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Volume 2017 (2017), Article ID 6074253, 7 pages
Research Article

Time of Application of Sodium Ascorbate on Bonding to Bleached Dentin

1Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
2Department of Conservative Dentistry, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, Republic of Korea
3Department of Dental Materials, School of Dentistry, Pusan National University, Yangsan, Republic of Korea

Correspondence should be addressed to Jeong-Kil Park

Received 17 April 2017; Accepted 12 July 2017; Published 13 August 2017

Academic Editor: Richard Arinero

Copyright © 2017 Kyoung-Hwa Jung et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This study examined the effects of different application times of sodium ascorbate (SA) on the bond strength of composite resin to bleached dentin. Specimens with an exposed dentin surface were divided into 3 groups according to the type of bleaching agent used: Group A, mixture of sodium perborate (SP) and distilled water (DW); Group B, mixture of SP and hydrogen peroxide (HP); control group, no bleaching. Each group was classified into 10 subgroups. Subgroups IB and DB underwent immediate bonding and delayed bonding, respectively. 10% SA was applied to 3, 5, 10, and 30 minutes and 1, 24, 48, and 72 hours, respectively. Microtensile bond strength (μTBS) was measured after restoration, and the data was analyzed by one-way ANOVA and Scheffé’s test. Before restoration, the dentin surfaces were examined by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). SEM showed that most dentin surfaces were filled with crystals when SA was applied to more than 24 hours. EDS revealed peaks of calcium, carbon, oxygen, and sodium. The application of SA for 5 minutes to 48 hours or for 30 minutes to 24 hours is suggested when a mixture of SP and DW or HP is used, respectively.