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      Micromorfología de la capa híbrida de dos sistemas adhesivos: Análisis al MET Translated title: Hibrid layer micromorphology of two adhesive systems: TEM analysis

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          Abstract

          Numerosos estudios evidencian que existen diferencias micromorfológicas entre los sistemas adhesivos monocomponentes y autograbantes. Con el objetivo de comparar la micromorfología de la Capa Híbrida de ambos sistemas, mediante observación al microscopio electrónico de transmisión (MET), se prepararon cavidades en seis premolares en dentina de mediana profundidad. A tres se les aplicó un sistema convencional monocomponente, y en tres se utilizó un sistema adhesivo autograbante. La capa híbrida formada por el sistema autograbante presentó un patrón regular, más delgado y homogéneo que la formada por el sistema adhesivo convencional. Los grosores promedio de esta estructura fueron de 1 μm y 2 μm respectivamente.

          Translated abstract

          Numerous studies show differences in micromorfological aspects between self-etchings and conventional adhesive systems. Dentin cavities were performed on 6 premolars to compare Micromorphology of the hybrid layer between both systems. One three of them self-etching system was applied, on the other three, the monocomponent conventional system. The hybrid layer formed by the self-etching system showed a regular pattern, thinner and more homogenous than the one formed by the conventional system. The average thickness of the structure was 1 ìm and 2 ìm respectively.

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          Bonding to enamel and dentin: a brief history and state of the art, 1995.

          The acid-etch technique for bonding composite resins to enamel has revolutionized the practice of restorative dentistry. The ability of clinicians to bond restorative materials to enamel has fundamentally changed such diverse areas as cavity preparation, caries prevention, and esthetic treatment options. Although bonding of resin to dentin has proved to be a difficult challenge, ongoing advances are improving the reliability and predictability of dentinal adhesion. The purpose of this article is to provide a brief history of enamel and dentinal bonding, as well as an overview of the current state of the art.
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            Comparative SEM and TEM examination of the ultrastructure of the resin-dentin interdiffusion zone.

            The resin-dentin interdiffusion zone produced by a dentin-adhesive system that removes the smear layer and concurrently decalcifies superficial dentin was morphologically examined by both scanning and transmission electron microscopy. Cross-sectioned resin-bonded dentin discs were etched with an argon-ion beam to make the resin-dentin interface observable by SEM. For the TEM examination, the sections were partly decalcified by an aqueous EDTA solution to facilitate ultramicrotomy and to disclose the ultrastructure of the interdiffusion zone. Both SEM and TEM confirmed the presence of the resin-dentin interdiffusion zone as the junction between the deep unaltered dentin structure and the restorative resin. Within the interdiffusion zone, three sublayers with characteristic ultrastructure and staining were identified by TEM. An upper diffuse black layer contained few structural features. Underneath, partially-altered collagen fibrils were closely packed, mostly running parallel with the interface and perpendicular to the dentinal tubules. Their outline was electron-dense, forming tunnel-like structures. At the base of the upper layer, several stained projections were found to bulge out into the underlying collagen network and appeared to be confined by obstructive, parallel-running collagen fibrils. Finally, the third dense layer, containing hydroxyapatite crystals, demarcated the superficially demineralized dentin layer from the deeper unaltered dentin. Resin diffusion into the decalcified dentin surface layer was evident, but diminished with depth, presumably reducing deeper resin impregnation into the interfibrillar spaces. The citric acid dentin-pretreatment probably caused denaturation of the superficial collagen fibrils. Its decalcifying effect gradually weakened with depth, leaving behind hydroxyapatite crystals at the base of the interdiffusion zone.(ABSTRACT TRUNCATED AT 250 WORDS)
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              Effect of resin primer solvents and surface wetness on resin composite bond strength to dentin.

              J Kanca (1992)
              This study investigated the effect of various solvents on resin composite bond strength to dentin with both wet and dry dentin. A generic dentin bonding system was created with HEMA as the resin in the primer. The highest bond strengths were obtained when acetone was used as the solvent on a wet dentin surface; the lowest bond strengths were obtained with water as the solvent and the primer placed on a wet dentin surface.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                odonto
                Avances en Odontoestomatología
                Av Odontoestomatol
                Ediciones Avances, S.L. (Madrid, Madrid, Spain )
                0213-1285
                2340-3152
                June 2012
                : 28
                : 3
                : 133-140
                Affiliations
                [01] orgnameUniversidad Mayor de Chile orgdiv1Facultad de Odontología Chile
                Article
                S0213-12852012000300004
                10.4321/s0213-12852012000300004
                c89d620d-8d9e-4fc3-b142-1cb8b7e9491a

                This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 International License.

                History
                : 15 February 2011
                : 25 April 2011
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 15, Pages: 8
                Product

                SciELO Spain


                Micromorfología capa híbrida,MET,adhesivo convencional mono componente,adhesivo autograbante,Micromorphology hybrid layer,TEM,conventional adhesive system,self-etching adhesive system

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