title: Effects of resin hydrophilicity on dentin bond strength.
abstract: 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.
authors.affiliation: Department of Operative Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nishitani
authors.forename: M
authors.initials: M
authors.lastname: Yoshiyama
authors.forename: A M
authors.initials: AM
authors.lastname: Donnelly
authors.forename: K A
authors.initials: KA
authors.lastname: Agee
authors.forename: J
authors.initials: J
authors.lastname: Sword
authors.forename: F R
authors.initials: FR
authors.lastname: Tay
authors.forename: D H
authors.initials: DH
authors.lastname: Pashley
mesh_terms: D000704:Analysis of Variance; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D000431:Ethanol; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D016018:Least-Squares Analysis; D008422:Materials Testing; D008964:Molar, Third; D019279:Resin Cements / Q000737:chemistry*; D012995:Solubility; D013718:Tensile Strength; D014867:Water; D017155:Wettability
chemical_list: D017220:Dentin-Bonding Agents; D019279:Resin Cements; D014867:Water; D000431:Ethanol