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Browsing by Author Ismail, Amira Galal

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  • Assessment of cyclic fatigue resistance of Protaper Next and WaveOne Gold in different kinematics

    • Authors: Ismail, Amira Galal;  Advisor: -;  Participants: Galal, Manar; Roshdy, Nehal Nabil (2020)

  • Results represented that when using either continuous rotation motion or reciprocating motion, WOG files showed a significantly longer time until failure than PTN files (p < 0.001). The time till fracture increased significantly, when using both types of files with a reciprocating filing motion.
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  • Effect of different kinematics and operational temperature on cyclic fatigue resistance of rotary NiTi systems

    • Authors: Ismail, Amira Galal;  Advisor: -;  Participants: Galal, Manar; Nagy, Mohamed Mokhtar (2020)

  • The continuous rotation motion exhibited significantly lower cyclic fatigue resistance than reciprocating or adaptive motion (p ≤ 0.001) at 37 °C and 20 °C. Cyclic fatigue resistance of NiTi files was affected by the motion used during root canal preparation. Reciprocation motion and adaptive motion resulted in extended fatigue. The operational temperature affects the cyclic fatigue resistance of the twisted file.
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  • Finite element analysis comparing WaveOne Gold and ProTaper Next endodontic file segments subjected to bending and torsional load

    • Authors: Ismail, Amira Galal;  Advisor: -;  Participants: Zaazou, Mohamed Hussein Abdelfattah; Galal, Manar; Kamel, Nada Omar Mostafa; Nassar, Mohamed Abdulla (2019)

  • ProTaper Next® revealed higher flexibility than WaveOne Gold® when exposed to cantilever bending but showed higher stress accumulation than WOG. In terms of torsional resistance, PTN also revealed higher torsional resistance than WOG. The geometry of the instrument, thermomechanical treatment of the alloy, and its composition affect the mechanical behavior (bending and torsion) of nickel titanium rotary files. Hence, being aware of these behavioral differences, each clinician will be able to use the adequate file according to the clinical situation in addition to the manufacturer’s instructions.
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  • Relation between laboratory cantilever bending test and finite element analysis of five different nickel-titanium rotary instruments

    • 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.