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Journal of Dental Research
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Biomaterials & Bioengineering

Durability of Resin-Dentin Bonds to Water- vs. Ethanol-saturated Dentin

K. Hosaka1, Y. Nishitani2, J. Tagami1, M. Yoshiyama2, W.W. Brackett3, K.A. Agee4, F.R. Tay5 and D.H. Pashley4,*

1 Cariology and Operative Dentistry, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan;
2 Department of Operative Dentistry, Okayama University, Graduate School of Medicine and Dentistry, Okayama, Japan;
3 Department of Oral Rehabilitation,
4 Department of Oral Biology, and
5 Department of Endodontics, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA

Correspondence: dpashley{at}mail.mcg.edu

Higher 24-hour resin-dentin bond strengths are created when ethanol is used to replace water during wet bonding. This in vitro study examined if ethanol-wet-bonding can increase the durability of resin-dentin bonds over longer times. Five increasingly hydrophilic experimental resin blends were bonded to acid-etched dentin saturated with water or ethanol. Following composite build-ups, the teeth were reduced into beams for 24-hour microtensile bond strength evaluation, and for water-aging at 37°C for 3, 6, or 12 months before additional bond strength measurements. Although most bonds made to water-saturated dentin did not change over time, those made to ethanol-saturated dentin exhibited higher bond strengths, and none of them fell over time. Decreased collagen fibrillar diameter and increased interfibrillar spacing were seen in hybrid layers created with ethanol-wet-bonding. Increases in bond strength and durability in ethanol-wet-bonding may be due to higher resin uptake and better resin sealing of the collagen matrix, thereby minimizing endogenous collagenolytic activities.

Key Words: dentin bonding • durability • hydrophilicity • ethanol

Journal of Dental Research, Vol. 88, No. 2, 146-151 (2009)
DOI: 10.1177/0022034508328910
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