Browsing by Author Zaazou, Mohamed H.

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  • Authors: Omar, Nada;  Advisor: -;  Participants: Ismail, Amira Galal; Galal, Manar; Zaazou, Mohamed H.; Mohamed, Mohamed Abdullah (2019)

  • Finite element analysis was used to evaluate the stress distribution, estimate the residual stresses, bending, and amount of displacement of two nickel-titanium instruments manufactured by the same M-wire technology but with different cross-section. The WaveOne file showed higher torsional stresses accumulation than those accumulated in the ProTaper NEXT. While the ProTaper NEXT showed more bending and file displacement than those showed by WaveOne file.

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  • Authors: Aly, Yousra;  Advisor: -;  Participants: Omar, Nada; Kataia, Engy M.; Khallaf, Maram E.; Zaazou, Mohamed H. (2021)

  • Regarding the evaluation of the ease of removal of the intracanal medicaments after irrigation: apically, the Ca(OH)2 recorded the highest mean value of the residual remnants with a statistically significant difference with both Moringa oleifera leaf and root. The microhardness evaluation results showed that all groups showed increase in the microhardness after application of the intracanal medicament for 1 week with no statistically significant difference between them.

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  • Authors: Riad, Hoda R.;  Advisor: -;  Participants: Mosallam, Osama S.; Salama, Alaa H.; Moharam, Lamiaa M.; Zaazou, Mohamed H.; Niazi, Hanan A.; Ibrahim, Mokhtar N. (2021)

  • NovaMin-containing toothpaste showed an increased dentin surface microhardness following a week of twice daily brushing compared to other groups. However, NovaMin-containing toothpaste showed the highest microhardness values following pH cycling with citric acid of pH 5 compared to other tested groups.

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  • Authors: Nagi, Shaymaa M.;  Advisor: -;  Participants: Nabil, Shahinaz H.; Zaazou, Mohamed H. (2021)

  • Group B showed the highest mean calcium, phosphorus and sodium weight percent (wt%). Both Groups B and C showed statistically significant difference. While, there was no statistically significant difference between both Groups A and B.The sodium mean wt% showed a statistically significant difference in all groups. The magnesium mean wt% showed no statistically significant difference in all groups. SEM photomicrograph revealed hollowing of prism cores with intact prisms peripheries for group A. Group B showed relativity smooth surface with minor pores, while Group C showed an increase in the depth of surface irregularities and depressions.

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  • Authors: Ismail, Amira Galal;  Advisor: -;  Participants: Galal, Manar; Zaazou, Mohamed H.; Hamd, Tamer M.; Hamd, Tamer M.; Abdelraouf, Rasha M. (2020)

  • Flexibility during bending is a critical feature that influences the performance and safety of endodontic nickel-titanium rotary instruments. Flexibility of the endodontic files could be assessed via laboratory test or indicated theoretically by finite element analysis (FEA). The aim of the study is to determine the cantilever load required for bending five different nickel-titanium (NiTi) rotary instruments (laboratory test) and to calculate maximum von Mises stresses due to bending moment and vertical displacement (deflection) (theoretically by FEA) and compare both results.

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  • Authors: Taher, Ragia M.;  Advisor: -;  Participants: Moharam, Lamiaa M.; Amin, Amin E.; Zaazou, Mohamed H.; El-Askary, Farid S.; Ibrahim, Mokhtar N. (2021)

  • For DC%, there was no significant difference between no-radiation exposure and radiation exposure (P > 0.05). Herculite XRV Ultra revealed the highest statistically significant DC% (P < 0.05). The 24-h storage time revealed the least significant DC% (P < 0.05). For FS, radiation exposure showed a statistically significant higher value compared to no-radiation exposure (P < 0.05). Herculite XRV Ultra showed the least FS value (P < 0.05). The 24-h storage time showed the highest significant value (P < 0.05).