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http://dx.doi.org/10.5395/JKACD.2009.34.1.051

QUANTITATIVE COMPARISON OF PERMEABILITY IN THE ADHESIVE INTERFACE OF FOUR ADHESIVE SYSTEMS  

Chang, Ju-Hea (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University)
Yi, Kee-Wook (Geochronology Team, Korea Basic Science Institute)
Kim, Hae-Young (Craniomaxillofacial Life Science(BK 21), School of Dentistry, Seoul National University)
Lee, In-Bog (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University)
Cho, Byeong-Hoon (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University)
Son, Ho-Hyun (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University)
Publication Information
Restorative Dentistry and Endodontics / v.34, no.1, 2009 , pp. 51-60 More about this Journal
Abstract
The purpose of this study was to perform quantitative comparisons of water permeable zones in both the adhesive and the hybrid layer before and after thermo cycling in order to assess the integrity of the bonding interface. Twenty eight flat dentin surfaces were bonded with a light-cured composite resin using one of four commercial adhesives [OptiBond FL (OP), AdheSE (AD), Clearfil SE Bond (CL). and Xeno III (XE)]. These were sectioned into halves and subsequently cut to yield 2-mm thick specimens; one specimen for control and the other subjected to thermocycling for 10,000 cycles. After specimens were immersed in ammoniacal silver nitrate for 24 h and exposed to a photo developing solution for 8 h, the bonded interface was analyzed by scanning electron microscopy (SEM) and wavelength dispersive spectrometry (WDS) at five locations per specimen. Immediately after bonding. the adhesive layer of OP showed the lowest silver uptake, followed by CL, AD. and XE in ascending order (p < 0.0001); the hybrid layer of CL had the lowest silver content among the groups (p = 0.0039). After thermocycling, none of the adhesives manifested a significant increase of silver in either the adhesive or the hybrid layer. SEM demonstrated the characteristic silver penetrated patterns within the interface. It was observed that integrity of bonding was well maintained in OP and CL throughout the thermocycling process. Adhesive-tooth interfaces are vulnerable to hydrolytic degradation and its permeability varies in different adhesive systems, which may be clinically related to the restoration longevity.
Keywords
Dentin; Adhesive; SEM; WDS; Thermocycling; Permeability;
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Times Cited By KSCI : 3  (Citation Analysis)
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