A review of Nickel –titanium files based Metallurgy

kiumars nazari mioghadam | kiumars nazari moghadam

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=137131
Date :  2019/11/28
Publish in :    چهارمين سمپوزيوم انجمن اندودانتيستهاي ايران

Link :  http://4thsympendo.kmu.ac.ir/fa/
Keywords : Nickel –titanium file

Abstract :

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A review of Nickel –titanium files based Metallurgy Kiumars Nazari Moghadam, Associate of professor, Head of endodontics department Department of Endodontics, Dental School, Shahed University, Tehran, Iran. Technological advancements in field of NI-Ti metallurgy have enabled us to treat patients better than before . With advent of nickel–titanium alloys and the use of torque control motor for root canal preparation was a huge leap forward. Nevertheless, due to development of new files with different designs and structures and progression in NiTi alloy treatments, constantly seeking to obtain more resilient and flexible systems with less fracture .Many new motion have been implemented for root canal preparation with rotary files ,although reciprocating or combined motion shows the less risk of file separation. Recent studies shows that a considerable percentage of walls are never touched during root canal preparation with centric or reciprocating rotary files. Some studies revealed about 35-50 percentage of the root canal space remained untouched . Different stages of development from electropolishing ,M-wire heat treatment, R-phase manufacturing ,controlled-memory(CM), CM blue, Max-Wire have been brought in literature. The current literature shows tendency to the use of NiTi alloys with heat treatment and controlled memory, designed to increase the flexibility and reduce the shape-memory properties of files. In clinical practice, these files can be pre-bent and maintain this flexed shape, facilitating penetration at the entrance of the root canal. CM files also have a higher deformation capacity before fracture than conventional instruments, due to their greater flexibility and cyclic fatigue resistance. Many Ni-Ti rotary file systems have centric cross-section can cause less efficacy and file fracture due to debris accumulation occurs along side of the axis of file . Conversely, eccentric rotary motion, because it produces more balanced points of contact with the root dentin, contributes to greater instrument cyclic fatigue resistance and ensures greater contact with the canal walls. To date, there is still no endodontic file capable of meeting all of the requirements of an optimal root canal preparation. New materials and studies must be developed in the continued search for a system that can combine efficiency and safety in endodontic instrumentation In this lecture, we are going to give an overview of metallurgy of nickel titanium files from beginning to end A review of Nickel –titanium files based Metallurgy Kiumars Nazari Moghadam, Associate of professor, Head of endodontics department Department of Endodontics, Dental School, Shahed University, Tehran, Iran. Technological advancements in field of NI-Ti metallurgy have enabled us to treat patients better than before . With advent of nickel–titanium alloys and the use of torque control motor for root canal preparation was a huge leap forward. Nevertheless, due to development of new files with different designs and structures and progression in NiTi alloy treatments, constantly seeking to obtain more resilient and flexible systems with less fracture .Many new motion have been implemented for root canal preparation with rotary files ,although reciprocating or combined motion shows the less risk of file separation. Recent studies shows that a considerable percentage of walls are never touched during root canal preparation with centric or reciprocating rotary files. Some studies revealed about 35-50 percentage of the root canal space remained untouched . Different stages of development from electropolishing ,M-wire heat treatment, R-phase manufacturing ,controlled-memory(CM), CM blue, Max-Wire have been brought in literature. The current literature shows tendency to the use of NiTi alloys with heat treatment and controlled memory, designed to increase the flexibility and reduce the shape-memory properties of files.

http://4thsympendo.kmu.ac.ir/fa/