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Evaluation of New Hollow Sleeve Composites for Direct Post-Core Construction

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 PMM...

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Autores principales: Yoshii, Shinji, Garoushi, Sufyan, Kitamura, Chiaki, Vallittu, Pekka K., Lassila, Lippo V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8658817/
https://www.ncbi.nlm.nih.gov/pubmed/34885547
http://dx.doi.org/10.3390/ma14237397
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author Yoshii, Shinji
Garoushi, Sufyan
Kitamura, Chiaki
Vallittu, Pekka K.
Lassila, Lippo V.
author_facet Yoshii, Shinji
Garoushi, Sufyan
Kitamura, Chiaki
Vallittu, Pekka K.
Lassila, Lippo V.
author_sort Yoshii, Shinji
collection PubMed
description 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.
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spelling pubmed-86588172021-12-10 Evaluation of New Hollow Sleeve Composites for Direct Post-Core Construction Yoshii, Shinji Garoushi, Sufyan Kitamura, Chiaki Vallittu, Pekka K. Lassila, Lippo V. Materials (Basel) Communication 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. MDPI 2021-12-02 /pmc/articles/PMC8658817/ /pubmed/34885547 http://dx.doi.org/10.3390/ma14237397 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Yoshii, Shinji
Garoushi, Sufyan
Kitamura, Chiaki
Vallittu, Pekka K.
Lassila, Lippo V.
Evaluation of New Hollow Sleeve Composites for Direct Post-Core Construction
title Evaluation of New Hollow Sleeve Composites for Direct Post-Core Construction
title_full Evaluation of New Hollow Sleeve Composites for Direct Post-Core Construction
title_fullStr Evaluation of New Hollow Sleeve Composites for Direct Post-Core Construction
title_full_unstemmed Evaluation of New Hollow Sleeve Composites for Direct Post-Core Construction
title_short Evaluation of New Hollow Sleeve Composites for Direct Post-Core Construction
title_sort evaluation of new hollow sleeve composites for direct post-core construction
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8658817/
https://www.ncbi.nlm.nih.gov/pubmed/34885547
http://dx.doi.org/10.3390/ma14237397
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