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Journal of Dental Research
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Biomaterials & Bioengineering

Tubular Occlusion Optimizes Bonding of Hydrophobic Resins to Dentin

F.T. Sadek1,2, D.H. Pashley3, M. Ferrari2 and F.R. Tay2,3,*

1 Department of Dental Materials, School of Dentistry, University of São Paulo, Brazil;
2 Department of Restorative Dentistry and Dental Materials, School of Dentistry, University of Siena, Italy; and
3 Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA

Correspondence: * corresponding author, franklintay{at}gmail.com

Although hydrophobic resins may be bonded to acid-etched dentin with an ethanol wet-bonding technique, the protocol is sensitive to moisture contamination when bonding is performed in deep dentin. This study tested the hypothesis that the use of oxalate or poly(glutamic) acid-modified, diluted ceramicrete (PADC) for dentinal tubule occlusion prevents fluid contamination and improves the bonding of an experimental hydrophobic adhesive to acid-etched, ethanol-dehydrated dentin. Mid-coronal and deep acid-etched moist dentin pre-treated with oxalate or PADC was dehydrated by ethanol wet-bonding and infiltrated with the experimental three-step etch-and-rinse hydrophobic adhesive under simulated pulpal pressure. Tensile bond strengths to deep dentin without pre-treatment were severely compromised. Conversely, oxalate and PADC pre-treatments reduced dentin permeability, prevented water contamination, and improved bond strengths. Minimal nanoleakage was identified within hybrid layers created in the oxalate- and PADC-pre-treated deep dentin. The use of tubular occluding agents optimized bonding of hydrophobic resins to dentin.

Key Words: ethanol wet-bonding • hydrophobic resin • tubule occlusion • oxalate • pulpal pressure

Journal of Dental Research, Vol. 86, No. 6, 524-528 (2007)
DOI: 10.1177/154405910708600607
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