A systematic review of factors associated with the retention of glass fiber posts

Abstract

This study aimed to identify factors that can affect the retention of glass fiber posts to intra-radicular dentin based on in vitro studies that compared the bond strength (BS) of GFPs cemented with resin cements. Searches were carried out in PubMed and Scopus until December 2013. Bond strength values and variables as type of tooth, presence of endodontic treatment, pretreatment of the post, type of bonding agent (if present), type of cement and mode of cement application were extracted from the 34 included studies. A linear regression model was used to evaluate the influence of these parameters on BS. The presence of endodontic treatment decreased the BS values in 22.7% considering the pooled data (p = 0.013). For regular cement, cleaning the post increased BS when compared to silane application without cleaning (p = 0.032), considering cleaning as ethanol, air abrasion, or phosphoric acid application. Applying the cement around the post and into root canal decreased the resistance compared to only around the post (p = 0.02) or only into root canal (p = 0.041), on the other hand, no difference was found for self-adhesive resin cement for the same comparisons (p = 0.858 and p = 0.067). Endodontic treatment, method of cement application, and post pretreatment are factors that might significantly affect the retention of glass-fiber posts into root canals mainly when cemented with regular resin cement. Self-adhesive resin cements were found to be less technique-sensitive to luting procedures as compared with regular resin cements.

Comparison of Resin Cement Insertion Techniques for Luting Fiberglass Posts

“…Using human or bovine teeth in the studies seems not influence the results and this finding can be considered relevant because the use of extracted human teeth, particularly single-root anterior teeth, is increasingly difficult [15].…”

“…The findings of a systematic review show that applying the cement into the root canal increased post retention when compared with the technique where the cement is also applied around the post. In addition, as cement application around the post is usually carried out with a spatula, this may not be a reliable procedure to prevent incorporation of voids [15]. The use of lentulo drills or syringes for cement insertion could reduce the presence of voids and bubbles that could affect correct cementation of fiberglass posts [16][17][18][19].…”

Choice of Endodontic Fiber Posts and its Influence on Dental Malpractice: An in vitro Evaluation

“…Endodontically treated teeth usually present inadequate remaining coronal structure due to cavity preparation. [6][7][8] The type of definitive restoration chosen to restore endodontically treated maxillary teeth may be influenced by the amount of hard tissues remaining after tooth preparation.…”

“…8,[18][19][20] This is probably related to the highly unfavorable cavity configuration encountered within post spaces and the increased wall-to-wall contraction of resin films during polymerization. 21,22 Therefore, to increase the success rate of the final restoration, several investigations have been directed toward improving retention of the post, including different pretreatment of the posts and dentin 23,24 or use of different luting cements.…”

Relined fiberglass post: an ex vivo study of the resin cement thickness and dentin-resin interface

“…15,16 They are also less technique-sensitive to luting procedures when compared with regular resin cements. 17 However, resin cements that require an adhesive system are another possibility for luting fiberglass posts. 18 Considering the relevance of the resin cement thickness and the type of resin cement on fiberglass post retention, the aim of this study was to evaluate the thickness of resin cements in the different root thirds when using relined fiberglass posts (RP) and conventional fiberglass posts (CP) in weakened roots.…”