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In-vitro bioactivity evaluation and physical properties of an epoxy-based dental sealer reinforced with synthesized fluorine-substituted hydroxyapatite, hydroxyapatite and bioactive glass nanofillers

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Bioactive Materials 2019年第1期4卷 322-333页

作者： Bahaa Abdulrazzaq Jerri Al-Bakhsh farhad shafiei Atieh Hashemian Kiana Shekofteh Behnam Bolhari Marjan Behroozibakhsh Department of Dental Biomaterials School of DentistryTehran University of Medical SciencesTehranIran Department of Conservative Dentistry Dental School of University of BasraBasraIraq Department of Dental Biomaterials School of Dentistry/Research Center for Science and Technology in MedicineTehran University of Medical SciencesTehranIran Department of Endodontic School of DentistryTehran University of Medical SciencesTehranIran

The purpose of this study was to evaluate the physical properties and bioactivity potential of epoxy-based dental sealers modified with synthesized bioactive glass(BAG),hydroxyapatite(HA)and fluorine substituted hydroxyapatite(FHA)*** synthesized powders were incorporated at 10%and 20%into the epoxy-based dental *** setting time,flow and solubility and microhardness of the modified and unmodified samples were *** bioactivity was evaluated using FESEM-EDX and elemental mapping,ATR-FTIR and *** flow value of all of the experimental groups except the FHA modified samples,was greater than 20 *** solubility,no specimens exhibited more than 1%weight *** solubility value of the FHA groups was statistically significant lower than other groups(p≤0.001).The mean hardness values of all of the modified samples were significantly higher than the unmodified group(p≤0.001).Regarding bioactivity,in vitro study revealed that after 3 days immersion in SBF a compact and continuous calcium phosphate layer formed on the surface of epoxy sealers containing BAG and HA *** on these results,the addition of BAG and HA nanoparticles did not adversely alter the physical properties of epoxy ***,they improved the in vitro bioactivity of the epoxy sealer.

关键词： Bioactivity Bioactive glass Epoxy-based dental sealer Hydroxyapatite Fluorine-substituted hydroxyapatite

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Process−microstructure−properties relationship in Al−CNTs−Al2O3 nanocomposites manufactured by hybrid powder metallurgy and microwave sintering process

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Transactions of Nonferrous Metals Society of China 2020年第9期30卷 2339-2354页

作者： Meysam TOOZANDEHJANI farhad OSTOVAN Khairur Rijal JAMALUDIN Astuty AMRIN Khamirul Amin MATORI Ehsan shafiei Razak Faculty of Technology and Informatics Universiti Teknologi Malaysia Kuala Lumpur54100 Jalan SemarakKuala LumpurMalaysia Department of Material Science and Engineering Islamic Azad UniversityBandar Abbas BranchBandar AbbasHormozganIran Department of Physics Faculty of ScienceUniversiti Putra Malaysia43400SerdangSelangorMalaysia

Al−2CNTs−xAl2O3 nanocomposites were manufactured by a hybrid powder metallurgy and microwave sintering *** correlation between process-induced microstructural features and the material properties including physical and mechanical properties as well as ultrasonic parameters was *** was found that physical properties including densification and physical dimensional changes were closely associated with the morphology and particle size of nanocomposite *** maximum density was obtained by extensive particle refinement at milling time longer than 8 h and Al2O3 content of 10 wt.%.Mechanical properties were controlled by Al2O3 content,dispersion of nano reinforcements and grain *** optimum hardness and strength properties were achieved through incorporation of 10 wt.%Al2O3 and homogenous dispersion of CNTs and Al2O3 nanoparticles(NPs)at 12 h of milling which resulted in the formation of high density of dislocations and extensive grain size *** both longitudinal and shear velocities and attenuation increase linearly by increasing Al2O3 content and milling *** variation of ultrasonic velocity and attenuation was attributed to the degree of dispersion of CNTs and Al2O3 and also less inter-particle spacing in the *** larger Al2O3 content and more homogenous dispersion of CNTs and Al2O3 NPs at longer milling time exerted higher velocity and attenuation of ultrasonic wave.

关键词： hybrid composite aluminum composites powder metallurgy microwave sintering microstructure mechanical properties ultrasonic velocity ultrasonic attenuation

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