Yap, Adrian U-Jin and Eweis, Ahmed Hesham and Yahya, Noor Azlin (2020) Dynamic Viscoelastic Characterization of Bulk-fill Resin-based Composites and Their Conventional Counterparts. Operative Dentistry, 45 (2). pp. 173-182. ISSN 0361-7734, DOI https://doi.org/10.2341/19-005-L.
Full text not available from this repository.Abstract
This study compared the viscoelastic properties of restorative and flowable bulk-fill resin-based composites (RBCs) with their conventional counterparts and evaluated the impact of aqueous solutions on viscoelastic properties. The materials examined included three conventional RBCs (Filtek Z350, Tetric N Ceram, and Beautifil II), three restorative bulk-fill RBCs (Filtek Bulk-Fill Restorative, Tetric N Ceram Bulk-Fill, and Beautifil Bulk-Fill Restorative) in addition to three flowable bulk-fill RBCs (Filtek Bulk-Fill Flowable, Tetric N Flow Bulk-Fill, and Beautifil Bulk-Fill Flowable). Beam-shaped specimens (123232 mm) were fabricated using customized stainless-steel molds, finished, and measured. The specimens were randomly divided into four groups and conditioned in air (control), artificial saliva, 0.02 N citric acid, and 50% ethanol-water solution for seven days at 378C. They were then subjected to dynamic mechanical analysis (n = 10) in flexure mode at 378C with a frequency of 0.1 to 10 Hz. Storage modulus, loss modulus, and loss tangent data were subjected to statistical analysis using one-way analysis of variance/Tukey post hoc test at a significance level of a = 0.05. Viscoelastic properties of the RBCs were found to be product and conditioning medium dependent. For most RBCs, exposure to aqueous solutions, particularly an ethanol-water solution, degraded viscoelastic properties. With the exception of Filtek Bulk-Fill Restorative, bulk-fill restorative and flowable RBCs generally had significantly lower storage and loss modulus than their conventional counterparts regardless of conditioning medium. Conventional RBCs are thus favored over their bulk-fill counterparts, particularly for high-stress-bearing areas. © 2020 Indiana University School of Dentistry. All rights reserved.
| Item Type: | Article |
|---|---|
| Funders: | University of Malaya special grant (BKS010-2017) |
| Uncontrolled Keywords: | Composite Resins; Dental Materials; Materials Testing; Saliva, Artificial |
| Subjects: | R Medicine > RK Dentistry |
| Divisions: | Faculty of Dentistry |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 26 Feb 2021 03:01 |
| Last Modified: | 26 Feb 2021 03:01 |
| URI: | http://eprints.um.edu.my/id/eprint/25773 |
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