The Experts below are selected from a list of 3423 Experts worldwide ranked by ideXlab platform
Jiang Chang - One of the best experts on this subject based on the ideXlab platform.
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A study on the sealing ability and antibacterial activity of Ca3SiO5/CaCl2 Composite Cement for dental applications.
Dental Materials Journal, 2012Co-Authors: Xiaohong Wang, Jiang Chang, Sheng HuAbstract:The objective of this study was to evaluate the sealing ability and antibacterial activity of Ca3SiO5/CaCl2 Composite Cement. Fifty maxillary anterior teeth were instrumented according to step-back technique and filled with experimental and control materials. To evaluate the sealing ability, a fluid transport model using glucose was employed for quantitative analysis of endodontic microleakage. To evaluate antibacterial activity, E. colias (ATCC 25922) was cultivated on agar plates. Results showed that the sealing ability of Ca3SiO5/CaCl2 Composite Cement and cortisomol paste were higher than that of zinc oxide-eugenol (ZOE) Cement, and that no significant difference was observed between Ca3SiO5/CaCl2 Composite Cement and cortisomol paste. On antibacterial activity, Ca3SiO5/CaCl2 Composite Cements composed of varying amounts of CaCl2 (0-15%) exhibited similar levels of activity against E. coliasas calcium hydroxide Cement, whereas cortisomol paste had little effect on E. colias. All these results suggested that Ca3SiO5/CaCl2 Composite Cement demonstrated good potential for root canal treatment applications.
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Characterization of Ca3SiO5/CaCl2 Composite Cement for dental application
Dental Materials, 2008Co-Authors: Xiaohong Wang, Hongchen Sun, Jiang ChangAbstract:Objectives: The purpose of this study was to investigate the effect of CaCl2 on the setting time, pH values and compressive strength of tricalcium silicate, and the in vitro bioactivity and compatibility of Ca3SiO5/CaCl2 Composite paste was also studied to explore the possibility for using as a root canal filling material. Methods: Composite Cements were obtained by mixing Ca3SiO5 and different amounts of CaCl2 (0, 5%, 10% and 15%) with deionized water as liquid phase. The Composite Cement and pure tricalcium silicate were compared for setting time, pH value, compressive strength, in vitro bioactivity and compatibility. Results: With the addition of CaCl2 from 0% to 15%, the initial setting time and final setting time decreased obviously from 90 to 50 min and from 180 to 90 min, respectively. The compressive strength of the Ca3SiO5/CaCl2 Composite Cement after setting for 7 days increased obviously from 5.28 to 23.46 MPa when the content of CaCl2 increased from 0% to 10%. Furthermore, the paste with up to 15% of CaCl2 showed good ability to induce the formation of hydroxyapatite (HA), and the dissolution extracts of the Ca3SiO5/CaCl2 Composite paste also have a stimulatory effect on L929 cell proliferation in a certain concentration range. Significance: The results indicated that the Ca3SiO5/CaCl2 Composite Cement had good self-setting properties, bioactivity and compatibility, and may be used as a novel root canal filling material. © 2007 Academy of Dental Materials.
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Characterization of Ca3SiO5/CaCl2 Composite Cement for dental application
Dental Materials, 2007Co-Authors: Xiaohong Wang, Jiang ChangAbstract:Abstract Objectives The purpose of this study was to investigate the effect of CaCl 2 on the setting time, pH values and compressive strength of tricalcium silicate, and the in vitro bioactivity and compatibility of Ca 3 SiO 5 /CaCl 2 Composite paste was also studied to explore the possibility for using as a root canal filling material. Methods Composite Cements were obtained by mixing Ca 3 SiO 5 and different amounts of CaCl 2 (0, 5%, 10% and 15%) with deionized water as liquid phase. The Composite Cement and pure tricalcium silicate were compared for setting time, pH value, compressive strength, in vitro bioactivity and compatibility. Results With the addition of CaCl 2 from 0% to 15%, the initial setting time and final setting time decreased obviously from 90 to 50 min and from 180 to 90 min, respectively. The compressive strength of the Ca 3 SiO 5 /CaCl 2 Composite Cement after setting for 7 days increased obviously from 5.28 to 23.46 MPa when the content of CaCl 2 increased from 0% to 10%. Furthermore, the paste with up to 15% of CaCl 2 showed good ability to induce the formation of hydroxyapatite (HA), and the dissolution extracts of the Ca 3 SiO 5 /CaCl 2 Composite paste also have a stimulatory effect on L929 cell proliferation in a certain concentration range. Significance The results indicated that the Ca 3 SiO 5 /CaCl 2 Composite Cement had good self-setting properties, bioactivity and compatibility, and may be used as a novel root canal filling material.
Xiaohong Wang - One of the best experts on this subject based on the ideXlab platform.
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A study on the sealing ability and antibacterial activity of Ca3SiO5/CaCl2 Composite Cement for dental applications.
Dental Materials Journal, 2012Co-Authors: Xiaohong Wang, Jiang Chang, Sheng HuAbstract:The objective of this study was to evaluate the sealing ability and antibacterial activity of Ca3SiO5/CaCl2 Composite Cement. Fifty maxillary anterior teeth were instrumented according to step-back technique and filled with experimental and control materials. To evaluate the sealing ability, a fluid transport model using glucose was employed for quantitative analysis of endodontic microleakage. To evaluate antibacterial activity, E. colias (ATCC 25922) was cultivated on agar plates. Results showed that the sealing ability of Ca3SiO5/CaCl2 Composite Cement and cortisomol paste were higher than that of zinc oxide-eugenol (ZOE) Cement, and that no significant difference was observed between Ca3SiO5/CaCl2 Composite Cement and cortisomol paste. On antibacterial activity, Ca3SiO5/CaCl2 Composite Cements composed of varying amounts of CaCl2 (0-15%) exhibited similar levels of activity against E. coliasas calcium hydroxide Cement, whereas cortisomol paste had little effect on E. colias. All these results suggested that Ca3SiO5/CaCl2 Composite Cement demonstrated good potential for root canal treatment applications.
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Characterization of Ca3SiO5/CaCl2 Composite Cement for dental application
Dental Materials, 2008Co-Authors: Xiaohong Wang, Hongchen Sun, Jiang ChangAbstract:Objectives: The purpose of this study was to investigate the effect of CaCl2 on the setting time, pH values and compressive strength of tricalcium silicate, and the in vitro bioactivity and compatibility of Ca3SiO5/CaCl2 Composite paste was also studied to explore the possibility for using as a root canal filling material. Methods: Composite Cements were obtained by mixing Ca3SiO5 and different amounts of CaCl2 (0, 5%, 10% and 15%) with deionized water as liquid phase. The Composite Cement and pure tricalcium silicate were compared for setting time, pH value, compressive strength, in vitro bioactivity and compatibility. Results: With the addition of CaCl2 from 0% to 15%, the initial setting time and final setting time decreased obviously from 90 to 50 min and from 180 to 90 min, respectively. The compressive strength of the Ca3SiO5/CaCl2 Composite Cement after setting for 7 days increased obviously from 5.28 to 23.46 MPa when the content of CaCl2 increased from 0% to 10%. Furthermore, the paste with up to 15% of CaCl2 showed good ability to induce the formation of hydroxyapatite (HA), and the dissolution extracts of the Ca3SiO5/CaCl2 Composite paste also have a stimulatory effect on L929 cell proliferation in a certain concentration range. Significance: The results indicated that the Ca3SiO5/CaCl2 Composite Cement had good self-setting properties, bioactivity and compatibility, and may be used as a novel root canal filling material. © 2007 Academy of Dental Materials.
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Characterization of Ca3SiO5/CaCl2 Composite Cement for dental application
Dental Materials, 2007Co-Authors: Xiaohong Wang, Jiang ChangAbstract:Abstract Objectives The purpose of this study was to investigate the effect of CaCl 2 on the setting time, pH values and compressive strength of tricalcium silicate, and the in vitro bioactivity and compatibility of Ca 3 SiO 5 /CaCl 2 Composite paste was also studied to explore the possibility for using as a root canal filling material. Methods Composite Cements were obtained by mixing Ca 3 SiO 5 and different amounts of CaCl 2 (0, 5%, 10% and 15%) with deionized water as liquid phase. The Composite Cement and pure tricalcium silicate were compared for setting time, pH value, compressive strength, in vitro bioactivity and compatibility. Results With the addition of CaCl 2 from 0% to 15%, the initial setting time and final setting time decreased obviously from 90 to 50 min and from 180 to 90 min, respectively. The compressive strength of the Ca 3 SiO 5 /CaCl 2 Composite Cement after setting for 7 days increased obviously from 5.28 to 23.46 MPa when the content of CaCl 2 increased from 0% to 10%. Furthermore, the paste with up to 15% of CaCl 2 showed good ability to induce the formation of hydroxyapatite (HA), and the dissolution extracts of the Ca 3 SiO 5 /CaCl 2 Composite paste also have a stimulatory effect on L929 cell proliferation in a certain concentration range. Significance The results indicated that the Ca 3 SiO 5 /CaCl 2 Composite Cement had good self-setting properties, bioactivity and compatibility, and may be used as a novel root canal filling material.
Mohamed Heikal - One of the best experts on this subject based on the ideXlab platform.
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Hydration, microstructure and phase composition of Composite Cements containing nano-clay
Construction and Building Materials, 2016Co-Authors: Mohamed Heikal, N.s. IbrahimAbstract:Abstract The effect of partial replaCement of ordinary Portland Cement (OPC) with nano-clay (NC) on the performance of physico-chemical, mechanical, hydration characteristics and microstructure of Composite Cement pastes containing ordinary Portland Cement (OPC) and ground blast-furnace slag (GBFS) was studied. Initial and final setting times are accelerated by the partial replaCement of OPC with NC. The values of compressive strength, bulk density, chemically combined water content and gel/space ratio of Composite Cement pastes increase by using NC up to 6 mass%, then decrease by further replaCement up to 8 mass%. The free lime contents of Composite Cement pastes increase from 1 day up to 3 days, then decrease from 7 days up to 90 days. NC activates the hydration reaction of OPC and GBFS. SEM micrograph of mix M4S40 (54% OPC + 6% NC + 40% GBFS + 1%SP) deposits the presence of micro- and nano-crystalline CSH gel with dense interlocking close linkage structure composed mainly of larger crystalline hydrates. It can be concluded that 6 mass% NC is the optimum replaCement level.
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Microstructure of Composite Cements containing blast-furnace slag and silica nano-particles subjected to elevated thermally treatment temperature
Construction and Building Materials, 2015Co-Authors: Mohamed Heikal, O.k. Al-duaij, N.s. IbrahimAbstract:Abstract This paper aims to study the effect of thermally treatment temperatures on Composite Cements containing nano-silica (NS) and blast-furnace slag (GBFS). The Composite Cements are composed of NS from 0, 1 and 4 mass% and GBFS from 0, 25, 50 and 65 mass%. The thermal resistance of Composite Cement pastes was studied after the specimens subjected to thermal treatment at 200, 400, 650, 850 and 950 °C, with rate of heating 5 °C/min for 2 h soaking time. The compressive strength, apparent density and total porosity of Composite Cement pastes were determined. Substitution of OPC with 25–50% GBFS in the presence of silica-nano-particles improves the fire resistance of Composite Cement pastes up to 650 °C. The relative compressive strength of unsuperplasticized mixes containing 25, 50 and 65 mass% GBFS (M25, M50 and M65 mixes) were 101.34–109.76%, 113.67–120.98%, 79.55–96.67%, 37.06–41.47% and 12.35–23.08%, whereas the relative compressive strength of superplasticized M25S, M50S and M65S mixes were 109.71–149.02%, 116.71–153.92%, 104.23–143.13%, 77.35–95.40% and 24.47–38.24% for samples thermally treated at 200, 400, 650, 850 and 950 °C. It can be concluded that superplasticized Cement pastes made with 50 mass% in the presence of 4 mass% NS have higher thermal resistance up to 650 °C.
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Behavior of Composite Cement pastes containing silica nano-particles at elevated temperature
Construction and Building Materials, 2014Co-Authors: Mohamed Heikal, M. Ismail, S. Awad N.s. IbrahimAbstract:Abstract The work aims to study the effect of substitution of nano-silica (NS) on the behavior of Composite Cement pastes containing ordinary Portland Cement (OPC) and blast-furnace slag (GBFS) exposed to elevated temperature up to 1000 °C. The Composite Cements are composed of different amount of NS up to 6 mass% as well as 30–60 mass% GBFS. The behavior of hydration kinetics were studied for 1, 3, 7, 28 and 90 days. The fire resistance of Composite Cement pastes was evaluated for specimens cured for 28 days after firing at 250, 450, 600, 800 and 1000 °C with rate of heating 3 °C/min for 3 h soaking time, then cooled to room temperature in the furnace switched off. The compressive strength of OPC–NS and/or GBFS Cement pastes increase with NS content up to 4%. Increases of the contents of NS up to 6% the values of compressive strength of OPC–NS Cement pastes decreases. Gel/space ratio of OPC–GBFS–NS containing 4 mass% NS shows an increase with the increase of GBFS up to 40 mass% (mix IV.2). The compressive strength of III.2 and IV.2 show higher values at all thermally treatment temperature up to 1000 °C. The compressive strength of the superplasticized OPC–NS–GBFS Composite shows a higher values up to 1000 °C in comparison with those pastes. It can be included that 30–60% GBFS in the presence of 4 mass% NS has a higher resistance to fire than all Composite Cement pastes.
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Behavior of Composite Cement pastes containing microsilica and fly ash at elevated temperature
Construction and Building Materials, 2013Co-Authors: Mohamed Heikal, Tarek M Sokkary, H. El-didamony, I. A .ahmedAbstract:Abstract The work aims to study the effect of substitution of micro-silica (SF) and fly ash (FA) on the behavior of Composite Cement pastes exposed to elevated temperature. The Composite Cements are composed of 80 mass% OPC with variable amounts of SF and/or FA. The fire resistance of Composite Cement pastes was evaluated after firing at 250, 450, 600, and 800 °C with rate of heating 3 °C/min for 3 h soaking time. The physico-mechanical characteristics such as total porosity, bulk density and compressive strength of Cement pastes were determined at each firing temperature. Moreover, the phase composition, free lime and microstructure for some selected samples were investigated. Cement pastes containing 10 and 15 mass% have higher firing resistance than all SF-pozzolanic Cement pastes at 600 °C. It can be also, concluded that the Composite Cement pastes made from 10% of SF and 10% FA have good fire resistance in comparison with Cement pastes made from only SF-pozzolanic Cement pastes up to 450 °C.
Jinhui Peng - One of the best experts on this subject based on the ideXlab platform.
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effects of compound chemical activators on the hydration of low carbon ferrochrome slag based Composite Cement
Journal of Environmental Management, 2017Co-Authors: Xintao Zhou, Xutao Hao, Zhongqiu Luo, Mingqin Zhang, Jinhui PengAbstract:Abstract Low-carbon ferrochrome slag (LCFS), a by-product of the ferrochrome alloy industry, has potential for use as a Cementitious material due to its pozzolanic characteristic. The objective of the present study was to determine the optimum compound chemical activators for LCFS-based Composite Cement using an orthogonal test, in which 7 d and 28 d compressive strengths were used as the evaluating indices. The influences of compound chemical activators on the hydration of a Composite Cement mix were investigated using X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS) and thermogravimetry-differential scanning calorimetry (TG-DSC). The optimum activator to activate the Composite Cement was a compound of NaCl (NC) at a dosage of 0.6%, Na 2 SO 4 (NS) at a dosage of 1.2%, NaF (NF) at a dosage of 0.6% and Al 2 (SO 4 ) 3 (AS) at a dosage of 0.9% or 0.7%. The compressive strengths of the optimum Composite Cement mix at ages of 3, 28 and 180 d increased by 50.1%, 22.4% and 16.5%, respectively. More hydration products including ettringite and calcium silicate hydrate were formed at an early age of hydration. The compound chemical activators effectively activated the ferrochrome slag (FS), blast-furnace slag (BFS) and fly ash (FA) in the Composite Cement.
Hongchen Sun - One of the best experts on this subject based on the ideXlab platform.
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Characterization of Ca3SiO5/CaCl2 Composite Cement for dental application
Dental Materials, 2008Co-Authors: Xiaohong Wang, Hongchen Sun, Jiang ChangAbstract:Objectives: The purpose of this study was to investigate the effect of CaCl2 on the setting time, pH values and compressive strength of tricalcium silicate, and the in vitro bioactivity and compatibility of Ca3SiO5/CaCl2 Composite paste was also studied to explore the possibility for using as a root canal filling material. Methods: Composite Cements were obtained by mixing Ca3SiO5 and different amounts of CaCl2 (0, 5%, 10% and 15%) with deionized water as liquid phase. The Composite Cement and pure tricalcium silicate were compared for setting time, pH value, compressive strength, in vitro bioactivity and compatibility. Results: With the addition of CaCl2 from 0% to 15%, the initial setting time and final setting time decreased obviously from 90 to 50 min and from 180 to 90 min, respectively. The compressive strength of the Ca3SiO5/CaCl2 Composite Cement after setting for 7 days increased obviously from 5.28 to 23.46 MPa when the content of CaCl2 increased from 0% to 10%. Furthermore, the paste with up to 15% of CaCl2 showed good ability to induce the formation of hydroxyapatite (HA), and the dissolution extracts of the Ca3SiO5/CaCl2 Composite paste also have a stimulatory effect on L929 cell proliferation in a certain concentration range. Significance: The results indicated that the Ca3SiO5/CaCl2 Composite Cement had good self-setting properties, bioactivity and compatibility, and may be used as a novel root canal filling material. © 2007 Academy of Dental Materials.