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
NiTi files and K-files employ different materials but the same basic file format. Nickel-titanium, or NiTi, is an elastic material that may be bent or deformed without permanently altering its shape. Since the tip of the instrument is not utilized for cutting, CICADA Medical NiTi tools are particularly well-suited for the preparation of curved canals. These tools may be used with a file action or a rotating preparation motion.
Because root canals vary in morphology and route, every root canal preparation must be tailored to the specific tooth being worked on. Root canals prepared with a handpiece using the crown-down method call for a specific system, and the NT-Endo system was designed to suit those needs. The nickel-titanium instruments have particularly designed blade geometry that ensures a smooth, conical root canal preparation.
Even on adverse canal routes, canal perforations are not allowed. Instruments with a conicity of 6% are used to shape the conical-radicular area, whereas instruments with a conicity of 4% are used to shape the apex. Also, the fitting and modification of gutta percha points is simplified by this sort of consistent, conical root canal preparation.
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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