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.
Highlights
In vitro studies are usually used to test materials and techniques before clinical application
Prior endodontic treatment led to a 22.7% decrease in bond strength (BS) values (p = 0.013)
When the cement was applied into the root canal alone, or when the mode of cement application was not described, retention was statistically higher compared with the application of cement both into the root canal and around the post (34.7% with p = 0.003 and 71.7% with p < 0.001, respectively)
Summary
In vitro studies are usually used to test materials and techniques before clinical application. A systematic review[9] showed that the type of luting cement used influences the retention of GFPs in root canals but the large degree of. Heterogeneity of the studies included was emphasized This heterogeneity was partly due to the various factors that can influence bonding, including cement application mode, post pretreatment, and sample storage conditions. The influence of some factors on bond strength (BS) of GFPs has been addressed;[10,11,12] it is important to evaluate as many variables as possible to determine the interactions between these factors associated with the retention of posts in root canals. Identifying a clear influence of post/sample-related factors will aid researchers in standardizing preclinical and clinical studies
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