Two Modes of Nanoleakage Expression in Single-step Adhesives

Self-etch adhesives that etch, prime, and bond simultaneously should not exhibit incomplete resin infiltration within hybrid layers. We hypothesized that nanoleakage patterns in these systems are artifacts caused by mineral dissolution in mildly acidic silver nitrate. Resin-dentin interfaces bonded with four single-step, self-etch adhesives were examined for nanoleakage by conventional (pH 4.2) and basic ammoniacal (pH 9.5) silver nitrate and prepared for transmission electron microscopy. All adhesives exhibited a reticular mode of nanoleakage within hybrid layers when conventional silver nitrate was used. With ammoniacal silver nitrate, an additional spotted pattern of nanoleakage was observed within adhesive and hybrid layers. The reticular mode of nanoleakage in self-etch adhesives probably represents sites of incomplete water removal that leads to regional suboptimal polymerization. The spotted pattern identified with the use of ammoniacal silver nitrate probably represents potentially permeable regions in the adhesive and hybrid layers that result from the interaction of the basic diamine silver ions with acidic/hydrophilic resin components.

[1]  J. G. Ribelles,et al.  Molecular mobility and hydration properties of segmented polyurethanes with varying structure of soft- and hard-chain segments , 1999 .

[2]  E. Moreau,et al.  The structural characteristics of water trees in power cables and laboratory specimens , 1993 .

[3]  D. Pashley,et al.  Effect of delayed activation of light-cured resin composites on bonding of all-in-one adhesives. , 2001, The journal of adhesive dentistry.

[4]  F. Tay,et al.  Self-contamination of deep dentin by dentin fluid. , 2000, American journal of dentistry.

[5]  Takao Miyashita,et al.  Deterioration of Water-Immersed Polyethylene-Coated Wire by Treeing , 1971, IEEE Transactions on Electrical Insulation.

[6]  J. Filippini,et al.  Influence of polymer morphology on water treeing , 1994 .

[7]  D. Wieliczka,et al.  Interfacial Chemistry of the Dentin/Adhesive Bond , 2000, Journal of dental research.

[8]  D. Pashley,et al.  Aggressiveness of contemporary self-etching systems. I: Depth of penetration beyond dentin smear layers. , 2001, Dental materials : official publication of the Academy of Dental Materials.

[9]  B. Haller.  Recent developments in dentin bonding. , 2000, American journal of dentistry.

[10]  J. Perdigão,et al.  The effect of a re-wetting agent on dentin bonding. , 1999, Dental materials : official publication of the Academy of Dental Materials.

[11]  J. Tagami,et al.  Long-term Durability of Dentin Bonds Made with a Self-etching Primer, in vivo , 1999, Journal of dental research.

[12]  M. Balkenhol,et al.  Practitioner variability effects on dentin bonding with an acetone-based one-bottle adhesive. , 1999, The journal of adhesive dentistry.

[13]  J. G. Ribelles,et al.  Poly(methyl acrylate)/poly(hydroxyethyl acrylate) sequential interpenetrating polymer networks. Miscibility and water sorption behavior , 1999 .

[14]  D. Pashley,et al.  Comparative SEM and TEM observations of nanoleakage within the hybrid layer. , 1995, Operative dentistry.

[15]  M. Tyas,et al.  Nanoleakage patterns of four dentin bonding systems. , 2000, Dental materials : official publication of the Academy of Dental Materials.

[16]  H. Duschner,et al.  Nanoleakage at the composite-dentin interface: a review. , 2001, American journal of dentistry.

[17]  M. Kaga,et al.  In vivo Degradation of Resin-Dentin Bonds in Humans Over 1 to 3 Years , 2000, Journal of dental research.

[18]  Hajime Tanaka,et al.  Simple physical model of liquid water , 2000 .

[19]  C. Hansen,et al.  The Three Dimensional Solubility Parameter-Key to Paint Component Affinities : III ; Independent Calculation of the Parameter Components , 1967 .

[20]  F. Tay,et al.  Distribution of nanofillers from a simplified-step adhesive in acid-conditioned dentin. , 1999, The journal of adhesive dentistry.

[21]  P. Pissis,et al.  Dielectric studies of molecular mobility and microphase separation in segmented polyurethanes , 1999 .

[22]  P. Lambrechts,et al.  Adhesion mechanism of self-etching adhesives , 1999 .

[23]  N. Nakabayashi,et al.  Bonding to dentin with a self-etching primer: the effect of smear layers. , 2001, Dental materials : official publication of the Academy of Dental Materials.

[24]  P. Brunton,et al.  A three-year evaluation of restorations placed with a smear-layer-mediated dentin bonding agent in non-carious cervical lesions. , 1999, The journal of adhesive dentistry.

[25]  H. Yatani,et al.  Correlation of dentin bond durability with water absorption of bonding layer. , 1999, Dental materials journal.

[26]  R. G. Craig,et al.  The effects of moisture on the dielectric relaxation of urethane dimethacrylate polymer and composites. , 2001, Journal of oral rehabilitation.

[27]  N. Nakabayashi,et al.  Bonding to Ground Dentin by a Phenyl-P Self -etching Primer , 1994, Journal of dental research.