![]() Larger sized files tend to be more resistant to these torsional fractures as they don’t bind as easily in those “tight spots”. Excessive force on the file during instrumentation causes the tip of the file to lock in a “tight spot”. Torsional fracture is when the tip of the instrument locks in a canal while the shaft continues to rotate, inevitably leading to fracture (5,6,7). When NiTi files fracture, it is due to cyclic fatigue or torsional strain. ![]() When NiTi rotary is used correctly, it is significantly faster and more efficient in the instrumentation of the root canal (1,2,3,4,10). Flexibility is the hallmark of NiTi rotary, and it is this feature that allows it to overcome one of the greatest challenges of root canal instrumentation, namely following the sharp and unexpected curves in most canals. NiTi files also have high elastic flexibility in bending and torsion as compared with stainless steel files. One of the unique characteristics of NiTi is its ‘shape memory’, allowing it to be deformed during usage and then return to its original shape if it is not stressed beyond its elastic envelope (13). ![]() If however the NiTi file is stressed beyond its elastic limit, it will break (8). This transformation usually happens when the metal is stressed, such as during the instrumentation of the root canal. NiTi is a ‘superelastic’ metallic alloy that, when flexed, undergoes an austenitic-martensitic transformation from its original structure making it extremely flexible (5,17,20,21). To fully understand the positive and negative aspects of this great technology let us first take a closer look at nickel titanium itself. The big disadvantage of this system is sudden file separation within the canal. With every great innovation however, comes a down side and NiTi rotary is no exception. This flexibility allows for navigation of the most complex and curved root canals. The extreme flexibility exhibited by these ‘heat treated’ nickel titanium instruments is the key (1,2,3,4,10). Where navigation of a curved canal with stainless steel instruments might be extremely difficult and time consuming, nickel titanium rotary, when used correctly, can allow for a seamless canal preparation. Stainless steel files became stiffer as the sizes increased. ![]() The beauty of nickel titanium is its flexibility and efficiency. That all changed with the advent of nickel titanium rotary instruments, and a torque controlled motor. This proved to be tedious and quite tiring for the practitioner. There was a time when one would spend multiple visits hand filing a canal with stainless steel instruments. To always achieve control, simplicity and peace of mind, dental professionals count on Kerr Endodontics.There have been few innovations in endodontics as revolutionary as nickel titanium (NiTi) rotary. Our exceptional suite of endodontic rotary files and handpieces includes LightSpeed™ LSX™ Files, Quantec Files, Contra Angles, Hedstrom Files, Reamers and Triple-Flex Files. With the new digital operating interface, changing settings on the TC2 is much easier and more intuitive than previous versions. The auto reverse and alarm functions indicate the load is about to reach the pre-set torque level, allowing you to unload the file even before the auto reverse sets in. Designed to replace the EndoTouch TC, TC2 has a large LCD display, simple 5-key operation and a lightweight, ergonomic design to assure comfort and ease of use during even the most delicate endodontic procedures. Always on the cutting edge, Kerr Dental’s EndoTouch TC2 is the next generation in cordless endodontic motors. With handpieces in latch and push-button design, operation is always smooth and steady, and the intuitive user interface simplifies your experience with an easy to read LCD screen. With six preset recommended settings for TF Adaptive including K3/K3XF, TF, Lightspeed, and M4, you can get to work right away and even customize your settings for optimal performance. It may or may not reciprocate and does not pull into the canal. The Elements Motor adapts the motion based on the amount of pressure on the file. Our TF™ Adaptive NiTi Endo File System provides users with unprecedented flexibility through adaptive motion. Whether it be ISO tapers or orifice openers, stainless steel hand files or rotary Niti files, Kerr Endodontics is your quality solutions provider. Highlighted by our innovative endodontic rotary files: TF, K3XF, and K3 Files, our Shape line provides a wide variety of tools and methods to safely instrument canals. When it comes to endodontic files, rotary files or endo files, Kerr Endodontics meets all your needs.
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