Effect of different endodontic sealers on push-out bond strength of fiber posts

Abstract

Despite the increasing demand for fiber-reinforced composite (FRC) posts, their bonding to root canals is still subject to debate. Endodontic sealers may affect the bond strength between fiber posts and root canal dentin. Aim: To compare the effects of different sealers on fiber post bond strength. Methods: Sixty teeth were divided into 4 groups according to obturation method: GI, gutta-percha without any sealers; GII, gutta-percha and AH26 resin-based sealer; GIII, RealSeal point and RealSeal resin-based sealer, GIV, Guttaflow. Fiber posts were cemented into root canals. Specimens were sectioned, and the bond strength was measured in the middle area. The failure mode was evaluated. Data were analyzed by one-way ANOVA and post hoc test. Results: The highest bond strength was observed in the control group (2.95±1.12), and the least was in the Guttaflow group (1.15±0.78). There was a significant difference between bond strengths of the control and Guttaflow groups and between AH26 and Guttaflow groups (p<0.05). The failure mode was mainly adhesive between dentin and resin cement in all groups. Conclusions: Sealers may have a negative effect on the bond strength of fiber posts to root canal dentin.

Post space preparation timing of root canals sealed with AH Plus sealer

“… 1 2 3 4 Thus, complete obturation of the root canal system and creation of an ‘apical’ seal are important for successful endodontic treatment. 5 6 7 8…”

“…After root canal therapy, the placement of a post and core is often necessary when the coronal tooth structure is inadequate for retaining the crown. 1 3 5 7 13 The integrity of the remaining obturating material, which provides an apical seal, should not be disrupted during post space preparation. 14 15 However, it often deteriorates, causing endodontic treatment failure as a result of reinfection.…”

Effect of pretreatment of root dentin surface with cold atmospheric plasma on improving the bond strength of fiber post and resin cement: In vitro study

“…Micro push-out is a modified method and exhibited better results in reducing the thickness of the specimen (Kececi et al, 2008). This study used AH Plus resin sealer, which was previously shown to have no significant adverse effect on resin cement bond strength and the potential to bond to resin cement (Dibaji et al, 2017;Nesello et al, 2022;Reyhani et al, 2016). This study was conducted to evaluate the effect of root dentin surface pretreatment with CAP on improving the bond strength of fiber posts.…”

Effect of Intracanal Dentin Conditioning with Xylene, Phosphoric Acid and Chlorhexidine on Bond Strength to Glass Fiber Post with Self-Adhesive Cement

“…To increase intra-canal post retention and the strength of endodontically treated teeth, fiber posts are cemented with resin cements [2]. Bond to root canal is weak since it is affected by several factors such as a thick smear layer covering the root surface, presence of sealer residues, high C factor and inability to completely clean the canal [3][4][5][6][7]. The cement-dentin interface is the weakest point of attachment of fiber post to tooth structure [2].…”

“…However, some studies have reported limited etching ability and limited reaction of superficial dentin in use of these types of cements and higher nano-leakage [8]. During application of resin cements for intracanal post cementation, dentinal walls must be cleaned from gutta-percha debris and smear layer since the mechanism of bonding of resin cements is based on penetration of acidic monomers of the cement into dentin and dentin demineralization, which result in micromechanical interlocking of cement [2,7]. Previous studies attempted to clean the canal wall as much as possible [9][10][11].…”