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      A comparative study of the physical properties of conventional and Grander-modified adhesive systems Translated title: Estudo comparativo das propriedades físicas de sistemas adesivos convencional e Grander-modificado

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          Abstract

          PURPOSE: The objective of this study was to evaluate the influence of the Grander technology in reducing the surface tension and contact angle of a self-etch adhesive system. METHODS: Distilled water and Xeno III self-etch adhesive system (Dentsply) were modified by physical contact with the Flexible unit Grander system to revitalize water, for 48 hours, resulting in four groups: Group 1 - Xeno III under normal conditions; Group 2 - Xeno III modified by Grander; Group 3 - distilled water under normal conditions; Group 4 - distilled water system modified by the Grander system;. Surface tension and contact angle (dentin substrate and titanium plate) of the adhesive system and water in normal and Grander-modified conditions was measured with a goniometer. Data were analyzed by ANOVA and Tukey test (5%). RESULTS: Grander technology reduced the surface tension of water but not of the adhesive system Xeno III. The contact angle property of the adhesive ystem was not affected. CONCLUSION: Grander technology did not interfere with the surface tension and contact angle physical properties of the Xeno III self-etch adhesive system.

          Translated abstract

          OBJETIVO: Esta pesquisa verificou os efeitos da tecnologia Grander na alteração da tensão superficial e ângulo de contato de um sistema adesivo autocondicionante. METODOLOGIA: O sistema adesivo autocondicionante Xeno III (Dentsply) e a água destilada foram modificados pelo contato físico com a unidade flexible do sistema Grander para revitalização de águas por 48 horas, resultando em 4 grupos: Grupo 1 - sistema adesivo Xeno III em condições de normalidade; Grupo 2 - sistema adesivo Xeno III modificado pelo sistema Grander; Grupo 3 - água destilada em condições de normalidade; Grupo 4 - água destilada modificada pelo sistema Grander. A tensão superficial dos líquidos foi verificada em goniômetro utilizando cinco medidas para cada gota de líquido. O ângulo de contato foi medido com o goniômetro sobre os substratos placa de titânio e dentes bovinos. Os dados foram submetidos aos testes ANOVA e Tukey (5%). RESULTADOS: Houve redução significativa da tensão superficial da água com a modificação pelo sistema Grander. Não houve redução da tensão superficial e ângulo de contato para o sistema adesivo Xeno III. CONCLUSÃO: A tecnologia Grander não interferiu com a tensão superficial e o ângulo de contato para o sistema adesivo Xeno III.

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          A simple method of increasing the adhesion of acrylic filling materials to enamel surfaces.

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            Aggressiveness of contemporary self-etching systems. I: Depth of penetration beyond dentin smear layers.

            This study examined, with the use of transmission electron microscopy (TEM), the aggressiveness of three self-etching adhesive systems in penetrating dentin smear layers of different thickness. Dentin disks were produced from extracted human third molars. For the control group, the middle dentin surface was cryofractured to create a bonding surface that was devoid of a smear layer. The experimental teeth were polished with wet 600 or 60-grit SiC paper to produce bonding surfaces with thin and thick smear layers. They were bonded using one of the three self-etching systems: Clearfil Mega Bond (Kuraray), Non-Rinse Conditioner and Prime&Bond NT (Dentsply DeTrey) and Prompt L-Pop (ESPE). Bonded specimens were then demineralized and embedded in epoxy resin for TEM examination. For Mega Bond, thin authentic hybrid layers between 0.4-0.5 microm were found. Smear layer and smear plugs were retained as part of the hybridized complex. For Non-Rinse Conditioner/Prime&Bond NT, the authentic hybrid layers were between 1.2-2.2 microm thick. Smear layer and smear plugs were completely dissolved in dentin with thin smear layers, but were partially retained as part of the hybridized complex in those with thick smear layers. For Prompt L-Pop, authentic hybrid layers were 2.5-5 microm thick and smear layer and smear plugs were completely dissolved even in dentin with thick smear layers. Contemporary self-etching systems may be classified as mild, moderate and aggressive based on their ability to penetrate dentin smear layers and their depth of demineralization into the subsurface dentin. The more aggressive system completely solubilized the smear layer and smear plugs and formed hybrid layers with a thickness approaching those of phosphoric acid conditioned dentin.
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              The clinical performance of adhesives.

              Traditional mechanical methods of retaining restorative materials have been replaced to a large extent by tooth conserving adhesive restorative techniques. Because adhesives have been evolving so rapidly for the last few years, the timing is right for evaluating the clinical status of present day adhesives. Current literature with regard to the clinical performance of adhesives has been reviewed. An overview of currently available adhesive systems is provided and a categorization of these adhesives according to their clinical application procedure and their intended mechanism of adhesion is proposed. Parameters of direct relevance to the clinical effectiveness of adhesives are discussed in relation to the clinical effectiveness of today's adhesives. The clinical performance of present day adhesives has significantly improved, allowing adhesive restorations to be placed with a high predictable level of clinical success. Most modern adhesive systems are superior to their predecessors, especially in terms of retention that is no longer the main cause of premature clinical failure. Recent adhesives also appear less sensitive to substrate and other clinical co-variables. As the remaining major shortcoming of modern adhesives, none of these modern systems however appears yet to be able to guarantee hermetically sealed restorations with margins free of discoloration for a long time.
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                Author and article information

                Journal
                roc
                Revista Odonto Ciência
                Rev. odonto ciênc.
                Pontifícia Universidade Católica do Rio Grande do Sul (Porto Alegre, RS, Brazil )
                1980-6523
                2011
                : 26
                : 4
                : 315-320
                Affiliations
                [01] São José dos Campos SP orgnameSão Paulo State University orgdiv1School of Dentistry Brazil
                Article
                S1980-65232011000400007 S1980-6523(11)02600407
                10.1590/S1980-65232011000400007
                fb1482f4-ca53-4e9f-ac55-cad6fbb3d10a

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 05 April 2010
                : 16 October 2011
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 21, Pages: 6
                Product

                SciELO Brazil

                Categories
                Original Article

                tensão superficial,surface tension,Dentina,Dentin
                tensão superficial, surface tension, Dentina, Dentin

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