Push-Out Bond Strength of EndoSeal Mineral Trioxide Aggregate and AH Plus Sealers after Using Three Different Irrigation Protocols.

Noha Taymour,Ghofran Alquraini,Fatimah Alkhalifa,Zahraa Alwesaibi,Zahraa Alsalman,Shimaa Rifaat,Ahmed Rahoma

doi:10.1055/s-0041-1742128

Noha Taymour, Ghofran Alquraini + Show 5 more

Open Access

https://doi.org/10.1055/s-0041-1742128

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Abstract

The current study was designed to assess the bonding strength of EndoSeal MTA and AH Plus sealers after using three irrigation protocols as follows: (1) 17% Ethylenediamine tetraacetic acid, (2) 7% maleic acid, and (3) 37% phosphoric acid. Push-out bond strength was evaluated for 60 middle root slices of 1-mm thickness each. They were horizontally cut from freshly extracted single-rooted human teeth. A hole in the root canal was made using a carbide round bur of 1.1 mm in diameter in a middle third root slice. Specimens were dipped in 2.5% NaOCl, and then they were grouped into three groups; G1: 17% EDTA, G2: 7% maleic acid, and G3: 37% phosphoric acid as a final irrigant for 3 minutes. Each group was subdivided into two subgroups, according to the type of sealer, either EndoSeal MTA or AH Plus. After the full set of the sealer, the bond strength was evaluated with the push-out test by applying a force to each slice using a plunger with a 1-mm diameter. The one-way Tukey's post hoc test, analysis of variance (ANOVA) test, and Student's t-test were utilized to gather data and statistically evaluate it. The irrigation protocol used exhibited significant influence on the bond strength of EndoSeal MTA and AH Plus sealers. AH Plus sealer subgroups showed the highest bond strength with 7% maleic acid, followed by 37% phosphoric acid, and 17% EDTA. While in the EndoSeal MTA sealer subgroups, the highest bond strength was shown with the 17% EDTA followed by 7% maleic acid and 37% phosphoric acid, respectively. The present study revealed that the type of the final irrigant significantly impacts the bond strength of the sealer used. The AH Plus sealer bond strength was improved by using the 7% maleic acid as a final irrigant. In contrast, the EndoSeal MTA sealer showed the best results with the 17% EDTA as a final irrigant.

Highlights

Successful root canal treatment relies on the proper cleaning of the canal and complete removal of the microorganisms
While in the EndoSeal Mineral Trioxide Aggregate (MTA) sealer subgroups, the highest bond strength was shown with the 17% EDTA followed by 7% maleic acid and 37% phosphoric acid, respectively
The AH Plus sealer bond strength was improved by using the 7% maleic acid as a final irrigant

Summary

Introduction

Successful root canal treatment relies on the proper cleaning of the canal and complete removal of the microorganisms. Using an inert root canal filling material that can fill the canal space three dimensionally and inhibit any bacterial invasion from the oral cavity to the periapical tissues can improve root canal treatment success rates.[1]. The most used irrigating solution in the endodontic field is sodium hypochlorite (2.5% NaOCl). It is widely used because of its capability to dissolve the organic tissues inside the canal. The existence of the smear layer on the canal walls negatively affects the bond strength at the root sealer–dentine interface.[2] Many demineralizing agents have been used as adjunctive to the 2.5% NaOCl to ensure the hybridized smear layer elimination.[3]

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