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Influence of Sodium Hypochlorite on Bond Strength of Dual-cured Core Build-up Resin Composite  

Lee, Jun-Bong (Department of Conservative Dentistry, School of Dentistry, Chonbuk National University)
Park, Jong-Duk (Department of Conservative Dentistry, School of Dentistry, Chonbuk National University)
Kwon, Su-Mi (Department of Conservative Dentistry, School of Dentistry, Chonbuk National University)
Yu, Mi-Kyung (Department of Conservative Dentistry, School of Dentistry, Chonbuk National University)
Lee, Kwang-Won (Department of Conservative Dentistry, School of Dentistry, Chonbuk National University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.23, no.4, 2007 , pp. 283-292 More about this Journal
Abstract
Two-step or one-step bonding systems generally inhibit curing process of dual-cured core build-up resin composite for their adhesive acidity. In addition this dual-cured core build-up resin composite can be applied to dentin of pulp chamber and root at the time that complete the endodontic treatment. The purpose of this investigation was to determine the influence of sodium hypochlorite on rnicrotensile bond strength of dual-cured core build-up resin composite. Extracted human molars were horizontally sectioned with 1mm thickness using low speed diamond saw. After the sectioned specimens were divided into 8 groups, adhesive systems (Clearfil SE-Bond, Prime&Bond NT[2-step, 1-step], Adper Prompt L-Pop) were then applied with or without sodium hypochlorite pretreatment. The treated specimen was filled with dual-cured core build-up resin composite (Luxacore, DMG corp., German). Then light cured for 40 seconds and soaked in $37^{\circ}C$ water bath for 24 hours. After the treated specimen was grinded with 1mm width and measured rnicrotensile bond strength by testing machine. Additionally 8 teeth were prepared for SEM evaluation. The results were as follows. : NaOCl treated groups generally had lower rnicrotensile bond strength but did not show any difference statistically except Adper Prompt L-Pop. When the teeth were treated by NaOCl, though the difference of applied adhesive system, it had no statistically significant difference within the NaOCl treated groups except the relation of between ClearFil SE-Bond adhesive system and Adper Prompt L-Pop adhesive system. In the SEM evaluation, NaOCl treated groups presented relatively long resin tags and incomplete hybrid layer formation generally.
Keywords
NaOCl; microtensile bond strength; Luxacore; dual cure; resin tag;
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