Ashraf Amin

Zhengzhou University

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Co-Authors

William S. Epling

University of Virginia

Eric Croiset

University of Waterloo

Mona A. Abdel‐Fatah

National Research Centre

Heba Abdallah

National Research Centre

Ghada A. Al Bazedi

American University in Cairo

G. El Diwani

National Research Centre

Zuhair Malaibari

King Fahd University of Petroleum and Minerals

N.N. El-Ibiari

National Research Centre

Anis H. Fakeeha

King Saud University

Abdelrahman G. Gadallah

Imam Mohammad ibn Saud Islamic University

Cooperative Institutions

National Research Centre

National Water Research Center

Universidade Federal de Santa Catarina

University of Waterloo

King Saud University

University of Technology Malaysia

Sharda University

Universidade Federal da Fronteira Sul

Riyadh Elm University

Zhengzhou University

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Dental Procedures: Is it a Risk Factor for Injectable Dermal Fillers?

Journal of Maxillofacial and Oral Surgery (2012)

A Ramzi Maysoun Kassim Joju George Ashraf Amin

Filler (materials)

Incision and drainage

Cosmetic dentistry

10.1007/s12663-012-0398-y

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Citations (20)

Shear Bond Strength of Pulp Capping Materials to Dentin After One Day: MTA versus Bio-Dentin

Egyptian Dental Journal /Egyptian Dental Journal (2023)

Ashraf Amin Mona Hafez

Aim of the study: evaluate and compare shear bond strength of MTA and Bio-Dentin to dentin after one day.Materials and Methods: Thirty upper premolars were selected and sectioned1 mm above the level of pulp horns to expose much dentin, specimens were randomly assigned into three groups, n=10 each.MTA, Bio-Dentin and calcium hydroxide (control) were mixed then filled in tubes [diameter & height = 3mm] then applied on dentin surfaces.After one day, the shear bond strength was tested using a universal testing device.A Stereo microscope was used to assess failure modes.Results: After one day, setting of these capping materials, shear bond strength of MTA and Bio-Dentin were significantly different from that of calcium hydroxide.However, shear bond strength of MTA and Bio-Dentin were not significantly different.Calcium hydroxide showed 100% adhesive failure, Bio-Dentin showed 12% mixed failure while MTA showed 15% mixed failure. Conclusion:After one day setting, MTA and Bio-Dentin showed shear bond strength higher than that of Calcium Hydroxide with some precedence to Bio-Dentin.

Pulp capping

Dentin Bonding Agents

Shear Strength

10.21608/edj.2023.180041.2372

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The role of energetic ion bombardment during growth of TiO₂ thin films by reactive sputtering

Journal of Physics D Applied Physics (2010)

Ashraf Amin D. Köhl Matthias Wuttig

TiO 2 thin films have been deposited by several different sputtering processes: (i) dc magnetron sputtering (dcMS) employing various geometrical conditions, (ii) ion-assisted dc magnetron sputtering where additional ion bombardment of the growing films was performed with an auxiliary ECR ion source and (iii) high power impulse magnetron sputtering (HiPIMS). Films have been investigated mainly by grazing incidence x-ray diffraction and atomic force microscopy. It is shown that the highly energetic oxygen ions inherent in reactive sputtering of metal oxides are the dominant energetic species governing structure formation of TiO 2 films by their kinetic impact. The trajectories of these energetic oxygen ions strongly depend on the shape of the erosion trace and hence on the age of the target, which therefore has a strong influence on structure formation. Furthermore, in a HiPIMS discharge the role of this energetic oxygen ion bombardment is strongly intensified due to the increased target voltage and the lower deposition rate compared with a dcMS discharge. It is also demonstrated that films with pure rutile structure which are stable under a post-deposition thermal treatment can be deposited under intense energetic ion bombardment at low temperatures either by HiPIMS at high peak power densities or by ion-assisted dcMS.

10.1088/0022-3727/43/40/405303

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Citations (58)

Articaine 4% containing 1% magnesium sulphate versus articaine 4%for inferior alveolar nerve block in cases with irreversible pulpitis: randomized clinical study

Advanced Dental Journal (2023)

Ashraf Amin Mosaad Khalifah

Aim: to access the success rate of inferior alveolar nerve block (IANB) with 4% articaine (1/100000 epinephrine) containing 1% magnesium sulphate (MgSO4) in cases suffering from acute irreversible pulpitis (AIP) related to mandibular molars.Subjects & methods: 50 patients suffering from (AIP) were carefully selected, then divided into two groups, the first one (control) injected with 1.8 ml articaine (1/100000 epinephrine) by IANB while the second group (Test) injected with 1.8 ml articaine (1/100000 epinephrine -1% MgSO4).Lip numbness was considered a check for anesthetic success within 15 minutes.During the access cavity preparation and initial files placement, the pain scores were recorded according to Heft Parker Visual Analog Scale HP-VAS, Success was defined as the ability to access and instrument the tooth without pain (visual analogue scale rating of 0) or mild pain (visual analogue scale rating less than or equal to 54 mm).Then all data were analyzed by Chi-Square and T-Test, comparisons were considered significant if P < .05.Results: the success of the test group (MgSO4 group) was 85% while it was 55% for the control one.Conclusion: mixing 4% articaine (1/100000 epinephrine) with 1% MgSO4 had a positive effect on IANB success in patients with (AIP) related to the mandibular molars.

Articaine

Inferior alveolar nerve

Pulpitis

10.21608/adjc.2023.176993.1200

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Comparing the retreatability of bioceramic sealer to resin sealer using rotational instrumentation supplemented by irrigant activation: A laboratory-based micro-computed tomography

Egyptian Dental Journal /Egyptian Dental Journal (2023)

Ashraf Amin

Using micro-computed tomography for assessment, this study examined the retreatability of filling materials from canals filled with Total Fill bioceramic sealer (FKG Dentaire, La Chaux de Fonds, Switzerland) and Dia-ProSeal epoxy resin-based sealer (Dia dent, Korea) sealing a guttapercha core.According to the sealer utilized, 30 mandibular premolars were randomly allocated into two groups.Canals were retreated two weeks following obturation using Fanta retreatment kit (FANTA dental materials, China).The length of time required for retreatment was listed.After obturation, retreatment and irrigant activation (XP endo finisher R), the roots were scanned.The Wilcoxon & Mann-Whitney tests were used to assess the data.In comparison to canals filled with Dia-ProSeal, Total Fill bioceramic sealer canals showed considerably less residual filling material (P< 0.05).The remaining material in both groups significantly decreased with irrigant activation (P< 0.05).The Dia-ProSeal group was found to have considerably less retreatment time than Total Fill bioceramic sealer group (P< 0.05).

Bioceramic

Instrumentation

10.21608/edj.2023.207006.2524

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Nanosized Ni/SBA-15 Catalysts for CO2 Reforming of CH4

Applied Sciences (2019)

Ahmed A. Ibrahim Ashraf Amin Ahmed S. Al‐Fatesh Nadavala Siva Kumar Samsudeen Olajide Kasim

Ni, Co, and Co–Ni bimetallic catalysts supported over SBA-15 and over SBA-15 doped with Zn or Ce oxides were prepared and tested in a methane dry reforming reaction. The loading of the metals in the catalyst was 5 wt % for either mono or bimetallic catalysts. The prepared catalysts were tested in a continuous-flow fixed-bed reactor at 800 °C under atmospheric pressure. XRD, TPR, TPD, and SEM characterization techniques were employed to investigate the catalytic properties of fresh catalysts. SEM and TGA were used to study the catalytic properties of spent catalysts. A remarkable effect on the reduction properties and catalytic performance of catalysts was observed after adding Zn and Ce. Over an 8 h test, Ni/SBA-15 showed the best activity and stability. The conversion was 90% for CH4 and CO2. Co–Ni/SBA-15 and Co–Ni/Ce–SBA-15 have shown a reasonable activity and stability. Selectivity of the Ni/SBA-15 catalyst was higher than all other catalysts as indicated by the H2/CO ratio. Co/SBA-15 and Co–Ni/Zn–SBA-15 showed a low activity and selectivity. TPD–NH3 profiles indicated that doping SBA-15 with Ce and/or Zn increased the catalyst acidic sites. Ni/SBA-15 is an excellent potential catalyst for commercial methane dry reforming processes.

Bimetallic strip

Carbon dioxide reforming

10.3390/app9091926

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Citations (22)

Bearing Capacity and Strength of Fibre-Reinforced Sand: Experimental and Parametric Study

International Journal of Civil Infrastructure (2023)

Ruba Elmootassem Haitham A. Badrawi Magdi Elemam Ashraf Amin

In this paper, Polyolefin fibre which is produced from simple olefin (CnH2n) was mixed with dry sand to investigate the shear strength improvement of the admixture.Specimens with 0.5%, 1%, 1.5% and 2% fibre contents with yarns lengths of 15 mm and 30 mm are prepared in repeatable steps and tested in direct shear tests.Bearing capacity of hypothetical footing resting on ground surface of the tested fibre-reinforcedsand was estimated using Terzaghi's bearing capacity equation.Moreover, a parametric study includes thickness of reinforced layer, depth of foundation, and fibres content percent is conducted.In the parametric study, the continuous footing was analysed using procedures estimating the bearing capacity of layered soils.Results of shear strength tests indicated that, the inclusion of randomly distributed discrete fibres significantly improved the shear strength of sand.The optimum fibre percentage for improving both friction angle was about 1%.Adding fibre more than this ratio resulted in a significant reduction in soil shear strength parameters.The effect of fibre on sand apparent tensile cohesion is more pronounced compared to its effect on the friction angle.The parametric study indicates that having a continuous footing resting on a soil layer reinforced with 30 mm artificial fibres at 0.5% content provides the highest ultimate bearing capacity.Finally, the thickness of the reinforced layer and the depth of the foundation are among the parameters that affect bearing capacity.

Load bearing

10.11159/ijci.2023.004

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Investigation of polyvinylchloride and cellulose acetate blend membranes for desalination

Journal of Molecular Structure (2017)

Ayman El‐Gendi Heba Abdallah Ashraf Amin Sh.K. Amin

Phase inversion

Cellulose acetate

10.1016/j.molstruc.2017.05.122

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Citations (46)