Abstract
Objective To evaluate the influence of 3 different post-resin matrix systems cemented with dual-cure resin cement in simulated root canals made of PMMA acrylic sheet. Methods 3 types of fiber posts (n = 60) with different resin matrixes divided into 3 groups: group 1 cross-linked FRC Postec Plus post (n = 20), group 2 cross-linked Rely X post (n = 20), and group 3 Interpenetrated IPN Everstick post (n = 20). All posts were cemented using Multilink Automix dual-cure cement. Posts were cemented into acrylic blocks in order to purely test the strength of cement-post interface. After one week storage at 37°C, two sections of 1 mm thickness from middle-third were subjected to micro-push-out test at crosshead speed 0.5 mm/min. Results The data were analyzed using one-way analysis of variance (ANOVA). The variable fiber post-matrix system was found to significantly affect the push-out bond strength (p < 0.001). Group 2 exhibited that the highest mean push-out bond strength was (5.36 + 2.3 MPa), and group 3 showed the lowest mean push-out (0.41 + 0.4 MPa). There was significant difference among the groups regarding the failure mode as chi-square test revealed (p < 0.001). Conclusion Prefabricated cross-linked posts with epoxy-based matrix demonstrated higher bond strength than prefabricated cross-linked posts with Bis-GMA-based matrix and posts with semi-IPN matrix when luted with dimethacrylate-based dual-cured resin cement.
Highlights
Fiber-reinforced posts have been introduced in the early 1990s [1], as an alternative to prefabricated metal posts to restore endodontically treated teeth with excessive loss of tooth structure
Studies have shown that adhesive systems with monomers that have solubility parameters close to that of PMMA such as Bis-GMA, 2hydroxyethyl methacrylate (HEMA), and triethylene glycol dimethacrylate (TEGDMA) can penetrate into the linear polymer phase of posts with an in unpolymerized semiinterpenetrating polymer network (IPN) matrix but not into posts with an epoxy matrix [21]. e aim of this study is to evaluate the bond strength and mode of failure of fiber-reinforced posts with different resin matrices. e null hypothesis is that the micro-push-out bond strength and mode of failure do not vary with the type of the post-resin matrix when luted with Bis-GMA-based resin cement
Push-out bond strength test, in this study, revealed that Relay X post had higher bond strength values than FRC Postec Plus and Everstick fiber posts when luted with dualcured diamethacrylate-based luting agent containing BisGMA, HEMA, and urethane dimethacrylate (UDMA)
Summary
To evaluate the influence of 3 different post-resin matrix systems cemented with dual-cure resin cement in simulated root canals made of PMMA acrylic sheet. 3 types of fiber posts (n 60) with different resin matrixes divided into 3 groups: group 1 cross-linked FRC Postec Plus post (n 20), group 2 cross-linked Rely X post (n 20), and group 3 Interpenetrated IPN Everstick post (n 20). All posts were cemented using Multilink Automix dual-cure cement. Posts were cemented into acrylic blocks in order to purely test the strength of cement-post interface. E variable fiber post-matrix system was found to significantly affect the push-out bond strength (p < 0.001). Prefabricated cross-linked posts with epoxy-based matrix demonstrated higher bond strength than prefabricated cross-linked posts with Bis-GMA-based matrix and posts with semi-IPN matrix when luted with dimethacrylate-based dual-cured resin cement
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