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http://dx.doi.org/10.5395/JKACD.2006.31.2.103

Effect of additional coating of bonding resin on the microtensile bond strength of self-etching adhesives to dentin  

Jung, Moon-Kyung (Department of Conservative Dentistry, School of Dentistry, Seoul National University)
Cho, Byeong-Hoon (Department of Conservative Dentistry, Dental Research Institute, Intellectual Biointerface Engineering Center, Seoul National University)
Son, Ho-Hyun (Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Seoul National University)
Um, Chung-Moon (Department of Conservative Dentistry, School of Dentistry, Dental Research Institute, Seoul National University)
Han, Young-Chul (Department of Conservative Dentistry, School of Dentistry, Seoul National University)
Choung, Sae-Joon (Department of Conservative Dentistry, School of Dentistry, Seoul National University)
Publication Information
Restorative Dentistry and Endodontics / v.31, no.2, 2006 , pp. 103-112 More about this Journal
Abstract
This study investigated the hypothesis that the dentin bond strength of self-etching adhesive (SEA) might be improved by applying additional layer of bonding resin that might alleviate the pH difference between the SEA and the restorative composite resin. Two SEAs were used in this study; Experimental SEA (Exp, pH: 1.96) and Adper Prompt (AP, 3M ESPE, USA, pH: 1.0) In the control groups they were applied with two sequential coats In the experimental groups, after applying the forst coat of assigned SEAs, the D/E bonding resin of All-Bond 2 (Bisco Inc., USA, pH: 6.9) was applied as the intermediate adhesive. Z-250 (3M ESPE, USA) composite resin was built-up in order to prepare hourglass-shaped specimens . The microtensile bond strength (MTBS) was measured and the effect of the Intermediate layer on the bond strength was analyzed for each SEA using t-test. The fracture mode of each specimen was inspected using stereomicroscope and Field Emission Scanning Electron Microscope (FE-SEM). When D/E bonding resin was applied as the second coat, MTBS was significantly higher than that of the control groups . The incidence of the failure between the adhesive and the composite or between the adhesive and dentin decreased and that of the failure within the adhesive layer increased. According to the results , applying the bonding resin of neutral pH can increase the bond strength of SEAs by alleviating the difference in acidity between the SEA and restorative composite resin.
Keywords
Self-etching adhesive; Microtensile bond strength test; pH; Intermediate layer; Fracture mode;
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