Journal of Dental Research, Vol 72, 1423-1428, Copyright © 1993 by International & American Associations for Dental Research Online Journals

ARTICLES

Chemical characterization of the resin-dentin interface by micro-Raman spectroscopy

B. Van Meerbeek, H. Mohrbacher, J. P. Celis, J. R. Roos, M. Braem, P. Lambrechts and G. Vanherle
Department of Operative Dentistry and Dental Materials, Katholieke Universiteit te Leuven, Belgium.

The chemical nature of the interface between dentin and adhesive resin materials was characterized by micro-Raman spectroscopy. The resulting chemical profiles were correlated with photomicrographs obtained by SEM after an argon-ion-beam etching treatment of the sample surface. Two commercially available dentin adhesive systems, of which one was also applied with a different conditioning agent, were investigated. Raman spectra, which were recorded along line scans across the interface with a step increment of 1 micron, revealed that resin effectively penetrated 4 to 6 microns deep into the superficially decalcified dentin zone. Across the interface, a gradual transition from resin to dentin over the interdiffusion zone with a mixed contribution of both substances was noticed. Finally, resin appeared to penetrate to the entire decalcification depth of dentin regardless of the aggressiveness of the conditioning procedure.

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