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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MDPI AG
2021-12-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/23/7397 |
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| author | Shinji Yoshii Sufyan Garoushi Chiaki Kitamura Pekka K. Vallittu Lippo V. Lassila |
| author_facet | Shinji Yoshii Sufyan Garoushi Chiaki Kitamura Pekka K. Vallittu Lippo V. Lassila |
| author_sort | Shinji Yoshii |
| collection | DOAJ |
| 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, <i>p</i> < 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 (<i>p</i> < 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. |
| first_indexed | 2024-03-10T04:49:21Z |
| format | Article |
| id | doaj.art-633c815e070642698ea61e32c301a804 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T04:49:21Z |
| publishDate | 2021-12-01 |
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| series | Materials |
| spelling | doaj.art-633c815e070642698ea61e32c301a8042023-11-23T02:42:51ZengMDPI AGMaterials1996-19442021-12-011423739710.3390/ma14237397Evaluation of New Hollow Sleeve Composites for Direct Post-Core ConstructionShinji Yoshii0Sufyan Garoushi1Chiaki Kitamura2Pekka K. Vallittu3Lippo V. Lassila4Department of Biomaterials Science and Turku Clinical Biomaterial Center—TCBC, Institute of Dentistry, University of Turku, 20500 Turku, FinlandDepartment of Biomaterials Science and Turku Clinical Biomaterial Center—TCBC, Institute of Dentistry, University of Turku, 20500 Turku, FinlandDivision of Endodontics and Restorative Dentistry, Kyushu Dental University, Fukuoka 803-8580, JapanDepartment of Biomaterials Science and Turku Clinical Biomaterial Center—TCBC, Institute of Dentistry, University of Turku, 20500 Turku, FinlandDepartment of Biomaterials Science and Turku Clinical Biomaterial Center—TCBC, Institute of Dentistry, University of Turku, 20500 Turku, FinlandThe 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, <i>p</i> < 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 (<i>p</i> < 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.https://www.mdpi.com/1996-1944/14/23/7397fiber postcore constructionhollow fiberflexural properties |
| spellingShingle | Shinji Yoshii Sufyan Garoushi Chiaki Kitamura Pekka K. Vallittu Lippo V. Lassila Evaluation of New Hollow Sleeve Composites for Direct Post-Core Construction Materials fiber post core construction hollow fiber flexural properties |
| 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 | fiber post core construction hollow fiber flexural properties |
| url | https://www.mdpi.com/1996-1944/14/23/7397 |
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