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Some Clinically Relevant Mechanical Properties of a Newly Introduced Flowable Resin Composite

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Aim: This study aimed to evaluate hardness and flexural properties of some flowable composite. Materials and methods. A specially split Teflon mold was designed (4 mm diameter × 2 mm height) for construction of 30 specimens, 10 of each tested material; Smart Dentin Replacement (SDR), Esthtic Flow (EF) and Filtek Z350X (FS). For SDR, another mold (4 mm diameter × 4 mm height) was used to make cylindrical specimens having a thickness of 4 mm to assure what is claimed by manufacturer. The specimens were measured from both sides (top and bottom) using Vickers hardness tester. For flexural characteristics, (60) rectangular bar-shaped specimens (25 mm × 2 mm × 2 mm) of the three tested resin composite materials were packed in a specially designed mold at 23±1 °C. After the 24 h water storage, half of the specimens (10 specimens of each group) were subsequently thermocycled for 3000 cycles in water baths at +5 and +55 °C, prior to testing with dwell time 30 s and the transit time was 5 s. The three-point bending test was performed with a universal testing machine. The data was collected and then statistically analyzed. Results: The top and bottom of SDR samples recorded the least mean VHN values (32.3±5.27 and 33±4.68 VHN) respectively while they were the highest values for FS (46.6±3.76 and 46.3±2.67 VHN) respectively. EF recorded intermediate values which were 38.9±2.17 for the top and 37.5±3.19 VHN for the bottom. There was statistically significant difference among VHN of the three tested materials where FS showed the highest results (46±3.76 VHN), followed by EF (37±2.17 VHN) while the least results was recorded by SDR (33±4.37 VHN). On the other hand, there was no statistically significant difference between the hardness of SDR samples measured either in 2 mm (31.50±5.05 VHN) or 4 mm (30.57±3.97 VHN) thickness. All the tested materials show insignificant flexural characteristics values either before or after thermocycling. Exceptionally, flexural strength value of SDR before thermocycling (124.8±6.573 MPa) is significantly lower than its value after thermocycling (182±18.371 MPa). Conclusions: Although SDR has the least hardness values of all the tested materials, it can satisfactorily cured in 4 mm. Thermocycling had no effect on the flexural properties of all tested materials except for those of SDR that showed a remarkable increase after thermocycling.
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Keywords: FLEXURAL CHARACTERISTICS; FLOWABLE COMPOSITE RESINS; HARDNESS

Document Type: Research Article

Publication date: May 1, 2014

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  • Journal of Biomaterials and Tissue Engineering (JBT) is an international peer-reviewed journal that covers all aspects of biomaterials, tissue engineering and regenerative medicine. The journal focuses on the broad spectrum of research topics including all types of biomaterials, their properties, bioimplants and medical devices, biofilms, bioimaging, BioMEMS/NEMS, biosensors, fibers, tissue scaffolds, tissue engineering and modeling, artificial organs, tissue interfaces, interactions between biomaterials, blood, cells, tissues, and organs, regenerative medicine and clinical performance.
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