Effect of post‐space treatment on retention of fiber posts in different root regions using two self‐etching systems

Abstract

The effect of post-space treatment on the retention of fiber posts in different root regions was evaluated using two self-etching systems. Post spaces were prepared in extracted premolars and then the root canals were subjected to one of the following post-space treatments: (i) water irrigation (control); (ii) etching with 35% phosphoric acid for 30 s; (iii) irrigation with 17% EDTA followed by 5.25% sodium hypochlorite (NaOCl); and (iv) ultrasonic agitation associated with 17% EDTA and 5.25% NaOCl irrigating solutions. The dentin surfaces were examined under scanning electron microscopy (SEM) after different post-space treatments. Fiber posts were then luted in the treated roots using resin cement with either Clearfil SE Bond or Clearfil DC Bond, and the thin-slice push-out test was performed. Scanning electron microscopy showed that all the post-space treatments tested were effective in removal of the smear layer of debris, or sealer/gutta-percha remnants, on the root canal. The apical push-out strength was affected by post-space treatment. Both 35% phosphoric acid etching and ultrasonic agitation in combination with EDTA/NaOCl irrigation improved the apical push-out strength of the fiber post, regardless of the type of self-etching system. A solo irrigation with an EDTA/NaOCl solution resulted in a lower apical push-out strength compared with the other two experimental groups.

Effects of EDTA irrigation and water storage on the bonding durability of different adhesive resin cements to intra-radicular dentin

“…Weakness could also be caused by the difficulty in accessing the apical region or restriction of the flow of adhesive resin cement (de Durâo Mauricio et al, 2007). However, some studies found no significant difference among root regions (Zhang et al, 2008;Babb et al, 2009). In our previous study, although we observed lower bond strength for PF in the apical region, the difference was not significant (Gu et al, 2009).…”

“…It is generally accepted that the efficacy of a dentin adhesive depends mostly on the removal of the smear layer and formation of a hybrid layer between the adhesive resin cement and the exposed collagen fibrils within the demineralized dentin (Pashley et al, 1993;Vichi et al, 2002). Adhesive resin cements developed over the past two decades have resulted in improved bond strength, at least when tested shortly after adhesion (Zhang et al, 2008;Bergoli et al, 2012), but the durability of bond strength is equivocal and remains an important issue (Kitasako et al, 2001;Toledano et al, 2007).…”

“…To improve the bonding effectiveness of adhesive resin cements to the intra-radicular dentin, chemical irrigation has been recommended to pretreat the intraradicular dentin after post space preparation (Coniglio et al, 2008;Zhang et al, 2008). Irrigation with EDTA, known for its mild demineralization and low abrasion on dentinal substrates, has been reported to remove the smear layer effectively (Coniglio et al, 2008).…”

Influence of Relining Post on the Bond Strength of Resin Cements

“…3 They distribute the occlusal stress more uniformly along the root, leading to lower occurrence of root fractures. 4 However, the cementation of GFP is a sensitive technique and some variables may impair the bond between cement and dentin, such as the several materials used for endodontic treatment, [5][6][7] root canal morphological variations, 8,9 control of dentin moisture, formation of bubbles in the resin cement and difficult curing of the resin cement at the middle and apical root thirds. [5][6][7][8][9][10][11][12] Therefore, a successful treatment requires good bonding between…”

Utilização do ácido ascórbico como tentativa de reverter o efeito da desproteinização com hipoclorito de sódio na dentina radicular, utilizando diferentes sistemas de cimentação

“…Zhang et al (2008) testaram, por meio do teste de "push out", a retenção de pinos intrarradiculares utilizando os adesivos Clearfil SE Bond e Clearfil DC Bond.…”