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Water-dependent interfacial transition zone in resin-modified glass-ionomer cement/dentin interfaces

Lookup NU author(s): Dr Sharanbir Sidhu

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Abstract

The function of the interfacial transition zone (absorption layer) in resin-modified glass-ionomer cements bonded to deep dentin remains obscure. This study tested the hypotheses that the absorption layer is formed only in the presence of water derived from hydrated dentin and allows for better bonding of resin-modified glass-ionomer cements to dentin. Ten percent polyacrylic acid-conditioned, hydrated, and dehydrated deep dentin specimens were bonded with 2 resin-modified glass-ionomer cements and sealed with resins to prevent environmental water gain or loss. A non-particulate absorption layer was identified over hydrated dentin only, and was clearly discernible from the hybrid layer when bonded interfaces were examined with transmission electron microscopy. This layer was relatively more resistant to dehydration stresses, and remained intact over the dentin surface after tensile testing. The absorption layer mediates better bonding of resin-modified glass-ionomer cements to deep dentin, and functions as a stress-relieving layer to reduce stresses induced by desiccation and shrinkage.

Publication metadata

Author(s): Tay FR, Sidhu SK, Watson TF, Pashley DH

Publication type: Article

Publication status: Published

Journal: Journal of Dental Research

Year: 2004

Volume: 83

Issue: 8

Pages: 644-649

Print publication date: 01/08/2004

ISSN (print): 0022-0345

ISSN (electronic): 1544-0591

Publisher: Sage Publications, Inc

URL: http://dx.doi.org/10.1177/154405910408300812

DOI: 10.1177/154405910408300812

PubMed id: 15271975

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