Abstract
BackgroundAfter reparation of root perforations with calcium silicate-based cements (CSBC), the surface of the material is expected to be exposed to root canal irrigants (RCI) while resuming the root canal treatment.MethodsThe aim of this study was to compare the effect of exposure to a mixture of sodium hypochlorite (NaOCl) and etidronic acid (HEBP) or other irrigants on the Push Out Bond Strength (POBS) of CSBC after two different setting times. 240 root slices 1 mm thick were obtained from single-rooted human teeth. A 1.4 mm diameter perforation was performed on each slice and filled with Biodentine (BD) or ProRoot MTA (PMTA). After 1 or 21 days they were exposed to 17% ethylenediaminetetraacetic acid, 5.25% NaOCl, a mixture of 5.25% NaOCl and 9% HEBP (NaOCl + HEBP) or saline (n = 15) and submitted to a push-out test. POBS results were analysed with ANOVA and Tukey tests.ResultsBD showed higher POBS than PMTA after 1 day (p < .05). After 21 days no differences were found between materials. After 1 day exposure to NaOCl + HEBP resulted in higher POBS, compared to the other irrigants (p < .05).ConclusionPOBS results are influenced by the cement, the setting time and the exposure to irrigants.
Highlights
After reparation of root perforations with calcium silicate-based cements (CSBC), the surface of the material is expected to be exposed to root canal irrigants (RCI) while resuming the root canal treatment
During the experimental process, 3 of the 240 specimens were discarded (PMTA-Saline-1D, BD-ethylenediaminetetraacetic acid (EDTA)-1D and BD-Saline-21D groups) due to the friction of the punch against the dentin wall caused by an error in the location of the dentin slice in the aligning device
Threeway ANOVA revealed that the Push Out Bond Strength (POBS) was significantly affected by cements (p < 0.001), setting time (p < 0.001) and exposure to RCI (p < 0.001)
Summary
After reparation of root perforations with calcium silicate-based cements (CSBC), the surface of the material is expected to be exposed to root canal irrigants (RCI) while resuming the root canal treatment. Immediate root perforation repair is critical to avoid the contamination of the periodontal ligament, or the extrusion of root canal irrigants (RCI) [1] or root canal filling materials, which could cause an endodontic-periodontal lesion through damage to the epithelial attachment and bone loss [2]. For this reason, it is recommended to repair the perforation even before performing the root canal treatment [3].
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