Browsing by Author "Abdelnabi, Ali"

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Effect of Amalgam Corroded Products on Quality of Hybrid Layer Using Etch and Rinse and Self-etch Adhesive Systems
(IJISET, 2019-05) Abdelnabi, Ali; Hamza, Nermeen
Amalgam and resin composite are two commonly used restorations in dental practice. Nowadays replacing the silver colored dental amalgam with the tooth colored composite has become a routine procedure. Amalgam ages in the oral environment leaving corrosive products that infiltrates into tooth structure and might interfere with bonding of resin composite to tooth on replacing amalgam with composite. In this study 40 molars were selected, cavities were made in each molar and filled with amalgam. Teeth were stored in distilled water for one year. After storage teeth were divided into two main groups; group A; where amalgam was removed without any further increase in cavity depth. Group B; where amalgam was totally removed followed by further increase in cavity depth by 0.5 mm. Each group was sub divided into 2 groups according to the adhesive system used in re-filling the cavities where sub group 1; cavities re-filled using self-etch adhesive and resin composite. Group 2 cavities re-filled with etch and rinse adhesive and resin composite ·Teeth examination: slicing of teeth was done, slices were examined using scanning electron microscope coupled with EDAX. The results of this study demonstrated that amalgam corrosive products interfered with bonding and that removal of 0.5 mm showed no corrosive remnants and allowed better adhesion for both adhesive systems used.
Effect of Different Formulations and Application Methods of Coral Calcium on its Remineralization Ability on Carious Enamel
(Open Access Macedonian Journal of Medical Sciences, 01/02/2020) Abdelnabi, Ali; Hamza, Mermen Kamal; El-Borady, Ola M.; Hamdy, Tamer M.
BACKGROUND: Coral calcium is a new biomimetic product and dietary supplement which consists mainly of alkaline calcium carbonate. AIM: The aim of the current study is to compare the remineralization effect of coral calcium in different formulations and application methods. METHODS: A total of 35 extracted molars was collected, examined, and sectioned to obtain 70 sound enamel discs, all specimens were examined for calcium mineral content using energy dispersive analysis of X-rays (EDAX) coupled with scanning electron microscope. Hydroxyapatite (HA) nanoparticles were synthesized through wet chemical precipitation approach and characterized by transmission electron microscopy (TEM) and Fourier transform infrared (FT-IR) analysis. Teeth specimens were subjected to demineralization, and mineral content was measured, specimens were divided into ten groups according to the remineralizing agent used, where Groups 1–3 used 10, 20, and 30 weight % (wt.%) coral calcium gel, respectively, Groups 4–6 used 10, 20, and 30 wt.% coral calcium and nanohydroxyapatite mix gel, and Groups 7–9 used 10, 20, and 30 wt.% coral calcium with argon laser activation and Group 10 (control group) without a remineralizing agent. All groups were re-examined by EDAX after remineralization. RESULTS: The TEM and FT-IR analysis confirmed the formation of rod shape HA in nanoparticles size range. All groups showed a statistically significant decrease in calcium level after demineralization, all groups showed a statistically significant increase in calcium content after remineralization except for the control group. Moreover, Groups 2 and 8 showed the highest increase in calcium level after remineralization. CONCLUSION: Coral calcium showed a significant remineralizing effect on carious enamel (demineralization) with an optimum concentration of 20 wt.%.
EVALUATION OF RE-MINERALIZATION OF INITIAL ENAMEL LESIONS USING NANOHYDROXYAPATITE AND CORAL CALCIUM WITH DIFFERENT CONCENTRATIONS
(EDJ, 2019-10) Abdelnabi, Ali; Hamza, Nermeen Kamal; Othman, Maha S.
Coral calcium is a boasting natural product and dietary supplement which is considered a source of alkaline calcium carbonate, this study is a comparative study, comparing the remineraliztion effect of the new product of coral calcium with that of nano hydroxyapatite. Methodology: a total of 35 extracted molars were collected, examined and sectioned to obtain 70 sound enamel discs, all discs were numbered and examined by scanning electron microscope coupled with Energy Dispersive Analysis of X-rays(EDAX) for mineral content, subjected to artificial caries and mineral content was re measured, discs were divided into 7 groups according to the remineralizing agent used, where groups 1 to 3 used 10, 20, 30 % nanohydroxyapatite gel respectively, groups 4 to 6 used 10, 20, 30 % coral calcium gel and group 7 with no reminieralizing agent (control group). All groups were re-examined by EDAX after remineralization, data were calculated and tabulated. Results: all groups showed statistically significant drop in calcium level after artificial caries, all groups showed statistically significant rise in calcium content after re mineralization except for the control group, groups 1 and 5 showed the highest increase in calcium level after re mineralization. Conclusion: coral calcium can be considered a comparative product to nano hydroxyapatite regarding re mineralization of enamel initial carious lesions.
Evaluation of Surface Properties of Two Remineralizing Agents after Modification by Chitosan Nano Particles: An In vitro Study
(Wolters Kluwer Medknow Publications, 2023-12) Wahied, Dina Mohamed; Ezzeldin, Naglaa; Abdelnabi, Ali; Othman, Maha Sherif; Abd El Rahman, Mai Hesham
Background: Calcium phosphate‑based systems have been introduced as promising bio‑mimetic materials due to their close resemblance to the enamel. Chitosan and its derivatives have been an emerging biomaterial due to their additional antibacterial effect and promising re‑mineralizing ability. Aim: The aim of this study is to evaluate the effect of chitosan nanoparticles on the remineralization of the demineralized enamel surface after being added to nano‑hydroxyapatite and nano‑calcium phosphate materials. Setting and Design: This was in vitro study. Materials and Methods: Twenty specimens of extracted permanent molars were collected, and then immersed in demineralizing solution, then distributed into four groups according to the remineralizing material. Group 1: Treated with Nano‑beta‑tricalcium phosphate (Nβ‑TCP) gel, Group 2: Treated with Nβ‑TCP with chitosan gel, Group 3: Treated with Nanohydroxyapatite (NHA) gel, and Group 4: Treated with NHA with chitosan gel. The surface hardness of the teeth was measured at baseline, after demineralization, and after remineralization. The structural changes in each group were analyzed using the scanning electron microscopy. Statistical Analysis: Shapiro–Wilk’s test, one‑way ANOVA followed by Tukey’s post hoc test was used. Results: In all groups, there was a significant difference in mean Vickers hardness number (VHN) at different intervals, with the highest value found after treatment (301.64–395.65) VHN, followed by the baseline (236.97–276.15) VHN, while the lowest value was detected after demineralization (121.23–124.39) VHN. It was also indicated that baseline treatment, the Hardness percentage change (%) of the nano NHA + Chitosan group showed the highest significant value (55.10%), while the Nβ‑TCP group exhibited the lowest significant value (9.56%). Conclusions: It can be concluded that NHA and NΒ‑TCP modified by chitosan NPs as remineralizing agents of enamel surface hold promising results.