This protocol will greatly reduce the incidence of file breakage. Care must be taken not to force the rotating file into the canal once increased resistance is encountered, the current file should be immediately replaced with another of smaller taper and/or tip diameter. Rotating NiTi instruments are to be used with a slight pecking or “engage-disengage” motion, to minimize strain concentration. The torque-control feedback feature compensates for localized stresses that are placed upon the rotating files and protects instruments from breakage through fatigue or sudden increases in torque. This will free the file from the encountered resistance. When a pre-determined level of resistance is encountered, this motor will switch into auto-reverse mode, rotating the file in a counter-clockwise direction. The authors recommend the use of the Quantec ETM™–electric torque-control motor (Sybron Dental Specialties) that features an auto-reverse capability. Helical Flute Angle – The K3 design has variable helical flute angles that improve the cutting performance and removal of debris. Radial Lands – The K3 design minimizes resistance while maximizing strength to reduce the possibility of fracture (Fig. Rake Angle – The K3 has a slightly positive angle that maximizes cutting efficiency (Fig. Non-cutting tip – Minimizes ledging and transportation (Fig. The characteristics and features of the K3 system are: 02 tapered K3 NiTi rotary files are soon to be launched. 10 taper) and a full set of ISO-sized NiTi rotary files, sizes #15 through 60, in. The K3 system is comprised of two NiTi rotary orifice-openers (.08 and. Computer-assisted innovations in file design in conjunction with sophisticated technique protocols enables safe and predictable clinical results.Ī new and innovative third-generation NiTi rotary system, the K3™ (SybronEndo) was recently introduced to the dental marketplace. Therefore, instruments with a higher degree of fracture resistance as well as safer procedural protocols are warranted. These iatrogenic complications may have a negative influence on the successful outcome of treatment. However, exceeding their torque limits or inappropriate usage may result in sudden file breakage or canal transportation. The super-elasticity and self-centering features of Nickel-Titanium (NiTi) endodontic files has made it possible to instrument moderately and severely curved root canals with relative ease and safety as compared to traditional stainless-steel files. Their clinical use in a maxillary second molar with four canals is described in a step-by-step approach. This case report discusses the clinical use of a 3rd generation NiTi file rotary system that incorporates computer-assisted design characteristics for increased safety and effectiveness. Nickel-Titanium rotary instruments have simplified the endodontic treatment of teeth with moderate to severe canal curvatures.
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