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Biomaterials & Bioengineering

Effects of Resin Hydrophilicity on Dentin Bond Strength

Y. Nishitani1, M. Yoshiyama1, A.M. Donnelly2, K.A. Agee2, J. Sword2, F.R. Tay2 and D.H. Pashley2,*

1 Department of Operative Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan; and
2 Department of Oral Biology & Maxillofacial Pathology, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1129, USA

Correspondence: * corresponding author, dpashley{at}mail.mcg.edu

The purpose of this study was to determine if hydrophobic resins can be coaxed into dentin wet with ethanol instead of water. The test hypothesis was that dentin wet with ethanol would produce higher bond strengths for hydrophobic resins than would dentin wet with water. This study examined the microtensile bond strength of 5 experimental adhesives (50 wt% ethanol/50% comonomers) of various degrees of hydrophilicity to acid-etched dentin that was left moist with water, moist with ethanol, or air-dried. Following composite buildups, hourglass-shaped slabs were prepared from the bonded teeth for microtensile testing. For all 3 types of dentin surfaces, higher bond strengths were achieved with increased resin hydrophilicity. The lowest bond strengths were obtained on dried dentin, while the highest bond strengths were achieved when dentin was bonded moist with ethanol. Wet-bonding with ethanol achieved higher bond strengths with hydrophobic resins than were possible with water-saturated matrices.

Key Words: dentin bonding • hydrophilic resins • wet-bonding • ethanol

Journal of Dental Research, Vol. 85, No. 11, 1016-1021 (2006)
DOI: 10.1177/154405910608501108
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K. Hosaka, Y. Nishitani, J. Tagami, M. Yoshiyama, W.W. Brackett, K.A. Agee, F.R. Tay, and D.H. Pashley
Durability of Resin-Dentin Bonds to Water- vs. Ethanol-saturated Dentin
Journal of Dental Research, February 1, 2009; 88(2): 146 - 151.
[Abstract] [Full Text] [PDF]