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. 2021 Nov 19;21(1):591.
doi: 10.1186/s12903-021-01959-5.

Effect of exposure to etidronic acid on the bond strength of calcium silicate-based cements after 1 and 21 days: an in vitro study

Elena Rebolloso de Barrio  1 , Juan José Pérez-Higueras  2 , Ernesto García-Barbero  1 , Lucía Gancedo-Caravia  1
Affiliations

Effect of exposure to etidronic acid on the bond strength of calcium silicate-based cements after 1 and 21 days: an in vitro study

Elena Rebolloso de Barrio et al. BMC Oral Health. .

Abstract

Background: 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.

Methods: The 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.

Results: BD 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).

Conclusion: POBS results are influenced by the cement, the setting time and the exposure to irrigants.

Keywords: Bond strength; Calcium silicate cements; Etidronic acid; Root canal irrigants; Setting time.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Sample preparation and POBS device. a Circular steel frame with a stem (1) to centre the dentin disc. b Schematic view of a specimen, consisting of a resin cylinder with the tooth slice on the upper surface and with the perforation centred and aligned with the axis. c Lateral view of the specimen with a metal cylinder (2) to prevent extrusion while filling the perforation. d Specimen with perforation filled with CSBC and covered with the RCI (3). e POBS device 4: upper piece holding the cylindrical punch (5), 6: lower piece—specimen holder, 7: cover, 8: hole to centre the punch during the test). f POBS device located in the testing machine (9: alignment device)
Fig. 2
Fig. 2
Bar Graph showing the mean POBS in MPa of each experimental subgroup. Error lines are calculated with a 95% confidence interval. BD, Biodentine; PMTA, ProRoot MTA; EDTA, Ethylenediaminetetraacetic acid; NaOCl, Sodium hypochlorite; HEBP, Etidronic Acid. Significant differences are represented as resulted from the Three-way ANOVA test among setting times (*), cements (**) and root canal irrigants (***)
Fig. 3
Fig. 3
Representative stereomicroscope views at × 40 showing the different failure patterns. Cohesive failures in samples of BD-1 day-saline (a.1) and PMTA-21 days-NaOCl (a.2) groups; Mixed failures in samples of PMTA-1 day-NaOCl + HEBP (b.1) and BD-21 days-EDTA (b.2) groups; Adhesive failures in samples of BD-21 days-saline (c.1) and PMTA-1 day-NaOCl (c.2) groups
See this image and copyright information in PMC

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