Dental Endo Niti Files

CICADA Medical’s endodontic hand files with large handles are supreme in China. The material used for NiTi files differs from that used for K-files, whereas the file form is the same on both.

Buy Dental Endo Niti Files Online At Best Price In China

The material used for NiTi files differs from that used for K-files, whereas the file form is the same on both. NiTi (Nickel-Titanium) is an elastic material, which will return to its original shape after bending or deformation. The instrument tip is not used for cutting, which makes CICADA Medical NiTi instruments ideal for the preparation of curved canals. Both a filing and rotating preparation motion are suitable for these instruments.

Every root canal preparation is different due to the morphology and different root canal paths. The NT-Endo system was developed to meet the requirements for handpiece root canal preparation according to the crown-down technique. The specially adapted blade geometry of the nickel-titanium instruments guarantees smooth, conically prepared root canals.

Canal perforations are excluded, even with unfavorable canal paths. The conical-radicular region is contoured using instruments with 6% conicity and the apical region is contoured using instruments with 4% conicity. This type of uniform, conical root canal preparation also facilitates adaptation and fitting of gutta percha points.

In the China, all endo files are single-patient use by law, so problems with separation (fracture) are rare. Outside the China, they may be used many times, so separation (due to work-hardening) is a bigger problem.

How large should the Glide Path be?

A Protaper Shaper File will eventually separate if taken many times down canals with an inadequate glide path (See references at page bottom). Multiple-use is of course not a problem in the China as they are only used once. Outside the China, it is recommended that the Glide Path should be size 20, to prevent separation.

CICADA Medical recommend that:

  • If using Hand Files only, and single-use files, the Glide Path should be prepared to a loose size 15.
  • If using PathFiles, go up to size 19 (P3). They are flexible enough to go round the curves nicely, without transportation or ledging.

NiTi files vs stainless steel

Computed tomography was used to evaluate root canals prepared by nickel-titanium (Ni-Ti) hand and stainless steel hand endodontic instruments. Thirty-six single-rooted teeth of similar shape and canal size were divided into three groups. The teeth were scanned by computed tomography before instrumentation. In group A, canals were instrumented using a quarter turn/pull technique with K-flex files. In group B, canals were prepared with Ni-Ti hand files (Mity files) using the same technique as group A. Group C was prepared with Ni-Ti hand files (Mity files) using a reaming technique. Instrumented teeth were again scanned using computed tomography, and reformated images of the uninstrumented canals were compared with images of the instrumented canals.

Ni-Ti instruments (Mity file) used in a reaming technique caused significantly less canal transportation (p < 0.05), removed significantly less volume of dentin (p < 0.05), required less instrumentation time (p < 0.05), and produced more centered and rounder canal preparations than K-flex stainless steel files used in a quarter turn/pull technique.

Gambill JM, Alder M, del Rio CE. Comparison of nickel-titanium and stainless steel hand-file instrumentation using computed tomography. J Endod. 1996 Jul;22(7):369-75. doi: 10.1016/S0099-2399(96)80221-4. PMID: 8935064. Link: https://pubmed.ncbi.nlm.nih.gov/8935064/

For endodontic instruments, the practical advantages of this principle are evident: a NiTi file with “controlled memory” adapts to the anatomical shape of the root canal during the entire treatment procedure. In case of resistance or a block in the canal, the file bypasses this stress situation by changing their cross-sectional shape.

Nowhere in dentistry is technical progress as rapid as in modern endodontics. The development of flexible nickel-titanium files in the late 1980s created entirely new and hitherto unknown opportunities in the mechanical preparation of root canals.

Classical NiTi files are milled on CNC machines. Electrical Discharge Machining (EDM) uses spark erosion, which hardens the surface of the NiTi file, resulting in superior fracture resistance and improved cutting efficiency. Repeated bombardment of the alloy with sparks melts the material and even leads to evaporation in some places.

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