Abstract
The aim of this study was to evaluate the push-out bond strength and interface permeability of glass-fiber posts in different regions of post space (cervical, middle, and apical) submitted to different irrigation solutions. Ninety single-rooted human teeth were submitted to endodontic treatment and divided into five groups, according to irrigation solutions: distilled water, 5.25% NaOCl, 25% polyacrylic acid, 2% chlorhexidine, and 23 ppm Ag NP dispersion. Each group was divided in 3 subgroups (n=6) according to cementation: SBU: Adper Scotchbond Universal + RelyX ARC; U200: RelyX U200; MCE: MaxCem Elite. Bond strength and sealing ability were measured in different areas of post space. The data was subjected to ANOVA and Fisher's test (a=0,05). The silver nanoparticle solution showed highest bond strength values and lowest interface permeability in all thirds analyzed for SBU group. In the U200 group, the highest bond strength values were found for sodium hypochlorite solution, with significant difference between this solution and polyacrylic acid. A decrease in bond strength values in cervical to apical direction was found for MCE group and the same behavior were found for others groups. Regarding interface permeability, use of silver nanoparticle solution resulted in lower values in cervical and apical thirds. There was a decrease in bond strength in cervical to apical direction. Different irrigation solutions and intraradicular depth influenced the bond strength and interface permeability of adhesive material to dentin substrate. Silver nanoparticle solution can effectively be used as an irrigation agent in post space prior to fiber post cementation process.
Highlights
With the increase in demand for aesthetic restorations, endodontically treated teeth with little coronal structure have been restored using fiber posts [1]
For the U200 group (Table 3), in general, the highest bond strength values were found for the NaOCl solution
The bond strength and the sealing ability of the glass fiber post bonding interface in different thirds of the intraradicular dentin was evaluated after being subjected to different irrigation solutions and luting strategies
Summary
With the increase in demand for aesthetic restorations, endodontically treated teeth with little coronal structure have been restored using fiber posts [1]. Sodium hypochlorite (NaOCl) is one of the most popular and is widely used in root canal and post space preparation because of its antimicrobial properties and its capacity for dissolving organic tissue [7,8] When NaOCl interact with microorganisms and organic tissue it causes saponification reactions leading to antibacterial and tissue-dissolving effects [8] Another solution widely used is chlorhexidine because of its antimicrobial properties [9], substantivity, and effect on the longevity of the bonding interface [2,9,10]. Polyacrylic acid is not able to remove smear plug, it just removes partially the smear layer, leaving free calcium and phosphate ions on dentin surface [14]
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