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Fluid Movement across the Resin-Dentin Interface during and after Bonding

¹ Division of Pediatric Dentistry, Hokkaido University, Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Hokkaido, Japan;
² Department of Conservative Dentistry, Health Sciences University of Hokkaido, School of Dentistry, Ishikari-Tobetsu, Hokkaido, Japan;
³ Department of Conservative Dentistry, Faculty of Dentistry, University of Hong Kong, Hong Kong SAR, China;
⁴ Department of Operative Dentistry, University of Sacred Heart, Bauru, SP, Brazil;
⁵ Division of Cariology and Endodontology, Hokkaido University, Graduate School of Dental Medicine, Sapporo, Hokkaido, Japan; and
⁶ Department of Oral Biology and Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA, USA;

^* corresponding author, masanori-h{at}mue.biglobe.ne.jp

This study evaluated the extent of water penetration through resin-dentin interfaces before and after being sealed with adhesives. Four adhesive resin systems (2 total-etch adhesives and 2 self-etching primer adhesives) were used in this study. Dentin disks were placed in a split-chamber device, and in situ fluid movement across dentin was measured, with and without physiological pressure, during bonding procedures or 24 hrs after bonding. The fluid movement across dentin occurs via dentin tubules after acid-etching. Large outward or inward fluid shifts across dentin were observed during air-drying and light-curing for resin application. The amount of fluid movement across resin-bonded dentin when total-etch adhesives were used was significantly greater than that with self-etching adhesives. The milder acid-etching effects of self-etching primers may retain hybridized smear plugs within the tubules that reduce outward fluid flow, resulting in superior dentin sealing.

KEY WORDS: leakage • total-etch adhesive • self-etching primer • hydraulic conductance • smear plug

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