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Water-dependent Interfacial Transition Zone in Resin-modified Glass-ionomer Cement/Dentin Interfaces

¹ Pediatric Dentistry and Orthodontics, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Hong Kong SAR, China;
² Restorative Dentistry, School of Dental Science, University of Newcastle, Newcastle upon Tyne, UK;
³ Department of Conservative Dentistry & Biomaterials, Guy’s, King’s & St Thomas Dental Institute, King’s College London, Guy’s Hospital, London, UK; and
⁴ Department of Oral Biology and Maxillofacial Pathology, Medical College of Georgia, Augusta, GA, USA;

^* corresponding author, kfctay{at}netvigator.com

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.

KEY WORDS: RMGIC • absorption layer • hydrated dentin • water movement

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