Intra-radicular dentin treatments and retention of fiber posts with self-adhesive resin cements

Abstract

The aim of this study was to evaluate the effect of treating intraradicular dentin with irrigating solutions on the retention of glassfiber posts luted with self-adhesive resin cement. Bovine incisors were endodontically treated, and 9-mm-deep postholes were prepared. Before inserting the cement, the root canals were irrigated with various solutions: 11.5% polyacrylic acid for 30 s, 17% EDTA for 60 s, or 5% NaOCl for 60 s, respectively. Irrigation with distilled water was used in the control group. After all specimens had been rinsed with distilled water, the excess moisture was removed and the posts were luted using either BisCem (Bisco) or RelyX Unicem clicker (3M ESPE). Seven days after luting, the specimens were sectioned transversally into 1-mm-thick slices, which were submitted to push-out testing on a mechanical testing machine. Bond strength data (n = 6 per group) were analyzed by twoway ANOVA and Student-Newman-Keuls' test (α = 0.05). For Unicem, EDTA showed lower bond strength than the other solutions, which had similar results. For BisCem, EDTA showed higher bond strength than the other treatments, while application of NaOCl yielded higher bond strength than polyacrylic acid whereas the control group had intermediate results. In conclusion, irrigating root canals before insertion of selfadhesive resin cements, especially EDTA, might interfere with retention of the fiber posts.

Bond strength of self-adhesive resin cements to composite submitted to different surface pretreatments

“…Irrespective of the surface pretreatment performed, Unicem showed higher bond strength than BisCem. Other studies reported similar results when bonding SARCs to tooth tissues and ceramics 10,11,26. Unicem has a higher pH-neutralization ability than BisCem, improving its mechanical properties 21,22…”

“…According to manufacturers, SARCs do not require pretreatment and their application is accomplished using a single clinical step. Several studies have evaluated the bonding ability of SARCs to dental tissues, with results generally depending on the materials tested 8-11. However, the presence of extensively destroyed coronal structures is relatively common in the clinical setting, requiring the preparation of a composite restoration (core) to serve as an abutment.…”

Preference for using posts to restore endodontically treated teeth: findings from a survey with dentists

“…2,3,4,5 Factors related to posts, such as material, esthetics, design, luting techniques, and factors related to teeth, such as remaining coronal structure, presence of ferrule and root length, have been seen to influence post selection and survival of these restorations. 6,7,8,9 Furthermore, the literature has shown that factors related to dentists can also influence the decision-making process, specifically in regard Declaration of Interests: The authors certify that they have no commercial or associative interest that represents a conflict of interest in connection with the manuscript.…”

Can intra-radicular cleaning protocols increase the retention of fiberglass posts? A systematic review

“…45 In contrast, NaOCl solution alone partially removes the smear layer, causing removal of dentinal proteins and making the dentin surface hydrophilic, which could impair resin cement polymerization. 46 The current study was conducted by in vitro studies due to the difficulty of evaluating this parameter in vivo. Only human teeth were included in this study because they are closest to the clinical conditions in which the posts are installed.…”