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roots - international magazine of endodontology

I 45 industry report _ NiTi files I roots1_2015 obturation. Like a Phoenix from the ashes, the NiTi file is regenerated by autoclaving and ready for its next application until it reaches the end of its life cycle by clearly displaying an uneven, bent shape. Thefilesareavailablepre-sterilisedfordentistswho prefer working with disposable instruments, espe- cially as endo experts also benefit from the excep- tionalflexibilityandfracturesafetyofHyFlexinsin- gle use. _Practical advantages of modular NiTi systems Looking into the future, the trend is definitely moving towards modular NiTi systems. The advan- tageofsuchvariableinstrumentsetsismainlygiven by their high degree of versatility. The considerable complexityofthehumanrootcanalanatomyalways presentsdentistswithnewchallenges.Hiddenisth- muses and side canals, but also horizontal lateral canals, can quickly turn patient cases into a journey into the unknown, especially as, depending on the typeandpositionofthetooth,theX-rayfindingsdo not always clearly identify all branches. Modular NiTisystemsenableworkingwithconfidenceinvir- tuallyeverysituation.Dependingontheanatomical situation, the dentist can choose between fast in- strumentationwithonlyafewfilesorhighlyprecise canal shaping with a skilful combination of differ- ent NiTi files. _High cutting performance through spark discharge With the HyFlex EDM (COLTENE) the fifth genera- tionofNiTifileshasbeenrecentlypresentedattheIDS 2015. Spark erosion generates a unique, hardened surface,whichimprovescuttingperformanceeven further. Whereas classical NiTi files are traditionally milled on CNC machines, so-called Electrical Dis- charge Machining (EDM for short) processes the workpieces with the aid of electrical discharge. The repeated bombarding of the alloy with sparks melts the material or even leads to evaporation in some places. The result is a file with a distinctly textured surface where heat creates a new surface hardness, which–similartoabreadknifewithserratededge— displaysparticularlygoodcuttingproperties(Fig.6). The result of this innovative process is an un- breakable file, predestined for dentists who wish to realise reliable results quickly with a reduced file sequence. In particular, the HyFlex EDM facilitates working with rotary instruments for ENDO begin- ners: due to their enormous flexibility, the number of files used can be reduced significantly without makingcompromisesinadaptingtothenaturalroot canal anatomy. In simple cases, two files are suffi- cient to clean and efficiently prepare the root canal as with the classical method. All that is required, is a slow speed handpiece which can be operated at up to 500rpm at a recommended torque of up to 2.5Ncm. To prepare a mechanical glide path, the dentist uses a 10/.05 Glidepath file, which is intro- duceduptothefullworkinglengthwithdabbingup and down movements (at 300rpm). As soon as re- sistance is felt, check patency using a 20/.02 hand file. Final preparation in the central and apical area is then performed using the HyFlex EDM 25/.~ One File (400–500rpm), also with gentle dabbing with- out applying pressure and progressing to the full working length (Fig. 7). Due to the high cutting effi- ciency, it is important to only proceed for 1–2mm without applying pressure to clean the file in be- tween and to rinse the canal thoroughly. Optionally, the root canal can be extended coro- nally in advance using the 25/.12 Orifice Opener. In more complex cases, and depending on the clinical situation and the extent of curvature of the canal Fig. 5_’Controlled memory’ effect. Fig. 6_Surface of the HyFlex EDM under the microscope. Fig. 5 Fig. 6

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