Browsing by Author "Fagr Hassan Elmergawy"

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    In vitro evaluation of human enamel remineralization after treatment with Ginger, Ashwaganda and Maca herbal dentifrices versus commercially available fluoride containing dentifrice
    (Springer International Publishing, 2025-03-03) Ghada Ahmed Elzayat; Fagr Hassan Elmergawy; Aya Abd ElFattah Mohammed Nemt Allah
    Background: Compare the remineralization efficiency of Ginger, Ashwaghanda and Maca dentifrices versus commercially fluoride containing dentifrice. Methods: Ginger, Ashwaghanda and Maca extracts were prepared by solvent extraction methodology and were characterized using transmission electron microscope, dynamic light scattering, and inductively coupled plasma optical emission spectrometer. The pH of the dentifrices was evaluated by pH meter. Eighty teeth were collected and divided into five groups according to the treatment protocol. Enamel morphology was carried out by scanning electron microscope with energy dispersive X-Ray spectroscopy for the analysis of calcium, phosphorus, Ca/P ratio and carbon. Surface microhardness was evaluated by Vickers micro-hardness tester. Data were analyzed using One-way ANOVA followed by Tukey’s post hoc test (p ≤ 0.05). Results: Characterization results showed the highest calcium, phosphorus and fluoride ion release were associated to Maca, Ashwaganda and Ginger respectively. The pH results revealed that Ginger dentifrice exhibited the most alkaline pH, whereas Ashwaganda dentifrice exhibited the most acidic pH. Morphological analysis revealed that Ashwaganda showed lower remineralization ability compared to the other treated groups. Maca showed significant higher Ca/P ratio compared to other groups (p < 0.001) and Ginger showed significant higher surface microhardness recovery compared to Ashwaganda (p < 0.001). Conclusion: Ginger and Maca are promising remineralizing agents.
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    In vitro evaluation of shear bond strength of polymethyl methacrylate/montmorillonite modified Biodentine with dental resin composite
    (Istanbul University Press, 2025-01-09) Fagr Hassan Elmergawy; Ola M. Elborady; Dina M. Wahied
    Purpose The aim of this study was to evaluate the bond strength between Biodentine, modified with polymethyl methacrylate/Montmorillonite nanoclay, and resin composite at different stages of Biodentine's setting time. Materials and Methods Nanoclay was prepared and organo-modified with polymethyl methacrylate. The characterization of polymethyl methacrylate/Montmorillonite nanoclay, Biodentine, and modified Biodentine was assessed by X-ray diffraction analysis, Fourier-transform infrared spectroscopy, and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. A total of sixty acrylic molds were constructed; thirty specimens were filled with Biodentine, and the other thirty with nanoclay-modified Biodentine. Each group was subdivided according to different stages of Biodentine's setting time: 12 minutes, 2 hours, and 2 weeks. Universal adhesive, followed by flowable resin composite, was applied. The microshear bond strength was tested using a universal testing machine. Data were analyzed using one-way ANOVA followed by Tukey’s post hoc test, in addition to two-way ANOVA. The significance level was set at p ≤ 0.05. Results The characterization results revealed the successful preparation of polymethyl methacrylate/Montmorillonite nanoclay and modified Biodentine. The micro-shear bond strength results showed that modified Biodentine had significantly higher micro-shear bond strength than unmodified Biodentine at 12 minutes. However, no statistically significant difference was found between the unmodified and modified Biodentine groups at 2 hours and 2 weeks. Conclusion The incorporation of 10% modified nanoclay by weight into Biodentine could enhance the bond strength with resin composite when placed after 12 minutes of Biodentine's setting time