NITI file ( endodontic instrument ) uses and safety tips
Design & Structure
NiTiflex-files are manufactured from nickel-titan wire that is ground to give the typical profile of a K-file. The angle between the long-axis and the cutting blade is bigger than in reamers, and therefore preparation by NiTiflex-file is effective both in rotating motion and in filing motion (up and down movement).
The tip of the instrument is non-cutting (‘bat-tip’) which makes the NiTiflex-file well suited for the preparation of curved canals without the risk of ledge formation.
Sizes & Codes
NiTiflex-files come in sizes 15 – 60, all with a taper of 0.02. K-file design is identified by the square symbol on the handle.
NiTiflex-files can be best distinguished from normal K-files by the code that in NiTiflex-files is printed with two colors.
NiTiflex-file is suited to be used both in straight canals as well as in curved canals. The NiTiflex-file prepares dentin both in filing motion (up and down) and when rotated. In curved canals the recommended techniques are continuous rotation when the resistance is small and balanced force against greater resistance. Use of balanced force instead of continuous rotation is easier because of the K-file design, which causes a screwing effect in continuous rotation. The use of filing motion in curved canals can cause transportation and ledging, and is not recommended.
NiTiflex-files can be rotated only using moderate pressure. Use of force may result in fracture also with bigger sized instruments. NiTiflex-files are super-elastic and always return to their original shape (= elastic memory), which makes it difficult or impossible to detect weakened structure by visual observation. Fracture risk is best controlled by correct use and by using the instrument no more than ten times.
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