Objectives: The aim of this study was to determine the physico-mechanical properties of a high viscosity glass ionomer cement (GIC) reinforced with TiO nanotubes (TiO-nt).
Methods: TiO-nt was incorporated into the GIC powder components (Ketac Molar EasyMix™) in concentrations of 0% (control group), 3%, 5%, 7% by weight. Compressive strength (n = 10/group), three point bending for flexural strength (n = 18/group), microshear bond strength to dentin and failure mode (n = 20/group), and surface roughness and weight loss before and after brushing simulation (30,000 cycles) (n = 8/group) were evaluated. Data were submitted to Shapiro-Wilk, ANOVA, Tukey and Chi-square tests (α ≤ 0.05).
Results: Addition of 5% of TiO-nt into GIC presented the highest values for compressive strength and differed from the control, 3% and 7% groups (p = 0.023). There were no significant differences in flexural strength (p = 0.107) and surface roughness before and after the dental brushing (p = 0.287) among the groups. GIC added with 5% TiO-nt showed the lowest weight loss values (p = 0.01), whereas the control, 3% or 5% TiO-nt groups presented similar microshear bond strength values (p ≥ 0.05). The 5% TiO-nt group featured higher microshear bond strength than the 7% TiO-nt group (p = 0.034). Cohesive in material was the most representative failure mode for all groups.
Significance: The incorporation of TiO-nt did not affect GIC's adhesiveness to dentin, but improved its compressive strength at 5%. Furthermore, TiO-nt decreased the percentage of weight loss after GIC's surface wear.
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http://dx.doi.org/10.1016/j.dental.2020.01.018 | DOI Listing |
In this project, cement-based composites reinforced with slag powder (abbreviated as SP), steel slag powder (abbreviated as SSP), and desulfurization gypsum (abbreviated as FGD) were used as the research objects, and the preparation, mechanical properties, and strengthening mechanism of the composites were systematically studied. A laser particle analyzer (Malvern Instruments Analysis) was used to determine that the particle sizes of the raw SSP, SP, and FGD materials were concentrated between 5 and 40 μm, indicating that they were fine-grained minerals. SSP and SP are highly active alkaline substances.
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Energy School, Xi'an University of Science and Technology, Xi'an 710054, China. Electronic address:
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Department of Oral and Maxillofacial Surgery, First Hospital of Shanxi Medical University, Xinjian South Road 85#, Taiyuan, China, Taiyuan, 030001, CHINA.
Ultraviolet-assisted Direct Ink Writing(UV-DIW), an extrusion-based additive manufacturing technology, has emerged as a prominent 3D printing technique and is currently an important topic in bone tissue engineering research. This study focused on the printability of double-network (DN) bioink (Nano-hydroxyapatite/Polyethylene glycol diacrylate(nHA/PEGDA)). Next, we search for the optimal UV-DIW printing parameters for the scaffold formed by nHA-PEGDA.
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