Abstract
The preset shape and diameter of a prefabricated FRC post rarely follows the anatomy of the root canal. To solve this problem, a new hollow sleeve composite (HSC) system for post-core construction was developed and characterized. A woven fiber was impregnated with two types of resins: Bis-GMA or PMMA, and rolled into cylinders with outer diameter of 2 mm and two different inner diameters, namely 1.2 or 1.5 mm. The commercial i-TFC system was used as a control. Dual-cure resin composite was injected into these sleeves. Additionally, conventional solid fiber post was used as the inner part of the sleeve. The three-point bending test was used to measure the mechanical properties of the specimens and the fracture surface was examined using an electron microscope (SEM). The HSC (1.5 mm, Bis-GMA) revealed a statistically similar flexural modulus but higher flexural strength (437 MPa) compared to i-TFC (239 MPa; ANOVA, p < 0.05). When a fiber post was added inside, all values had a tendency to increase. After hydrothermal accelerated aging, the majority of specimens showed a significant (p < 0.05) decrease in flexural strength and modulus. SEM fracture analysis confirmed that the delamination occurred at the interface between the outer and inner materials. The HSC system provided flexibility but still high mechanical values compared to the commercial system. Thus, this system might offer an alternative practical option for direct post-core construction.
Highlights
Published: 2 December 2021Endodontically treated teeth (ETT) with a significant coronal loss of dentin may need additional support to retain coronal restoration
We aimed to develop a new fiber system that fits to any root canal
We developed a new hollow sleeve composite (HSC) system that can be modified for various post cavities
Summary
Published: 2 December 2021Endodontically treated teeth (ETT) with a significant coronal loss of dentin may need additional support to retain coronal restoration. The use of prefabricated fiber-reinforced composite (FRC) posts is recommended mainly in cases of severe loss of remaining coronal tooth structure to promote the retention of the final restoration and to optimize the biomechanical behavior of the remaining tooth structure [1,2]. Glass FRC posts are the most widely used reinforcing fibers with high tensile strength and good bonding to the resin matrix [4]. Despite the favorable biomechanical behavior of prefabricated glass FRC posts, there has been discussion about the shortcomings as well [2,5,6]. The inadequate bonding ability of a cross-linked prefabricated FRC post to resin cements, composite core materials, and root canal dentine is emphasized [7]
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