Push-out bond strength of fiber posts to root dentin using glass ionomer and resin modified glass ionomer cements

Abstract

ObjectiveThe purpose of this study was to assess the push-out bond strength of glass fiber posts to root dentin after cementation with glass ionomer (GICs) and resin-modified glass ionomer cements (RMGICs).Material and MethodsFifty human maxillary canines were transversally sectioned at 15 mm from the apex. Canals were prepared with a step back technique until the application of a #55 K-file and filled. Post spaces were prepared and specimens were divided into five groups according to the cement used for post cementation: Luting & Lining Cement; Fuji II LC Improved; RelyX Luting; Ketac Cem; and Ionoseal. After cementation of the glass fiber posts, all roots were stored at 100% humidity until testing. For push-out test, 1-mm thick slices were produced. The push-out test was performed in a universal testing machine at a crosshead speed of 0.5 mm/minute and the values (MPa) were analyzed by Kolmogorov-Smirnov and Levene's tests and by two-way ANOVA and Tukey's post hoc test at a significance level of 5%.ResultsFiber posts cemented using Luting & Lining Cement, Fuji II LC Improved, and Ketac Cem presented the highest bond strength to root dentin, followed by RelyX Luting. Ionoseal presented the lowest bond strength values (P>0.05). The post level did not influence the bond strength of fiber posts to root dentin (P=0.148). The major cause of failure was cohesive at the cement for all GICs and RMGICs.ConclusionsExcept for Ionoseal, all cements provided satisfactory bond strength values.

Effects of different peracetic acid formulations on post space radicular dentin

“…16,27,28 Although 1% peracetic acid solution was the most effective final irrigation method, it also showed high residual concentrations of oxygen, which would interfere with the adhesion of any resin cement by inhibiting complete polymerization. 29 The findings reported here reinforce those of Pereira et al, [33][34][35][36] who demonstrated that the highest bond strength is provided by glass ionomer cements. This may make conventional glass ionomer cement the most suitable for intracanal post cementation, even when peracetic acid is used to clean the post space.…”

“…One longitudinal groove was made externally in the buccal and lingual root surfaces. [33][34][35][36][37] The roots were divided into 4 groups (n=10) according to the irrigation protocol of the prepared post space as follows: CG (control) distilled water; NA (NaOCl), 2.5% sodium hypochlorite solution (Asfer); LH (LCPA), 1% peracetic acid solution (Sigma; Aldrich) with a low concentration of hydrogen peroxide (40% peracetic acid and 8% hydrogen peroxide); and HH (HCPA), 1% peracetic acid solution (Peresal; Profilática) with a high concentration of hydrogen peroxide (4% peracetic acid and 26% hydrogen peroxide).…”

Effects of Photodynamic Therapy on the Adhesive Interface of Fiber Posts Cementation Protocols

“…Despite PDT prosthetic space antisepsis performance, it releases ROS, mainly singlet oxygen. The present study has shown that PDT affects fiber post cementation protocols; however, further studies should be performed to evaluate the interaction of PDT with other photosensitizing substances and new protocols for fiber post cementation, such as ionomer cements (28).…”

Effect of Post-Space Irrigation with NaOCl And CaOCl at Different Concentrations on the Bond Strength of Posts Cemented with a Self-Adhesive Resin Cement

“…A negative factor associated with the bond strength in root dentin is the limited capacity of the resin cements to dissipate tensions generated during polymerization shrinkage. The cavity configuration factor (C-factor) is related to the ratio of the adhesion area to the free area, which is unfavorable in the root canal, responsible for creating gaps between cement and dentin and affecting the sealing ability of resin cements (22). Therefore, the cement-dentin interface is more susceptible to dentin/ adhesive failure when compared to the cement-post interface.…”