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RISS 인기검색어
- 검색키워드
- 저자 : Abo-Mosallam, Hytham A. (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Abo-Mosallam, H.A.,Kim, D.A.,Kim, H.W.,Lee, H.H. Ceramurgica ; Elsevier Science Ltd 2016 Ceramics international Vol.42 No.4
The impact of ZrO<SUB>2</SUB> content of the glass on the formation, properties and crystallization of glass ionomer cements (GICs) was investigated. Glass series based on SiO<SUB>2</SUB>-Al<SUB>2</SUB>O<SUB>3</SUB>-ZrO<SUB>2</SUB>-P<SUB>2</SUB>O<SUB>5</SUB>-CaO-CaF<SUB>2</SUB> system was synthesized and studied. The cements were characterized using a setting time, flexural strength, fracture toughness and in vitro biocompatibility test. The setting time of the ionomer cement increased with increasing the ZrO<SUB>2</SUB> content of the glass. The cements showed a slight decrease of cell biocompatibility with increase the ZrO<SUB>2</SUB> oxide content in the glasses. The results also showed that the flexural strength and the fracture toughness of the cements increased with immersion time and ZrO<SUB>2</SUB> oxide content. The crystallization characteristics of the glasses were investigated by differential scanning calorimeter (DSC) and X-ray diffraction analysis (XRD). The addition of ZrO<SUB>2</SUB> oxide in the glasses led to increase both the glass transition and crystallization temperatures. Fluorapatite [Ca<SUB>5</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB>F], mullite [Al<SUB>6</SUB>Si<SUB>2</SUB>O<SUB>13</SUB>], cristobalite [SiO<SUB>2</SUB>] and zircon [ZrSiO<SUB>4</SUB>] phases were crystallized from the investigated glasses. The role played by the glass oxide constituents in determining the setting time, mechanical properties and crystallization characteristics of the prepared glass ionomer was discussed.
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Kim, D.A.,Abo-Mosallam, H.A.,Lee, H.Y.,Kim, G.R.,Kim, H.W.,Lee, H.H. Elsevier 2014 Materials science & engineering. C, Materials for Vol.42 No.-
The effects of strontium substitution for magnesium in a novel aluminum-free multicomponent glass composition for glass ionomer cements (GICs) were investigated. A series of glass compositions were prepared based on SiO<SUB>2</SUB>-P<SUB>2</SUB>O<SUB>5</SUB>-CaO-ZnO-MgO<SUB>(1-X)</SUB>-SrO<SUB>X</SUB>-CaF<SUB>2</SUB> (X=0, 0.25, 0.5 and 0.75). The mechanical properties of GICs prepared were characterized by compressive strength, flexural strength, flexural modules, and microhardness. Cell proliferation was evaluated indirectly by CCK-8 assay using various dilutions of the cement and rat mesenchyme stem cells. Incorporation of strontium instead of magnesium in the glasses has a significant influence on setting time of the cements and the properties. All mechanical properties of the GICs with SrO substitution at X=0.25 were significantly increased, then gradually decreased with further increase of the amount of strontium substitution in the glass. The GIC at X=0.25, also, showed an improved cell viability at low doses of the cement extracts in comparison with other groups or control without extracts. The results of this study demonstrate that the glass compositions with strontium substitution at low levels can be successfully used to prepare aluminum-free glass ionomer cements for repair and regeneration of hard tissues.
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Dong-Ae, KIM,Hany, ABO-MOSALLAM,Hye-Young, LEE,Jung-Hwan, LEE,Hae-Won, KIM,Hae-Hyoung, LEE Faculdade de Odontologia de Bauru da Universidade 2015 Journal of applied oral science Vol.23 No.4
<P>Some weaknesses of conventional glass ionomer cement (GIC) as dental materials, for instance the lack of bioactive potential and poor mechanical properties, remain unsolved. </P><P><B>Objective</B></P><P> The purpose of this study was to investigate the effects of the partial replacement of CaO with MgO or ZnO on the mechanical and biological properties of the experimental glass ionomer cements.</P><P><B>Material and Methods</B></P><P> Calcium fluoro-alumino-silicate glass was prepared for an experimental glass ionomer cement by melt quenching technique. The glass composition was modified by partial replacement (10 mol%) of CaO with MgO or ZnO. Net setting time, compressive and flexural properties, and <I>in vitro </I>rat dental pulp stem cells (rDPSCs) viability were examined for the prepared GICs and compared to a commercial GIC.</P><P><B>Results</B></P><P> The experimental GICs set more slowly than the commercial product, but their extended setting times are still within the maximum limit (8 min) specified in ISO 9917-1. Compressive strength of the experimental GIC was not increased by the partial substitution of CaO with either MgO or ZnO, but was comparable to the commercial control. For flexural properties, although there was no significance between the base and the modified glass, all prepared GICs marked a statistically higher flexural strength (p<0.05) and comparable modulus to control. The modified cements showed increased cell viability for rDPSCs.</P><P><B>Conclusions</B></P><P> The experimental GICs modified with MgO or ZnO can be considered bioactive dental materials.</P>
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Fouda, Abd El-Aziz. S.,Rashwan, Salah M.,Abo-Mosallam, Hytham A. Korean Chemical Society 2014 대한화학회지 Vol.58 No.1
Corrosion inhibition of 304 stainless steel (SS) in 1 M HCl by aqueous extract of coriander seeds was studied using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Values of inhibition efficiency obtained are dependent upon the concentration of extract and temperature. Generally, inhibition was found to increase with inhibitor concentration, but decrease with temperature. Physical adsorption mechanism has been proposed for the inhibition with Langmuir adsorption isotherm obeyed. Values of activation energy of the inhibited corrosion reaction of 304 SS are greater than the value obtained for the blank. Thermodynamic consideration reveals that adsorption of aqueous extract of coriander seeds 304 SS surface is spontaneous.
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