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.
Highlights
Received for publication: March 03, 2015 Accepted: June 24, 2015Correspondence to: Ladan Ranjbar Omrani Department of Operative Dentistry School of Dentistry, Tehran University of Medical Sciences North Kargar St, Amirabad, Tehran, IranThe selection of a proper type of restoration for natural function and esthetic rehabilitation is a major concern in weakened teeth[1]
Resin-based cements play an important role in the durability of fiber posts
Plunger size diameter was chosen according to root canal diameter. This method results in more reliable, reproducible and clinic-like conditions than other tests[22].This study evaluated the bond strength at the middle third using two serial sections, because other studies reported that the portion of the root canal to have a significant effect on the bond strength of fiber posts[23,24]
Summary
Endodontic sealers should seal the canal laterally and apically and have acceptable adaptation to the root canal dentin[11]. There is a growing interest in the utilization of resin-based sealers that bond simultaneously to core material and the canal wall, creating a monoblock[12]. These sealers often have the ability to penetrate lateral canals, accessory canals and dentinal tubules[11]. It appears that they cannot be removed completely after canal preparation, which
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