Evaluation of Flexibility, Microstructure and Elemental Analysis of Some Contemporary Nickel-Titanium Rotary Instruments

Authors

  • Tamer M. Hamdy Restorative and Dental Materials Department, National Research Centre (NRC), El Bohouth St., 12622 Dokki, Giza, Egypt
  • Manar Galal Restorative and Dental Materials Department, National Research Centre (NRC), El Bohouth St., 12622 Dokki, Giza, Egypt
  • Amira Galal Ismail Restorative and Dental Materials Department, National Research Centre (NRC), El Bohouth St., 12622 Dokki, Giza, Egypt
  • Rasha M. Abdelraouf Faculty of Dentistry, Cairo University, Cairo, Egypt

DOI:

https://doi.org/10.3889/oamjms.2019.811

Keywords:

NiTi instruments, endodontic files, flexibility, microstructure, elemental analysis, heat treatment

Abstract

BACKGROUND: Contemporary nickel-titanium (NiTi) rotary endodontic instruments had a revolutionary impact on the success of root canal treatment.

AIM: To evaluate the flexibility, microstructure and elemental analysis of four different recent NiTi rotary instruments, namely; Wave One Gold, TF adaptive, HyFlex EDM and Gr_Reciproc Blue compared to conventional Protaper Universal (F2).

MATERIAL AND METHODS: The NiTi rotary files were subjected to cantilever bending test to evaluate their flexibility. The microstructural characteristics and elemental analysis were examined via scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDX).

RESULTS: The TF adaptive, HyFlex EDM and Wave One Gold endodontic files showed significantly lower cantilever bending values (i.e., higher flexibility) than Protaper F2 and Gr_Reciproc Blue (p < 0.05). The SEM micrographs showed that the bulk of all examined files showed multiple striations due to the cutting process, on the other hand, their external surfaces were different: The Protaper Universal F2 showed multiple voids, while the TF Adaptive surface exhibited more uniform structure. The Hyflex EDM had a crater-like surface, whereas Wave one Gold showed machining grooves with minimum defects, while Reciproc Blue displayed machining grooves with random scratch lines. There was a significant difference in bulk and surface elemental analysis of the various examined files, yet composed mainly of the same elements.

CONCLUSION: Chemical composition, heat treatment, manufacturing process and geometrical design of the NiTi rotary instrument have a great influence on their flexibility and microstructure.

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Published

2019-10-13

How to Cite

1.
Hamdy TM, Galal M, Ismail AG, Abdelraouf RM. Evaluation of Flexibility, Microstructure and Elemental Analysis of Some Contemporary Nickel-Titanium Rotary Instruments. Open Access Maced J Med Sci [Internet]. 2019 Oct. 13 [cited 2024 Mar. 28];7(21):3647-54. Available from: https://oamjms.eu/index.php/mjms/article/view/oamjms.2019.811

Issue

Section

D - Dental Sciences

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