Abstract
Objective: This study evaluated the influence of fiber composition, diameter and post-curing treatments performed at relining on flexural strength and modulus of fiber-posts. Materials and methods: Sixty posts of Reforpost® Glass Fiber [GF]) and Reforpost® Carbon Fiber [CF] (Angelus, Londrina, PR, Brazil) with diameters of 1.0mm and 1.4mm were used. Each group was further subdivided into three subgroups (n=5) according to treatment received: dry-stored control group (C), oven-cured (Ov) or autoclaved (Ac). A universal testing machine measured flexural strength and modulus of all specimens. Results: Post composition and post-curing treatments had no significant effects on flexural properties of specimens while post diameter had significant effects (p< 0.05). The highest flexural strength and modulus (MPa) (1331±95.8 and 21532±1550, respectively) were obtained with Ov/GF/1.1, while lowest values (890±79.4 and 10675±952, respectively) were for Ac/GF/1.5. Conclusions: 1.1mm diameter posts had better mechanical properties than 1.5mm thick posts. Neither post composition nor post-curing procedures affected the mechanical properties of relined posts.
Highlights
Fiber-reinforced composite (FRC) posts have been used for decades as alternatives to the more conventional ones, including prefabricated titanium posts or cast metal posts, as fiber posts offer the advantages of generally having favorable biomechanical and optical properties, eliminating the need for the laboratory intervention, in addition to being easier to remove[1]
As opposed to metal or cast posts which fail mostly due to root fracture, the most common cause of reported in vivo failure of fiber posts was the pullout of the cement-post-restoration assembly, through debonding between fiber post-resin and/ or resin-root canal dentin interfaces as a result of inadequate bond strength or shrinkage stresses generated along canal walls during the polymerization of resin cements[3,4]
This study investigated the effects of fiber post composition and diameter as well as the post-curing treatment indicated for the relining composite resin on the flexural strength and flexural modulus of posts
Summary
Fiber-reinforced composite (FRC) posts have been used for decades as alternatives to the more conventional ones, including prefabricated titanium posts or cast metal posts, as fiber posts offer the advantages of generally having favorable biomechanical and optical properties, eliminating the need for the laboratory intervention, in addition to being easier to remove[1]. As opposed to metal or cast posts which fail mostly due to root fracture, the most common cause of reported in vivo failure of fiber posts was the pullout of the cement-post-restoration assembly, through debonding between fiber post-resin and/ or resin-root canal dentin interfaces as a result of inadequate bond strength or shrinkage stresses generated along canal walls during the polymerization of resin cements[3,4]. Relining of the fiber posts with composite resins was previously proposed to overcome such a problem[5,6]. The fiber post is covered with composite resin and inserted into the canal, ini-
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