Abstract
This study was to evaluate the effect of Epigallocatechin-3-gallate (EGCG) on the bond strength of two adhesive systems to the Sodium hypochlorite (NaOCl) treated intraradicular dentin. The roots were accepted regular root canal treatments and post space preparations, and further divided into eight groups according to the four post space pretreatments and two dentin adhesives [Single Bond 2 (SB2) and Clearfil SE Bond (CSB)] used. The push-out strength before and after thermocycling in different root region (coronal and apical), DC of the adhesive and morphologic patterns of treated post space were evaluated. NaOCl + EGCG groups showed the highest push-out strength regardless of the adhesive type, root region and time (P < 0.05). NaOCl pretreatment significantly decreased the push-out strengths and DC of CSB (P < 0.05). EGCG could improve the bonding properties of both SB2 and CSB to NaOCl treated intraradicular dentin. The effect of NaOCl on bonding of a fiber post depended on the type of the adhesive.
Highlights
Years, fiber post has been popularly used to restore endodontically treated teeth with extensive loss of coronal tooth structure[1]
Well bonding is based on the formation of so-called hybrid layer (HL) with resin monomer infiltration into the demineralized dentin, which requires a clean dentinal surface after mechanical post space preparation with the removal of root canal filling material[8]
The null hypotheses to be tested were as the following: (1) EGCG has no effect on bond strength of fiber-post to NaOCl treated intraradicular dentin; (2) the two bonding systems show no difference in their bonding performance in intraradicular dentin
Summary
Fiber post has been popularly used to restore endodontically treated teeth with extensive loss of coronal tooth structure[1]. The thick smear layer on the post space would impair the effective bonding of adhesive resin to intraradicular dentin[10]. Micro-Raman spectroscopy has been proved an effective method to evaluate the DC of adhesives[24] Biocompatible reducing agents, such as ascorbic acid and sodium ascorbate, have seemed to be promising on reversing the negative effects of NaOCl to improve the bonding performance of fiber post in root canals and can be explained by the antioxidant ability of ascorbic acid[25,26,27,28]. The purpose of the present study was to test the effect of Epigallocatechin-3-gallate (EGCG) on the bond strength of two adhesive systems to the Sodium hypochlorite (NaOCl) treated intraradicular dentin. The null hypotheses to be tested were as the following: (1) EGCG has no effect on bond strength of fiber-post to NaOCl treated intraradicular dentin; (2) the two bonding systems show no difference in their bonding performance in intraradicular dentin
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