeno IV and Aurora mixture mainly related to solvent evaporation. A drying period favourably influenced the extent of photopolymerization of Xeno IV, which did not increase in the presence of Aurora.

Conclusions

The incorporation of Aurora reduced the extent of polymerization of the one-step adhesive, probably due to the increase in the solvent content of the mixture. It may be that enhancing solvent evaporation is important in order to reach a higher extent of polymerization during the bonding procedure.

Keywords: All-in-one adhesive, Dentin, Evaporation, Photopolymerization, Polymerization shrinkage

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PII: S0300-5712(09)00079-7

doi:10.1016/j.jdent.2009.04.003

Journal of Dentistry
Volume 37, Issue 8 , Pages 616-621, August 2009

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