Effect of Glass Fiber Post Adaptation on Push-Out Bond Strength to Root Dentin

Abstract

The aim of this study was to evaluate the effect of different glass fiber posts (GFPs) diameters on the push-out bond strength to dentin. Forty unirradicular human teeth were endodontically treated and used for cementation of GFPs (White Post DC, FGM) with different diameters (n=10): P1 - ø 1.6 mm coronal x 0.85 mm apical; P2 - ø 1.8 mm coronal x 1.05 mm apical; P5 - ø 1.4 mm coronal x 0.65 mm apical; and PC - customized post number 0.5 with composite resin (Tetric Ceram A2, Ivoclair Vivadent). All GFPs were cemented into the root canal using a dual-curing luting composite (Variolink II, Ivoclar Vivadent). One slice (1.7 mm) of each root third of cemented GFP (cervical, middle, and apical) was submitted to push-out testing. Failure modes of all specimens were classified as: adhesive failure between resin cement and post; adhesive failure between dentin and resin cement; cohesive failure within resin cement, post or dentin; and mixed failure. The data were analyzed with two-way ANOVA and Tukey’s test (a=0.05). The highest bond strength values were presented for the P2 and PC groups. There was no statistically significant difference between the GFP thirds in each group. The groups P2, P5, and PC showed predominantly adhesive failure. For P1, the most prevalent type of failure was adhesive between resin cement and post. It may be concluded that a glass fiber post that is well adapted to the root canal presents higher bond strength values, regardless of GFP third.

Push-out bond strength and failure mode of single adjustable and customized glass fiber posts

“…In this study, bovine teeth were used as they are considered a reliable substitute for human teeth in bond strength studies ( Soares et al, 2016 ). The lower PBS values found are consistent with previous reports using human teeth ( Freitas et al, 2019 , Goracci et al, 2004 , Moura et al, 2017 , Pereira et al, 2021 ). However, these lower values might be attributed to the different composition and tissue structure of bovine teeth compared to human teeth, as reported elsewhere ( Galhano et al, 2009 ).…”

Adhesive strength of fiberglass posts treated with thio-urethane-based experimental silanes

“…Another interesting report was that the bond strength values were not similar between groups with fiberglass posts of different diameters and there was no significant difference between the root regions in all groups. The failures were predominantly adhesive between resin cement and the post; however, the post with the best adaptation to the root canal showed a higher bond strength value (21).…”

“…However, fiberglass posts are subjected to several other factors that can influence the cement-dentine-post bond quality. Among them, length, diameter, shape, surface structure and type of the post, cement layer thickness, application methods of the resin cement, and root canal treatment types (21).…”

Temporary cement residues affect the bond strength and dentin penetration of self‐adhesive resin cement in fiberglass post cementation

“…FGP cementation has a delicate adhesion protocol; several studies have been conducted to find alternatives that improve to radicular dentin adhesion (de Durâo Mauricio, González‐López, Aguilar‐Mendoza, Félix, & González‐Rodríguez, 2007; Freitas, Vitti, Miranda, & Brandt, 2019; Oskoee, Bahari, Kimyai, Asgary, & Katebi, 2016; Prado, Marques, Pereira, Silva, & Simão, 2017). Also, permanent cementation of fiberglass post after temporary cement removal requires an increased care in root canal cleaning and dentin treatment (Altintas, Hamiyet, & Kilic, 2019).…”