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. 2023 Feb 21;16(5):1761.
doi: 10.3390/ma16051761.

Impact of Final Irrigation Protocol on the Push-Out Bond Strength of Two Types of Endodontic Sealers

Germain Sfeir  1 , Frédéric Bukiet  2 , Wajih Hage  1 , Roula El Hachem  1 , Carla Zogheib  1
Affiliations

Impact of Final Irrigation Protocol on the Push-Out Bond Strength of Two Types of Endodontic Sealers

Germain Sfeir et al. Materials (Basel). .

Abstract

Aim: The aim of this study was to assess the impact of the final irrigation protocol on the push-out bond strength of calcium silicate-based sealers when compared to an epoxy resin-based sealer. Materials and Methods: Eighty-four single-rooted mandibular human premolars were shaped using the R25® instrument (Reciproc, VDW, Munich, Germany) and then divided into three subgroups of 28 roots each depending on the final irrigation protocol: EDTA (ethylene diamine tetra acetic acid) and NaOCl activation, Dual Rinse® HEDP (1-hydroxyethane 1,1-diphosphonate) activation or sodium hypochlorite (NaOCl) activation. Then, each subgroup was divided into two groups (14 each) according to the sealer used (AH Plus Jet® or Total Fill BC Sealer®) for single-cone obturation. Dislodgement resistance using a universal testing machine, samples' push-out bond strength and failure mode under magnification were determined. Results: EDTA/Total Fill BC Sealer® showed significantly greater values of push-out bond strength compared with HEDP/Total Fill BC Sealer® and NaOCl/AH Plus Jet®, with no statistical difference with EDTA/AH Plus Jet®, HEDP/AH Plus Jet® and NaOCl/Total Fill BC Sealer®, whereas HEDP/Total Fill BC Sealer® showed significantly lower values of push-out bond strength. The apical third demonstrated higher means of push-out bond strength compared with middle and apical thirds. The most common failure mode was cohesive but showed no statistical difference compared to other types. Conclusions: Irrigation solution and final irrigation protocol affect the adhesion of calcium silicate-based sealers.

Keywords: HEDP; calcium silicate-based sealers; failure; irrigation; push-out bond strength; single cone.

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Conflict of interest statement

The authors deny any conflicts of interest related to this study.

Figures

Figure 1
Figure 1
Schematic drawing of flow of the methodology performed for the present study.
Figure 2
Figure 2
Samples under magnification ×20 as observed just after push-out test illustrating the three possible bond failures. The push out test stops automatically after decohesion of the gutta-percha cone. The latter is nevertheless still visible on the pictures due to its incomplete dislodgment. The blue arrows indicate some areas showing the sealer.
Figure 3
Figure 3
Frequency distribution of the 252 specimens according to the sub-groups and modes of failure.
See this image and copyright information in PMC

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