Restor Dent Endod.  2014 Nov;39(4):282-287. 10.5395/rde.2014.39.4.282.

Push-out bond strength of a self-adhesive resin cement used as endodontic sealer

• Gurgel-Filho ED
• Lima FC
• Saboia VD
• Coutinho-Filho TdS
• Neves AD
• Silva EJ

• KMID: 2316909
• DOI: http://doi.org/10.5395/rde.2014.39.4.282

Abstract

OBJECTIVES
The aim of the present study was to investigate the bond strength of RelyX Unicem (3M) to root canal dentin when used as an endodontic sealer.
MATERIALS AND METHODS
Samples of 24 single-rooted teeth were prepared with Gates Glidden drills and K3 files. After that, the roots were randomly assigned to three experimental groups (n = 8) according to the filling material, (1) AH Plus (Dentsply De Trey GmbH)/Gutta-Percha cone; (2) Epiphany SE (Pentron)/Resilon cone; (3) RelyX Unicem/Gutta-Percha cone. All roots were filled using a single cone technique associated to vertical condensation. After the filling procedures, each tooth was prepared for a push-out bond strenght test by cutting 1 mm-thick root slices. Loading was performed on a universal testing machine at a speed of 0.5 mm/min. One-way analysis of variance and Tukey test for multiple comparisons were used to compare the results among the experimental groups.
RESULTS
Epiphany SE/Resilon showed significantly lower push-out bond strength than both AH Plus/Gutta-Percha and RelyX Unicem/Gutta-Percha (p < 0.05). There was no significant difference in bond strength between AH Plus/Gutta-Percha and RelyX Unicem/Gutta-Percha (p > 0.05).
CONCLUSIONS
Under the present in vitro conditions, bond strength to root dentin promoted by RelyX Unicem was similar to AH Plus. Epiphany SE/Resilon resulted in lower bond strength values when compared to both materials.

Keyword

Bond strength; Push out test; Resin-based cement; Root canal filling materials

MeSH Terms

Dental Pulp Cavity
Dentin
Resin Cements*
Root Canal Filling Materials
Tooth
Resin Cements
Root Canal Filling Materials

Figure

• 

  Figure 1 The types of interfacial failure in the Resilon/Epiphany group. (a) A micrograph at higher magnification showing the most commonly identified type of interfacial failure of the bonded intraradicular dentin (arrow); (b) A view of the previous micrograph, at lower magnification, showing the interfacial failure-along the surface (debonded intraradicular dentin); (c) A type of interfacial failure that was identified in specimen 2, in which the root fillings probably showed gaps after the polymerized process; (d) The Epiphany sealer contraction material.

• 

  Figure 2 Images illustrating the types of interface taken from the AH-Plus/Gutta-Percha and RelyX/Resilon groups. (a) A micrograph at higher magnification showing the most commonly identified type of interfacial good adaptation of RelyX to the bonded intraradicular dentin (arrow); (b) A view of the previous micrograph, at lower magnification, showing the bonded interfacial surface; (c) The type of bonded interfacial surface of AH-Plus sealer; (d) A view of the previous micrograph, at lower magnification, showing the good adaptation of AH-Plus gutta-percha group.

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